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Browse all 423 Murelio browser utilities across calculators, converters, text, developer, date, finance, health, file, image, generator, design and device-testing categories.

Length Converter — Convert mm, cm, m, km, in, ft, yd, mi, and nautical miles within the same physical quantity of length.
Area Converter — Convert area among mm², cm², m², ha, km², in², ft², and acres.
Volume Converter — Convert volume among mL, L, m³ and US tsp, tbsp, fl oz, cup, pint, and gallon.
Weight Converter — Convert mass among mg, g, kg, metric tonnes, oz, lb, and stone using kilograms as the reference.
Speed Converter — Convert speed among m/s, km/h, mph, knots, and ft/s through an m/s reference.
Temperature Converter — Convert Celsius, Fahrenheit, and kelvin with both scale factors and zero-point offsets.
Time Unit Converter — Convert duration among ms, s, min, h, day, week, and a mean 365.2425-day year.
Pressure Converter — Convert pressure among Pa, kPa, MPa, bar, atm, psi, and mmHg using pascals as the reference.
Energy Converter — Convert energy among J, kJ, cal, kcal, Wh, kWh, and BTU using joules as the reference.
Power Converter — Convert power among W, kW, MW, mechanical hp, metric PS, and BTU/h.
Data Storage Converter — Convert data size among bits, bytes, decimal KB/MB/GB/TB, and binary KiB/MiB/GiB.
Angle Converter — Convert plane angle among degrees, radians, gradians (gon), turns, and arcminutes.
Force Converter — Convert force among N, kN, dyne, kgf, and lbf using the newton as the reference.
Frequency Converter — Convert repetition frequency among Hz, kHz, MHz, GHz, and rpm using hertz as the reference.
Torque Converter — Convert torque among N·m, kN·m, kgf·m, lbf·ft, and lbf·in using N·m as the reference.
Density Converter — Convert density among kg/m³, g/cm³, g/mL, and lb/ft³ using kg/m³ as the reference.
Acceleration Converter — Convert acceleration among m/s², standard gravity g, ft/s², and Gal.
Flow Rate Converter — Convert volumetric flow among L/s, L/min, m³/h, and US gpm using L/s as the reference.
Fuel Economy Converter — Convert fuel economy among km/L, L/100km, US mpg, and UK mpg, including the reciprocal L/100km relationship.
Illuminance Converter — Convert illuminance among lux, foot-candles, phot, and nox using lux as the reference.
Luminance Converter — Convert luminance among cd/m² (nit), foot-lambert, and stilb using cd/m² as the reference.
Dynamic Viscosity Converter — Convert dynamic viscosity among Pa·s, cP, P, and lb/(ft·s) using Pa·s as the reference.
Voltage Converter — Convert voltage among µV, mV, V, and kV using SI decimal prefixes.
Electric Current Converter — Convert electric current among µA, mA, A, and kA with ampere-based SI prefixes.
Resistance Converter — Convert electrical resistance among mΩ, Ω, kΩ, and MΩ using ohms as the reference.
Capacitance Converter — Convert capacitance among pF, nF, µF, mF, and F using farads as the reference.
Electric Charge Converter — Convert electric charge among C, mC, Ah, mAh, and elementary charges e using coulombs as the reference.
Magnetic Flux Converter — Convert magnetic flux among Wb, mWb, and maxwell using the weber as the reference.
Magnetic Field Converter — Convert magnetic flux density among T, mT, µT, and gauss using tesla as the reference.
Radioactivity Converter — Convert radioactive activity among Bq, kBq, MBq, and Ci using becquerels as the reference.
Radiation Dose Converter — Convert absorbed radiation dose among Gy, mGy, and rad using gray as the reference.
Sound Intensity Converter — Convert sound intensity among W/m², mW/m², and µW/m² using W/m² as the reference.
Typography Unit Converter — Convert CSS px, pt, pc, in, cm, and mm using the CSS reference of 96 px per inch.
Print Resolution Converter — Convert print/sample density among dpi, dpcm, and dpm using dots per inch as the reference.
Concentration Converter — Convert dimensionless concentration ratios among %, ‰, ppm, and ppb using percent as the reference.
Molar Mass Converter — Convert molar mass among g/mol, kg/mol, and mg/mol by changing SI prefixes.
Bitrate Converter — Convert bitrate among bps, kbps, Mbps, and Gbps using decimal 1000-based prefixes.
Data Transfer Rate Converter — Convert byte-based transfer rate among B/s, KB/s, MB/s, and GB/s with decimal 1000-based prefixes.
Permeability Converter — Convert intrinsic permeability of porous media among m², darcy, and millidarcy.
Surface Tension Converter — Convert surface tension among N/m, dyn/cm, and mN/m using N/m as the reference.
Thermal Conductivity Converter — Convert thermal conductivity between W/(m·K) and BTU/(h·ft·°F) using the SI value as reference.
Heat Capacity Converter — Convert heat capacity among J/K, kJ/K, and BTU/°F using J/K as the reference.
Entropy Converter — Convert entropy or entropy-change units among J/K, kJ/K, and cal/K using J/K as the reference.
Linear Charge Density Converter — Convert linear charge density among C/m, µC/m, and nC/m using C/m as the reference.
Mass Flow Rate Converter — Convert mass flow rate among kg/s, kg/min, t/h, and lb/min using kg/s as the reference.
Momentum Converter — Convert momentum/impulse-dimension values among kg·m/s, N·s, and lb·ft/s.
Dynamic Range Converter — Convert between decibels, amplitude/voltage ratio, and power/intensity ratio with their logarithmic relationships.
Percentage Calculator — Calculate what percentage one value represents of a total.
Percentage Change Calculator — Measure the percent increase or decrease from a baseline to a new value.
Percentage Difference Calculator — Compare two values symmetrically as a percentage of their mean.
Ratio Calculator — Calculate the ratio of two values as the first value divided by the second.
Average Calculator — Calculate the mean and basic statistics for a list of numbers separated by commas, spaces, or new lines.
Weighted Average Calculator — Calculate a weighted mean from multiple value-and-weight pairs.
Square Root Calculator — Calculate the real principal square root of a non-negative number and show a square check.
Cube Root Calculator — Calculate the real cube root of positive or negative numbers.
Power Calculator — Raise a base to an exponent and return a finite real result.
Logarithm Calculator — Calculate a logarithm using a user-specified base.
Factorial Calculator — Calculate n! exactly as a large integer for n from 0 through 5000.
Modulo Calculator — Calculate a quotient truncated toward zero and its division remainder.
Scientific Notation Calculator — Convert a finite number to coefficient × 10^exponent and E notation.
Absolute Value Calculator — Return the absolute value of a real number, its distance from zero.
Quadratic Discriminant — Calculate the discriminant b²−4ac for the quadratic ax²+bx+c.
Arithmetic Sequence Term — Find the nth term of an arithmetic sequence from its first term and common difference.
Geometric Sequence Term — Find the nth term of a geometric sequence from its first term and common ratio.
Arithmetic Series Sum — Calculate the sum of the first n terms of an arithmetic sequence.
Geometric Series Sum — Calculate the sum of the first n terms of a geometric sequence.
2D Distance Calculator — Calculate straight-line Euclidean distance between two points in a plane.
Midpoint Calculator — Calculate the midpoint of two 2D points and their straight-line distance.
Slope Calculator — Calculate the slope Δy/Δx of the line through two points.
Circle Area Calculator — Calculate a circle's area from its radius using πr².
Circle Circumference Calculator — Calculate a circle's circumference from its radius using 2πr.
Sector Area Calculator — Calculate the area of a circular sector from radius and central angle in degrees.
Triangle Area Calculator — Calculate triangle area from a base and its perpendicular height.
Heron Triangle Area — Use Heron's formula to calculate triangle area from three side lengths.
Rectangle Area Calculator — Calculate rectangle area by multiplying width and length.
Rectangle Perimeter Calculator — Calculate the total perimeter of a rectangle from width and length.
Square Area Calculator — Calculate square area from one side length.
Trapezoid Area Calculator — Calculate trapezoid area from two parallel sides and perpendicular height.
Parallelogram Area Calculator — Calculate parallelogram area from a base and its perpendicular height.
Ellipse Area Calculator — Calculate ellipse area from its two semi-axis lengths using πab.
Cube Volume Calculator — Calculate cube volume as the third power of one side length.
Rectangular Prism Volume — Calculate rectangular-box volume by multiplying width, length, and height.
Sphere Volume Calculator — Calculate sphere volume from radius using 4πr³/3.
Sphere Surface Area — Calculate the total surface area of a sphere from radius.
Cylinder Volume Calculator — Calculate cylinder volume from radius and height using πr²h.
Cone Volume Calculator — Calculate cone volume from base radius and perpendicular height.
Pyramid Volume Calculator — Calculate pyramid volume from base area and perpendicular height.
Pythagorean Theorem Calculator — Calculate a right triangle's hypotenuse from its two perpendicular legs.
Law of Cosines Calculator — Use the law of cosines to find a third side from two sides and their included angle.
Degrees to Slope — Convert an angle in degrees to slope percent.
Ohm's Law Voltage — Use Ohm's law to calculate voltage from current and resistance.
Ohm's Law Current — Use Ohm's law to calculate current from voltage and resistance.
Ohm's Law Resistance — Use voltage and current to calculate resistance R=V/I.
Electric Power Calculator — Calculate electrical power as voltage multiplied by current.
Kinetic Energy Calculator — Calculate translational kinetic energy from mass and speed.
Potential Energy Calculator — Calculate near-Earth gravitational potential energy mgh.
Force Calculator — Calculate net force from mass and acceleration using Newton's second law.
Momentum Calculator — Calculate linear momentum as mass times velocity.
Wave Speed Calculator — Calculate wave speed from frequency and wavelength using v=fλ.
Simple Interest Calculator — Calculate simple interest and ending amount from principal, annual rate, and term.
Compound Interest Calculator — Simulate compound growth from initial balance, monthly contributions, term, nominal annual rate, and compounding frequency.
Savings Goal Calculator — Back-solve the monthly contribution required to reach a savings target.
Loan Payment Calculator — Calculate a level monthly loan payment from principal, annual rate, and number of months.
Mortgage Payment Calculator — Calculate a monthly mortgage principal-and-interest payment from loan amount, annual rate, and years.
APR Calculator — Convert a monthly percentage rate to a simple nominal annual rate by multiplying by 12.
Discount Calculator — Calculate original total, savings, and discounted total from price, discount, and quantity.
Markup Calculator — Calculate selling price, markup amount, and selling-price margin from cost and markup percentage.
Profit Margin Calculator — Calculate profit and profit margin from revenue and cost.
Sales Tax Calculator — Add a percentage sales tax to a pre-tax price.
VAT Calculator — Calculate VAT amount from a price treated as pre-VAT and a VAT percentage.
Tip Calculator — Calculate tip, total with tip, and per-person amounts from bill, tip rate, and party size.
Bill Split Calculator — Split a total bill evenly across people with an optional tip rate.
Break-even Calculator — Calculate break-even unit volume from fixed costs, selling price per unit, and variable cost per unit.
ROI Calculator — Calculate simple return on investment and profit from cost and returned value/revenue.
ROAS Calculator — Calculate return on ad spend from attributed revenue and advertising cost.
CAGR Calculator — Calculate compound annual growth rate from starting value, ending value, and years.
Inflation Calculator — Project a constant-inflation scenario for future price and purchasing-power equivalent.
Real Interest Rate — Calculate real interest rate from nominal rate and inflation with the Fisher relation.
Currency Gain Calculator — Calculate currency gain/loss from quantity, buy rate, sell rate, and transaction fees handled by the special runner.
Unit Price Calculator — Calculate unit price and, in the special runner, compare two products.
Cost Per Click Calculator — Calculate average cost per click from ad cost and click count.
CAC Calculator — Calculate customer acquisition cost from multiple acquisition-cost components and new customers.
Customer Lifetime Value — Estimate simple revenue-based customer lifetime value from average transaction, purchase frequency, and customer years.
Inventory Turnover — Calculate inventory turnover from cost of goods sold and average inventory.
Straight-line Depreciation — Calculate annual straight-line depreciation from asset cost, salvage value, and useful life.
BMI Calculator — Calculate BMI and CDC adult BMI category for people age 20 and older.
Ideal Weight Calculator — Compare four classic ideal-body-weight reference equations: Devine, Robinson, Miller, and Hamwi.
Body Fat Estimate — Estimate body-fat percentage with the U.S. Navy circumference equations using height, neck, waist, and reference sex.
BMR Calculator — Estimate basal metabolic rate with the Mifflin–St Jeor equation from reference sex, age, weight, and height.
TDEE Calculator — Estimate total daily energy expenditure by multiplying Mifflin–St Jeor BMR by a selected activity factor.
Calorie Deficit Calculator — Compare maintenance calories with intake as daily and seven-day energy difference.
Water Intake Calculator — Convert the NHS general 6–8 cups/glasses hydration guide into counts of your cup or bottle.
Protein Intake Calculator — Convert a chosen protein target in g/kg/day into grams per day from body weight.
Running Pace Calculator — Calculate average running pace and speed in both kilometre and mile units from distance and elapsed time.
Running Speed Calculator — Calculate average running speed in km/h or mph from distance and elapsed time.
Heart Rate Zone Calculator — Calculate age-predicted maximum heart rate and general moderate/vigorous target zones for adults.
Maximum Heart Rate — Show an age-predicted maximum heart-rate reference using about 220−age plus general intensity bands.
Waist-to-Height Ratio — Calculate waist-to-height ratio and the NICE adult bands implemented by the runner.
Body Surface Area — Calculate body surface area with Mosteller or Du Bois and compare both results.
Pregnancy Weight Gain Guide — Show CDC total pregnancy weight-gain reference ranges in kilograms from pre-pregnancy BMI and singleton/twin status.
Sleep Cycle Calculator — Back-calculate three bedtime options from a target wake time using 4, 5, or 6×90-minute cycles plus sleep-onset time.
Caffeine Half-life Calculator — Model caffeine remaining after elapsed time using an initial amount and a user-chosen half-life.
Alcohol Unit Calculator — Calculate UK alcohol units, pure-alcohol millilitres, and approximate grams from drink volume and ABV.
Carbohydrate Ratio — Apply the 500 rule to total daily insulin dose (TDD) to estimate a starting grams-of-carbohydrate-per-unit ratio.
Lean Body Mass Estimate — Compare Boer, James, and Hume lean-body-mass estimates from reference sex, weight, and height.
Surface Area to Volume — Calculate a cube's surface-area-to-volume ratio as 6/s.
PPM Solution Calculator — Calculate parts per million as solute amount divided by total amount times one million.
Molarity Calculator — Calculate molarity from moles of solute and final solution volume.
Dilution Calculator — Calculate required final volume for a dilution using C1V1=C2V2.
Reynolds Number — Calculate Reynolds number from density, velocity, characteristic length, and dynamic viscosity.
Gear Ratio Calculator — Calculate a simple gear ratio from driven teeth divided by driver teeth.
Mechanical Advantage — Calculate actual mechanical advantage as output force divided by input force.
Compression Ratio — Calculate geometric compression ratio from swept and clearance volumes.
Aspect Ratio Width — Calculate width from height and a width:height aspect ratio.
Pixel Density Calculator — Calculate display pixels per inch from resolution and diagonal size.
Download Time Calculator — Estimate theoretical download time from file size and transfer speed.
Bandwidth Calculator — Calculate the average data rate required to move a given data size within a target time.
Meeting Cost Calculator — Calculate direct meeting labor cost from attendee count, meeting minutes, and hourly cost.
Freelance Rate Calculator — Estimate a required freelance hourly rate from target income, annual business costs, and billable time.
Salary to Hourly Calculator — Convert gross annual salary to hourly, daily, weekly, and monthly equivalents using work schedule assumptions.
Hourly to Salary Calculator — Convert an hourly rate to annual, monthly, weekly, and daily gross-pay equivalents.
Commission Calculator — Calculate a commission amount as a percentage of a base sales or contract amount.
Royalty Calculator — Calculate a royalty amount as a single percentage of the entered revenue base.
Volumetric Weight — Calculate volumetric shipping weight with the catalog's divisor-5000 formula.
Fuel Cost Calculator — Estimate fuel use and cost from trip distance, fuel-economy mode, and fuel price.
Travel Budget Calculator — Combine people, trip days, per-person daily cost, and fixed costs into a travel budget.
Electricity Cost Calculator — Estimate electricity energy use and cost from device watts, hours/day, days, and price per kWh.
Paint Calculator — Estimate paint litres from rectangular wall area, coat count, product coverage, and waste allowance.
Tile Calculator — Estimate whole tile count from a rectangular surface, tile size, and waste allowance.
Concrete Volume Calculator — Calculate rectangular concrete volume from width, length, and thickness/height.
Stair Riser Calculator — Calculate basic stair dimensions from floor-to-floor rise, target riser height, and tread depth.
Roof Pitch Calculator — Calculate roof angle and percent grade from vertical rise and horizontal run.
Garden Soil Calculator — Calculate soil volume for a rectangular garden bed from width, length, and depth.
Word Counter — Count words together with character, line, sentence, and paragraph statistics.
Character Counter — Count Unicode code points, non-whitespace characters, and UTF-8 bytes.
Line Counter — Count lines separated by LF or CRLF newline characters.
Sentence Counter — Estimate sentence count from sentence-ending punctuation followed by whitespace.
Paragraph Counter — Count non-empty paragraphs separated by blank lines.
Reading Time Calculator — Estimate reading duration from word count and a configurable words-per-minute rate.
Speaking Time Calculator — Estimate speaking duration from script word count and a configurable WPM rate.
Uppercase Converter — Convert input text to locale-aware uppercase.
Lowercase Converter — Convert input text to locale-aware lowercase.
Title Case Converter — Create a simple title case by capitalizing the first character of every parsed token.
Sentence Case Converter — Lowercase the whole input, then capitalize the first letter at the start and after recognized sentence punctuation plus whitespace.
camelCase Converter — Join parsed words into camelCase with a lowercase first token and capitalized subsequent tokens.
PascalCase Converter — Create PascalCase by capitalizing every parsed word and joining without separators.
snake_case Converter — Normalize parsed words to lowercase and join them with underscores as snake_case.
kebab-case Converter — Create kebab-case by lowercasing parsed words and joining them with hyphens.
CONSTANT_CASE Converter — Create CONSTANT_CASE by uppercasing parsed words and joining them with underscores.
Alternating Case — Alternate lowercase and uppercase according to each code-point position.
Reverse Text — Reverse the order of Unicode code points in the text.
Reverse Word Order — Reverse the sequence produced by splitting text into words and captured whitespace chunks.
Sort Lines — Sort lines ascending or descending with options for natural numeric order, case sensitivity, deduplication, and trimming.
Shuffle Lines — Shuffle the order of input lines using browser cryptographic random values.
Remove Duplicate Lines — Remove exact duplicate lines while preserving the first occurrence order.
Duplicate Line Finder — Find lines that occur more than once and report their occurrence counts.
Trim Lines — Trim leading and trailing whitespace from every line while preserving the line structure.
Remove Empty Lines — Remove empty or whitespace-only lines while keeping all non-empty line text.
Collapse Whitespace — Collapse runs of spaces or tabs to one space and reduce three or more consecutive newlines to two.
Remove Spaces — Remove every JavaScript whitespace character matched by \s.
Tabs to Spaces — Replace every tab character with a user-selected 1-to-16 number of spaces.
Spaces to Tabs — Convert fixed-width groups of leading indentation spaces into tabs.
Add Line Numbers — Prefix every line with a one-based 'number. ' label.
Remove Line Numbers — Remove common numeric line-number prefixes from the start of each line.
Prefix Every Line — Prepend the exact user-supplied string to every line.
Suffix Every Line — Append the exact user-supplied string to every line.
Quote Lines — Wrap every line in double quotes and backslash-escape any existing double quote inside the line.
Comma List to Lines — Turn a comma-separated list into one item per line.
Lines to Comma List — Join non-empty lines with ', ' to create a single comma list.
CSV Column Extractor — Extract a zero-based column from each line using simple comma splitting.
Find and Replace — Replace every exact literal occurrence of a search string with a replacement string.
Regex Tester — Test an ECMAScript regular expression and inspect every match, position, and capture group.
Regex Replace — Replace text globally with an ECMAScript regular expression and a supplied replacement string.
Text Difference Checker — Compare two texts with a line-based LCS diff that aligns added, removed, and unchanged lines.
Anagram Checker — Check whether two inputs are anagrams after lowercasing and keeping only letters and digits.
Palindrome Checker — Check whether the letters and digits read the same forward and backward after ignoring case and punctuation.
Keyword Density Checker — Calculate the percentage of all parsed words that exactly equal one chosen keyword.
Letter Frequency Analyzer — Count letter and digit code points case-insensitively and list them by descending frequency.
Word Frequency Analyzer — Count parsed words case-insensitively and list them in descending occurrence frequency.
N-gram Generator — Generate overlapping word N-grams by grouping each consecutive run of N parsed words.
Syllable Estimator — Estimate syllables by counting runs of English vowel letters a,e,i,o,u,y in each word.
Readability Score — Calculate Flesch Reading Ease from word, sentence, and estimated syllable counts.
Remove Punctuation — Remove all Unicode punctuation and symbol characters, leaving other text such as letters, digits, and whitespace.
Extract Numbers — Extract integer or decimal-looking substrings with optional plus or minus signs, one per line.
Extract Email Addresses — Extract email-address candidates matching a common [email protected] shape.
Extract URLs — Extract URL candidates that explicitly start with http:// or https://.
Extract Hashtags — Extract hashtags made of # followed by Unicode letters, numbers, or underscores.
Extract Mentions — Extract mention candidates made of @ followed by Unicode letters, numbers, or underscores.
Remove HTML Tags — Parse HTML with the browser DOMParser and return only body.textContent, effectively removing markup.
HTML to Plain Text — Parse HTML and extract the body text-node content as plain text.
Markdown to Plain Text — Strip common Markdown image, link, list, and emphasis markers with a set of simple regular expressions.
Slug Generator — Create a slug by NFKD-normalizing and lowercasing text, then replacing non-letter-or-digit runs with hyphens.
Filename Sanitizer — Sanitize a filename by replacing control and Windows-forbidden characters, trimming trailing dots/spaces, and limiting length.
Zero-width Character Cleaner — Remove U+200B through U+200D and U+FEFF zero-width/BOM-related characters from text.
Unicode Normalizer — Normalize text to one of NFC, NFD, NFKC, or NFKD.
Smart Quote Converter — Convert simple same-line pairs of straight double or single quotes into typographic smart quotes.
Fullwidth to Halfwidth — Convert fullwidth ASCII-range characters and ideographic space to halfwidth ASCII and ordinary space.
Hangul Jamo Inspector — NFD-decompose the input and list every resulting code point with its U+ hexadecimal value.
Roman Numeral Converter — Convert integers 1–3999 to Roman numerals or interpret Roman-letter input as an integer.
Morse Code Translator — Encode Latin letters a–z and digits 0–9 as Morse code, or decode dot-dash input back to text.
Binary Text Converter — Encode text as UTF-8 bytes and display each byte as an eight-bit binary group.
Text to ASCII Codes — List the decimal Unicode code point of every input character.
ASCII Codes to Text — Convert valid Unicode code-point integers separated by spaces or commas into characters.
NATO Phonetic Alphabet — Convert Latin letters a–z to NATO phonetic-alphabet words while leaving other characters unchanged.
Emoji Remover — Remove code points matching the Unicode Extended_Pictographic property.
Emoji Counter — Count code points matching the Unicode Extended_Pictographic property.
Invisible Character Viewer — Visualize selected invisible characters by replacing spaces, tabs, newlines, ZWSP, and NBSP with visible markers.
Text Statistics — Summarize characters, UTF-8 bytes, words, unique words, sentences, lines, and estimated reading minutes in one table.
JSON Formatter — Parse JSON and serialize it again with two-space indentation.
JSON Minifier — Parse valid JSON and reserialize it without formatting whitespace.
JSON Validator — Check whether the input can be parsed by JavaScript JSON.parse.
JSON Path Explorer — Query one JSON value using dot notation, array indexes, and quoted keys.
JSON to CSV — Convert an array of JSON objects into CSV-like text using the union of all object keys as columns.
CSV to JSON — Convert CSV text to a JSON object array using the header row as property names.
YAML to JSON — Parse YAML with the yaml package and serialize the resulting value as two-space JSON.
JSON to YAML — Parse valid JSON and generate YAML with the yaml package's YAML.stringify.
XML Formatter — Validate XML with the browser XML parser and insert line breaks between adjacent tags.
XML Minifier — Remove whitespace between XML tags and trim the surrounding text for a compact form.
XML Validator — Parse XML with DOMParser and check whether a parsererror node is produced.
XML to JSON — Recursively convert an XML element tree into a simple JSON object keyed by tag names.
HTML Formatter — Format HTML with Prettier standalone's html parser.
CSS Formatter — Format CSS with Prettier standalone and the PostCSS parser plugin.
JavaScript Formatter — Format JavaScript with Prettier standalone's Babel parser.
TypeScript Formatter — Format TypeScript with Prettier standalone's TypeScript parser.
SQL Formatter — Lightly format SQL by collapsing whitespace and inserting line breaks before selected keywords.
Base64 Encoder — Encode text as UTF-8 bytes and then convert those bytes to Base64.
Base64 Decoder — Decode standard Base64 bytes and interpret them as UTF-8 text.
URL Encoder — Percent-encode text using JavaScript encodeURIComponent rules for a URL component.
URL Decoder — Decode a percent-encoded URL component with JavaScript decodeURIComponent.
HTML Entity Encoder — Escape text for HTML text content by assigning it to a DOM element's textContent and reading innerHTML.
HTML Entity Decoder — Decode HTML entities by assigning the input to a textarea's innerHTML and reading its value.
Unicode Escape Converter — Convert each Unicode code point into a JavaScript-style Unicode escape string.
Hex Encoder — Encode text as UTF-8 bytes and concatenate each byte as two lowercase hexadecimal digits.
Hex Decoder — Validate hexadecimal byte text, convert it to bytes, and decode those bytes as UTF-8.
Gzip Size Estimator — Compress the input text with the browser CompressionStream gzip implementation and report the resulting byte size.
JWT Decoder — Decode the Base64URL header and payload of a three-part JWS JWT and display common time claims readably.
UUID Validator — Check whether a string matches the 8-4-4-4-12 hexadecimal UUID shape with supported version and variant bits.
IP Address Validator — Strictly parse an IPv4 or IPv6 address and show a normalized representation when valid.
CIDR Subnet Calculator — Calculate network, subnet mask, broadcast, first/last usable addresses, and address counts from IPv4/CIDR input.
IPv4 to Integer — Convert a valid IPv4 address to its 32-bit unsigned integer value.
Integer to IPv4 — Convert an integer from 0 to 4294967295 into a network-order dotted IPv4 address.
MAC Address Formatter — Extract the twelve hexadecimal digits of a MAC address and reformat them as six two-digit groups with a chosen separator.
HTTP Status Lookup — Look up a typed HTTP status code in the tool's built-in set of common reason phrases.
MIME Type Lookup — Look up a file extension in a built-in map of common MIME types.
User Agent Parser — Heuristically infer browser, version, OS, device class, engine, and bot status from a User-Agent string.
URL Parser — Parse a URL with the browser URL API and display protocol, host, hostname, port, pathname, search, hash, and username as JSON.
Query String Parser — Parse a full URL or query string with URLSearchParams and show both original parameter order and grouped JSON values.
Cron Expression Explainer — Validate a standard five-field cron expression, show its fields, and calculate up to five upcoming runs in the browser time zone.
Unix Permission Calculator — Convert Unix permissions between three-digit octal and nine-character rwx notation.
Semantic Version Compare — Parse and compare two Semantic Versions using SemVer 2.0.0 precedence rules.
Design Token Generator — Generate a small CSS custom-property token block containing a chosen primary color.
CSS Unit Converter — Convert px and rem in either direction using a user-specified root font size.
Data URI Generator — Build a text data: URL using a chosen MIME type, charset, and either percent encoding or Base64.
Text Hash Generator — Hash the UTF-8 bytes of input text with Web Crypto and return a lowercase hexadecimal digest.
HMAC Generator — Create an HMAC signature from a message and secret key with Web Crypto and display it as hexadecimal.
Checksum Calculator — Apply a selected SHA digest to text and return a hexadecimal value for checksum-style comparison.
SQL IN List Builder — Turn newline- or comma-separated values into SQL IN (...) literal syntax.
JSON Schema Generator — Infer a starter JSON Schema recursively from the observed types and nested structure of a JSON sample.
UUID v4 Generator — Generate one UUID v4 with the browser's crypto.randomUUID().
Bulk UUID Generator — Generate 1 to 100 UUID v4 values at once, one per line.
ULID Generator — Generate a 26-character ULID-shaped identifier from the current implementation's time prefix and random suffix.
Random Number Generator — Generate 1–100 random integers inside a chosen inclusive range using cryptographic random values.
Random Integer Generator — Generate one Web-Crypto-backed integer between a minimum and maximum.
Random Decimal Generator — Generate 1–100 Web-Crypto-backed decimal values in a range with 0–12 displayed decimal places.
Coin Flip — Return Heads or Tails from one two-way Web Crypto random choice.
Dice Roller — Roll 1–100 dice with 2–1000 sides and show every roll plus the total.
Secure Password Generator — Generate 1–50 passwords of 4–128 characters from selected lowercase, uppercase, number, and symbol sets.
Passphrase Generator — Generate a hyphen-separated passphrase from the built-in pool of 25 English words.
PIN Code Generator — Generate a numeric PIN string of at least four digits using Web Crypto-backed digit choices.
Secure Token Generator — Generate a minimum-16-character hexadecimal token from Web Crypto random bytes.
API Key Generator — Generate a minimum-16-character hexadecimal API-key-shaped string from Web Crypto randomness.
Random Bytes Generator — Generate the requested number of Web Crypto random bytes and display them as two hex characters per byte.
Random Hex Color — Generate a random 24-bit RGB color as six-digit #RRGGBB hex.
Random RGB Color — Generate a CSS rgb(r g b) string from three independently random 0–255 channels.
Random Gradient Generator — Generate a CSS linear-gradient from a random 0–359 degree angle and two random hex colors.
Lorem Ipsum Generator — Generate a placeholder sentence of at least ten words by randomly picking from a built-in English word pool.
Placeholder Text Generator — Create placeholder copy of a requested 5–500 character length by repeating a built-in sentence.
Random Name Picker — Pick one item from a user-editable name list using Web Crypto randomness.
Random Team Generator — Shuffle two or more candidates and distribute them round-robin into two or more teams.
Random Decision Maker — Pick one option from a user-entered decision list using Web Crypto randomness.
Yes or No Generator — Return either Yes or No from one two-way Web Crypto random choice.
Random Quote Picker — Randomly pick one phrase from a user-entered quote or text list.
Username Generator — Generate 1–100 username candidates from a base name, separator, and random 0000–9999 suffix.
Email Alias Generator — Create a plus-address alias string by appending +randomword to the local part of a base email.
Random Date Generator — Generate 1–100 random dates between a start-day 00:00 and end-day 23:59:59.999.
Random Timestamp Generator — Generate 1–100 random instants in a date range as Unix milliseconds, Unix seconds, or ISO 8601.
Sample Address Generator — Generate an obviously synthetic address in a 'Street, Sample City' form from a random house number and built-in word.
Sample Data Generator — Generate 1–100 JSON sample objects containing id, name, active, and score fields.
Sample CSV Generator — Generate 1–100 CSV sample rows with id, name, and value columns.
Sample JSON Generator — Generate a simple 1–100 item JSON array with id, name, and value fields.
Barcode Value Generator — Generate 1–100 EAN-13 or UPC-A numeric values with check digits, or a restricted-character payload for Code 128.
OTP Secret Generator — Generate 1–50 OTP secret candidates by Base32-encoding 10–64 Web Crypto random bytes.
Nonce Generator — Generate a minimum-16-character hexadecimal nonce from Web Crypto randomness.
Age Calculator — Compare a date of birth with a reference date to calculate exact age, year-count age, elapsed time, and time until the next birthday.
Date Difference Calculator — Calculate the absolute calendar-day gap between two dates together with direction, weeks, and weekday count.
Days Between Dates — Quickly calculate elapsed calendar days between two dates and review equivalent weeks and hours.
Business Days Calculator — Count weekdays between two dates by excluding Saturdays and Sundays.
Add Days to Date — Add a specified number of calendar days to a selected date and return the resulting date and weekday.
Subtract Days from Date — Subtract a specified number of calendar days from a selected date to find the earlier date and weekday.
Week Number Calculator — Calculate the ISO week-numbering year and week for a calendar date.
Day of Year — Find the 1-based day number of a date within its year, from 1 through 365 or 366.
Day of Week Finder — Find the weekday for a selected calendar date with localized weekday names.
Leap Year Checker — Determine whether a year is a Gregorian leap year and show whether it contains 365 or 366 days.
Unix Timestamp Converter — Convert a Unix timestamp into a date and compare ISO 8601, seconds, milliseconds, and device-local time.
ISO Date Converter — Convert a device-local date and time into a UTC ISO 8601 string and Unix timestamps.
Timezone Offset Calculator — Get the UTC/GMT offset for a selected instant in one of the provided IANA time zones.
World Time Converter — Display a device-local date and time as the corresponding date and time in a selected world time zone.
Countdown Timer — Run a 1-999 minute countdown with start, pause, resume, reset, and a short completion sound.
Stopwatch — Measure elapsed time with a monotonic browser clock, centisecond display, and lap capture.
Pomodoro Timer — Run a configurable focus/break Pomodoro sequence through the final focus round.
Interval Timer — Repeat configurable work and rest intervals for a selected number of rounds.
Metronome — Play a browser metronome from 30-240 BPM with an accent on the first beat of a repeating four-beat cycle.
Calendar Generator — Generate a Sunday-first monthly calendar for a chosen year and month with today's date highlighted.
Quarter Calculator — Determine whether a date falls in calendar quarter Q1, Q2, Q3, or Q4.
Fiscal Year Calculator — Assign a date to a fiscal-year ending-year label using a selectable fiscal start month.
Moon Age Estimate — Estimate lunar phase, moon age, and illumination for a date using a mean synodic-month model.
Time Duration Calculator — Break the actual millisecond difference between two local date-times into days, hours, minutes, seconds, and total seconds.
Decimal Time Converter — Convert an hh:mm:ss clock time into decimal hours and show equivalent total minutes and seconds.
Color Converter — Convert a HEX color into useful RGB/HSL-style representations and suggest a readable on-color.
Color Picker — Pick a color by HEX input, browser EyeDropper, or recent colors and preview related harmony swatches.
Palette Generator — Generate either a role-based harmony palette or a stepped scale from one HEX color.
Contrast Checker — Calculate foreground/background relative-luminance contrast and show WCAG AA/AAA pass states.
CSS Gradient Generator — Build a three-color CSS linear-gradient from HEX colors, angle, and middle-stop position.
Color Shades Generator — Generate a requested number of progressively darker shades from one base color.
Color Tints Generator — Generate a requested number of progressively lighter tints from one base color.
Complementary Color — Generate a complementary pair by moving the base color's HSL hue about 180 degrees around the color wheel.
Analogous Colors — Generate 3–7 analogous harmony colors around a narrow hue range near the base.
Triadic Colors — Generate a triadic harmony of three colors spaced 120 degrees apart in hue.
Color Blender — Linearly mix two HEX colors at a 0–100% ratio and calculate the intermediate color.
Color Temperature Preview — Convert a Kelvin value to an approximate RGB/HEX preview color.
Box Shadow Generator — Build a CSS box-shadow from X/Y offsets, blur, spread, opacity, inset, and color controls.
Text Shadow Generator — Generate CSS text-shadow from X/Y offsets, blur, and color.
Border Radius Generator — Set four corner radii in px or % and generate the CSS border-radius shorthand.
Glassmorphism Generator — Generate glassmorphism CSS combining translucent white, backdrop blur, border, shadow, and radius.
Neumorphism Generator — Generate flat, concave, or convex neumorphism CSS from a base color and paired light/dark shadows.
CSS Grid Generator — Generate a basic CSS Grid container from column count, row count, and gap.
CSS Flexbox Generator — Generate a CSS Flexbox container from direction, justify-content, align-items, and gap controls.
SVG Wave Generator — Generate an SVG wave background from two colors, height, curve, reverse, and layer count, with file download.
File Hash Calculator — Compute a SHA digest of the selected file bytes with browser Web Crypto.
File Checksum — Create a re-check checksum by applying a selected SHA algorithm to the entire file.
File Information — Display the filename, MIME type, byte size, and last-modified time exposed by the selected File object.
File to Base64 — Encode every byte of the selected file as a standard Base64 string.
Base64 to File — Decode raw Base64 or a base64 Data URI into a downloadable Blob.
Text File Viewer — Read a text-like file in the browser and display its leading content as plain text.
CSV Viewer — Read CSV/TSV-style files as a table and filter rows by text found in any cell.
JSON File Viewer — Parse a JSON file and display it again with two-space indentation.
ZIP Contents Viewer — Open a ZIP archive in the browser and list each entry name with its uncompressed byte size.
ZIP Creator — Bundle multiple local files into one level-6 ZIP archive for download.
PDF Page Counter — Read a PDF and display only the number of pages in the document.
PDF Metadata Viewer — Display a PDF's page count plus Title, Author, Subject, Creator, and Producer metadata fields.
PDF Merger — Merge every page from two or more PDFs into merged.pdf in the user-defined file order.
PDF Splitter — Copy selected pages from one PDF into a new downloadable PDF.
PDF Page Reorder — Rearrange every page of one PDF by drag or up/down buttons and create a new PDF in that order.
Image Information — Inspect an image's pixel width and height, MIME type, and file size in the browser.
Image Resizer — Redraw an image to a chosen pixel width and height on canvas and export a new file.
Image Crop Editor — Crop only a dragged or manually entered X/Y/width/height region and save it as PNG.
Image Rotator — Rotate an image by 90°, 180°, or 270° and export it as PNG.
Image Flipper — Flip an image horizontally or vertically and save the result as PNG.
Image Compressor — Re-encode an image at unchanged dimensions as JPEG or WebP and use quality to trade file size against visual fidelity.
Image Format Converter — Re-encode an image on canvas as WebP, JPEG, or PNG.
Image Data URL Generator — Redraw an image on canvas and convert it to a PNG Data URL string.
Audio Information — Open an audio file with a browser audio element and report duration, MIME type, and file size.
Video Information — Read video duration, intrinsic width×height, MIME type, and file size from browser video metadata.
Scientific Calculator — Evaluate mathjs expressions in DEG or RAD mode and keep up to 20 recent results.
Analog Clock — Show the browser's current local time with analog hands and a digital time, refreshed once per second.
Typing Speed Test — Time a fixed localized sentence and calculate WPM, character accuracy, and elapsed time.
Reaction Time Test — Measure milliseconds from a randomly delayed visual signal until the user's tap.
Click Speed Test — Count clicks during an explicitly started five-second window and calculate CPS.
Keyboard Tester — Show up to 12 recent keydown events with key, code, modifiers, and repeat state in a focused test area.
Mouse Tester — Display mouse pointer position, buttons bitmask, pressure, and pointer type in a test area.
Touchscreen Tester — Use Pointer Events to display active contact position/pressure plus maximum simultaneous contacts and event count.
Gamepad Tester — Read the first connected pad's ID, mapping, buttons, and axes through Gamepad API, with haptics testing when exposed.
Screen Information — Display screen size, devicePixelRatio, viewport size, and color depth exposed by the current browser.
On-screen Pixel Ruler — Render a horizontal CSS-based ruler with labels from 0 to 200 in steps of 10.
Microphone Tester — Display live input level and peak from a selected microphone using Web Audio.
Speaker Tester — Play a 20–20000 Hz Web Audio test tone with adjustable volume, duration, and stereo pan.
Webcam Tester — Open a selected camera with getUserMedia and show a live preview plus negotiated track settings.
Vibration Tester — Request a user-defined millisecond vibration/pause pattern through the Web Vibration API when supported.
Device Orientation Viewer — Display DeviceOrientationEvent alpha, beta, and gamma angles live and request sensor access where the platform requires it.
Random Wheel — Choose one of 2–20 user entries with Web Crypto randomness and show it through an SVG wheel spin.
Ladder Game — Create a random bridge ladder for 2–10 players and the same number of results, then reveal the assignments.
Bingo Card Generator — Generate a 5×5 bingo card by taking five numbers from each standard 15-number B/I/N/G/O column range and track marked cells.
Memory Match Game — Play a memory-matching game with 4, 6, 8, or 10 symbol pairs shuffled in the browser.