All Tools
Browse free online utilities by category.
24 tools
24 / 24
Conversion & Calculators
Unit Converter
Convert length, weight, temperature, volume, speed, and area between metric and imperial units.
Percentage Calculator
Calculate percentages, percentage change, and what percent one number is of another.
BMI Calculator
Calculate Body Mass Index using metric or imperial measurements.
Age Calculator
Find your exact age in years, months, and days from your date of birth.
Loan Calculator
Estimate monthly payments and total interest for personal or auto loans.
Tip Calculator
Calculate tip amounts and split the bill evenly among your group.
Text & Date
Word Counter
Count words, characters, sentences, and paragraphs in any block of text.
Case Converter
Convert text to UPPERCASE, lowercase, Title Case, or sentence case instantly.
Text Diff
Compare two blocks of text line by line. Highlights added and removed lines.
Markdown Previewer
Live Markdown editor with instant preview. Supports GFM tables and code.
Date Calculator
Calculate days between two dates, or add and subtract from a date.
Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates. Live current timestamp.
Developer Tools
JSON Formatter
Format, validate, and beautify JSON with minify or prettify options.
JSON to CSV
Convert JSON arrays of objects to CSV for spreadsheets and data tools.
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 strings back to plain text.
JWT Decoder
Decode JSON Web Tokens to inspect header, payload, claims, and expiry.
URL Encoder / Decoder
Encode special characters for URLs or decode percent-encoded strings.
Hash Generator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 digests from text (Web Crypto).
Color Converter
Convert colors between HEX, RGB, and HSL with a live preview swatch.
UUID Generator
Generate UUID v4 values in bulk. Copy or download the result list.
QR Code Generator
Generate QR codes for URLs or text and download as PNG.