Small, free web tools that do one job well
38 free, single-purpose tools that run entirely client-side, with no account, no clutter, and no data leaving the device. Pick one below and get straight to it.
Tools
QR Code Generator
Turn any link or text into a scannable QR code, free, right in the browser. Download as PNG or SVG.
Unit Converter
Convert length, weight, volume, and temperature between metric and imperial units instantly, right in the browser.
Password Generator
Generate a strong random password or a memorable passphrase, instantly, entirely client-side.
Date Calculator
Find your exact age or the number of days between two dates, instantly, with nothing uploaded.
Image Compressor
Compress and resize a photo instantly, right on your device. Nothing is ever uploaded.
Word Counter
Count words, characters, sentences, and paragraphs instantly as you type, with no server round-trip.
Color & Contrast Checker
Pick and convert colors, and check WCAG contrast ratio, instantly, right in the browser.
Text Diff Checker
Compare two blocks of text and see exactly what changed, instantly, entirely client-side.
Pomodoro Timer
Work in focused intervals with scheduled breaks, with nothing uploaded. Customizable, with session tracking.
Screen & Webcam Recorder
Record your screen or webcam and download the video, right on your device. No account, no upload.
CSV ⇄ JSON ⇄ Markdown
Convert between CSV, JSON, and Markdown tables with a sortable live preview, with no server round-trip.
Unix Timestamp Converter
Convert a Unix timestamp to local time, UTC, or any timezone. And back again, right in the browser.
Currency Converter
Convert between 30+ world currencies using live, daily-updated exchange rates, entirely client-side.
Percentage Calculator
Calculate percentages, percent of, percentage change, and more, instantly, with nothing uploaded.
BMI Calculator
Calculate your Body Mass Index in metric or imperial units and see your weight category, right on your device.
Mortgage & Loan Calculator
Calculate your monthly mortgage payment, taxes, insurance, and PMI, plus a full amortization schedule, with no server round-trip.
Typing Speed Test
Measure your typing speed in words per minute with live accuracy tracking, right in the browser.
Tip Calculator
Work out the tip and split the bill between any number of people, instantly, entirely client-side.
GPA Calculator
Calculate your weighted GPA on the standard 4.0 scale from your course grades, with nothing uploaded.
Salary Calculator
Convert pay between hourly, weekly, monthly, and annual, and estimate take-home pay, right on your device.
Calorie Calculator
Estimate your BMR and daily calorie needs (TDEE) using the Mifflin-St Jeor equation, with no server round-trip.
Compound Interest Calculator
Project how your savings grow with compound interest and regular contributions, right in the browser.
Discount Calculator
Calculate a sale price from a discount percentage, or find the discount between two prices, entirely client-side.
Sales Tax & VAT Calculator
Add tax to a price, or extract the tax already included in a total, with nothing uploaded.
Pregnancy Due Date Calculator
Estimate your due date and how far along you are, from your last period or conception date, right on your device.
Random Generator
Roll dice, flip coins, generate a random number, or pick from your own list, with no server round-trip.
Countdown Timer
Count down to any date and time with a live days, hours, minutes, and seconds breakdown, right in the browser.
Multiplication Table Generator
Generate a times table for one number, or a full multiplication grid, entirely client-side.
Lorem Ipsum Generator
Generate placeholder text by words, sentences, or paragraphs, with nothing uploaded.
Binary, Hex & Decimal Converter
Convert a number between bases, or text to and from binary/hex, right on your device.
JSON Formatter & Validator
Format, validate, or minify JSON, with clear error locations, with no server round-trip.
Regex Tester
Test a pattern against your own text with live match highlighting, right in the browser.
Base64 & URL Encoder/Decoder
Encode or decode text as Base64 or URL-encoded, entirely client-side.
Password Strength Checker
Check how strong a password is, with an entropy and crack-time estimate, with nothing uploaded.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes of any text, right on your device.
Text Case Converter
Convert text between UPPERCASE, camelCase, snake_case, and more, with no server round-trip.
Sudoku Solver
Solve any 4×4, 9×9, or 16×16 Sudoku puzzle instantly, or reveal just one more number, right in the browser.
Triangle Calculator
Enter any 3 sides or angles and get every remaining side, angle, area, and more, entirely client-side.
Guides
Plain-language explainers on the ideas behind our tools. Where the numbers come from, what they mean, and where they fall short. Read the guides.