All tools
Every tool, alphabetical.
Calculators
Age Calculator
Calculate your exact age in years, months, days and seconds.
BMI Calculator
Calculate your Body Mass Index in metric or imperial units.
Compound Interest Calculator
Project savings growth with compound interest and monthly contributions.
Date Calculator
Days between dates, add or subtract days, business-day count.
Discount Calculator
Compute sale price, savings and effective discount.
GPA Calculator
Compute your GPA on the US 4.0 scale, weighted by credits.
Hourly to Salary Calculator
Convert between hourly wage, weekly, monthly and annual salary - configurable hours/week.
Income Tax Estimator (US Federal)
Estimate your US federal income tax with progressive brackets.
Loan & Mortgage Calculator
Estimate monthly payments, total interest and amortization.
Microwave Time Converter
Recipe written for an 800 W microwave but yours is 700 W? Get the right cooking time in one tap.
Mortgage vs Rent Calculator
Find your buy-vs-rent break-even point in months.
Pace Calculator
Running pace, distance and time - any two, get the third. Splits in km and miles.
Percentage Calculator
Five percent modes in one tool: X% of Y, percent change, reverse percentage, plus add or subtract a percent.
Recipe Scaler
Scale a recipe up or down by servings or a multiplier.
Rule of Three Calculator
Solve a proportion: if A is to B, then C is to ? - leave any box empty and we'll fill it in.
Salary After Tax Calculator
Net annual and monthly take-home pay across 5 countries.
TDEE Calculator
Daily calorie needs using Mifflin-St Jeor BMR and activity multiplier.
Time Duration Calculator
How many hours, minutes or seconds between two times - or two full datetimes - in your browser.
Tip Calculator
Calculate the tip and split the bill between any number of people.
Converters
Crypto Converter
Convert between Bitcoin, Ethereum, 18 other major cryptocurrencies and 10 fiat currencies - in your browser.
Currency Converter
Convert between 46 currencies at mid-market rates, see a multi-currency table at a glance, and check your bank's spread.
Morse Code Translator
Encode and decode Morse code with audio playback - in your browser, no upload.
Number Base Converter
Convert numbers between binary, octal, decimal and hexadecimal.
Oven Temperature Converter
Convert between Celsius, Fahrenheit and UK gas marks.
Roman Numeral Converter
Convert decimal numbers to Roman numerals and back.
Timezone Converter
Convert a time between any two IANA timezones.
Unit Converter
Convert length, weight, temperature, volume and more.
Unix Timestamp Converter
Convert between Unix epoch (seconds or milliseconds) and human-readable date / time, in UTC and local.
Text & writing
Case Converter
Convert text to UPPER, lower, Title, camelCase, snake_case, kebab-case.
Character Counter
Count characters with and without spaces, in real time.
Find and Replace
Find and replace text with optional regex, case-sensitivity, and live match count - in your browser.
Remove Duplicate Lines
Paste any list and we'll strip out the duplicates - case-sensitive or not, order preserved or sorted.
Slug Generator
Turn any title into a clean, URL-safe slug.
Sort Lines
Sort any list of lines A-Z, Z-A, by length, or randomise - case-aware, in your browser.
Text Diff
Compare two texts line by line, with added / removed counts.
Word Counter
Count words, characters, sentences and reading time.
Word Frequency Counter
Count how often each word appears, with stop-word filter.
Design
Border-Radius Generator
Asymmetric border-radius with all 8 corner values, live preview and shape presets (pill, blob, leaf, ticket).
Color Converter (HEX, RGB, HSL)
Convert colors between HEX, RGB, HSL and OKLCH.
Color Palette Generator
Generate complementary, analogous, triadic, tetradic and monochromatic palettes from any base colour.
Color Shade Generator
Generate 10 shades and 10 tints of any colour - ready as a hex list or CSS variables.
Contrast Checker
WCAG colour-contrast checker with live ratio, AA/AAA pass-fail badges and sample text.
CSS Box-Shadow Generator
Layer multiple CSS box-shadows with live preview, presets and a copy-ready declaration.
CSS Clip-Path Generator
Build polygon clip-paths visually - triangle, hexagon, star, message bubble and more - with a live preview and copy-ready CSS.
CSS Filter Generator
Live CSS filter playground with sliders for blur, brightness, contrast, saturate, sepia, grayscale, invert, hue-rotate and opacity.
CSS Gradient Generator
Build linear and radial CSS gradients with a live preview.
Cubic-Bezier Generator
Visual cubic-bezier editor with animated preview and 12 industry-standard easing presets.
Favicon Generator
Drop a square image, download PNG favicons in every standard size.
Glassmorphism Generator
Frosted-glass CSS with live preview - tune background colour, backdrop blur, border and shadow over a busy backdrop.
Developer
Base64 Encoder / Decoder
Encode and decode Base64 strings (text and files).
Cron Expression Reader
Decode a cron expression into plain English plus the next 5 run times.
CSV to JSON Converter
Convert CSV to JSON and back, with custom delimiter.
Hash Generator (SHA-1, SHA-256, SHA-384, SHA-512)
Compute cryptographic hashes of text in your browser.
HTML Entity Encoder / Decoder
Encode and decode HTML entities, named and numeric.
HTML Minifier
Strip whitespace, comments and quotes from HTML - in your browser, with a before/after size report.
JSON Formatter & Validator
Format, minify and validate JSON instantly.
JWT Decoder
Decode and inspect JSON Web Tokens locally.
Markdown Table Generator
Build a Markdown table from rows and columns with column alignment - or paste CSV / TSV and get the table back.
Markdown to HTML Converter
Convert Markdown to HTML and back, with a live preview.
Mock Data Generator
Generate fake user records - name, email, phone, address - as JSON or CSV. No signup, no API call.
Regex Tester
Test and debug regular expressions with live highlights.
SQL Formatter
Pretty-print SQL with consistent keyword casing and line breaks.
URL Encoder / Decoder
Percent-encode and decode URLs and query strings.
XML Formatter
Pretty-print or minify XML with proper indentation - in your browser, no upload.
YAML to JSON Converter
Convert YAML to JSON and back, in your browser.
Generators
Dice Roller
Roll N dice with M sides (d4 / d6 / d20 / custom) - cryptographically random, in your browser.
List Randomizer
Shuffle a list, pick N random items, or draw a single winner - using your browser's CSPRNG.
Lorem Ipsum Generator
Generate placeholder text by paragraphs, sentences or words.
Password Generator
Generate strong, random passwords using your browser's CSPRNG.
QR Code Generator
Create QR codes for URLs, Wi-Fi, contacts and plain text.
Random Number Generator
Cryptographically secure random integers, with range, count and uniqueness.
Username Generator
Generate random usernames - adjective + noun + number, or pick a theme. All client-side.
UUID Generator
Generate v4 (random) and v7 (time-sorted) UUIDs in bulk.