Free Online Converter Tools 20 tools
Converters are the most-used tools on the web, and this collection covers the everyday conversions developers, designers, and students reach for most. Work with CSS units like pixels, REM, and em; translate color values between HEX, RGB, and HSL; or switch between everyday units of length, weight, temperature, speed, and time. You'll also find format converters for Base64, URLs, Markdown, HTML, and binary, plus a file size converter for data units. Every converter runs entirely in your browser, so values are calculated instantly and nothing you type ever leaves your device. No login, no sign-up, no upload — just type a value and read the result. If you work with code or design systems, start with the PX to REM and color converters; for daily life tasks, the length, weight, and temperature converters are the quickest way to get an answer.
PX to REM Converter
Convert pixels to REM units instantly with a customizable root font size.
REM to PX Converter
Convert REM units back to pixels using your preferred root font size.
RGB to HEX Converter
Turn RGB color values into hex codes instantly for CSS and design work.
HEX to RGB Converter
Convert hex color codes to RGB values in one click, with live color preview.
Color Code Converter
Convert between HEX, RGB, HSL, and CSS color formats with a live swatch preview.
Length Converter
Convert length units between meters, kilometers, miles, feet, inches, and more.
Weight Converter
Convert weight between kilograms, pounds, grams, ounces, stones, and tons.
Temperature Converter
Convert temperature between Celsius, Fahrenheit, and Kelvin instantly.
Speed Converter
Convert speed between km/h, mph, m/s, knots, and feet per second.
Time Zone Converter
Convert a date and time between time zones and see UTC offsets side by side.
Currency Converter
Quick currency conversion between major world currencies with editable rates.
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 back to readable text instantly.
URL Encoder / Decoder
Percent-encode or decode URLs and query strings safely in your browser.
Case Converter
Convert text between upper case, lower case, title case, and sentence case.
Binary to Text
Decode binary code into readable text instantly, byte by byte.
Text to Binary
Convert any text into binary code with a single click.
Markdown to HTML
Convert Markdown into clean HTML with a live preview pane.
HTML to Markdown
Convert HTML into readable Markdown for docs, README files, and notes.
Image Dimension Scaler
Scale image dimensions proportionally from one known size to a target width or height.
File Size Converter
Convert file sizes between bytes, KB, MB, GB, and TB with precise decimal results.