Converter Tools

Convert between units, formats, and values. Hex to RGB, px to rem, and more.

Converter tools eliminate the mental overhead of switching between formats. Need to turn a hex colour code into RGB values for your CSS? Convert a pixel measurement to rem? Translate between data formats? These tools give you the answer the moment you paste in a value — no formulas, no lookup tables, no second-guessing. All conversions run locally in your browser, so your data never leaves your device.

Converter Tools11 tools

Hex to RGB Converter

Convert hex color codes to RGB, HSL, and CSS values instantly. Real-time preview, one-click copy. Free — no signup required.

Open tool

RGB to HEX Converter

Free RGB to HEX converter. Enter red, green, and blue values (0–255) and get the hex color code instantly. Also outputs HSL and CSS expressions. Real-time preview, one-click copy. No signup required.

Open tool

Temperature Converter

Free temperature converter. Convert between Celsius, Fahrenheit, and Kelvin in real time. Type in any field and all three update instantly. No signup required.

Open tool

Number to Words Converter

Free number to words converter. Type any number and get the English word form instantly — cardinal (one hundred), ordinal (first, second), or currency (dollars and cents). Supports numbers up to quintillions. No signup required.

Open tool

Roman Numeral Converter

Free Roman numeral converter. Convert any number from 1 to 3999 to Roman numerals, or decode Roman numerals back to Arabic numbers. Works both ways — just type and get the answer instantly. No signup required.

Open tool

Decimal to Binary Converter

Free decimal to binary converter. Type any number in decimal, binary, octal, or hex and all four update instantly. Supports numbers up to 64-bit (18,446,744,073,709,551,615). No signup required.

Open tool

Unix Timestamp Converter

Free Unix timestamp converter. Paste a Unix timestamp (seconds or milliseconds) and see the human-readable date instantly. Or pick a date and get the timestamp. Shows UTC, local time, and relative time. No signup required.

Open tool

Color Converter

Free color converter. Convert any color between HEX, RGB, and HSL formats instantly. Type a hex code, RGB values, or HSL values — all three update in real time. Includes a live color preview and common color swatches. No signup required.

Open tool

Binary to Text Converter

Free binary to text converter. Paste binary code (01001000 01100101...) and instantly decode it to readable text. Or type any text and convert it to binary. Supports space, comma, and no-separator formats. No signup required.

Open tool

Percentage Calculator

Free percentage calculator. Find what percent of a number is, calculate what percentage one number is of another, or get the percentage change between two values. Results update as you type. No signup required.

Open tool

Contrast Checker

Free WCAG color contrast checker. Enter any foreground and background color to instantly see the contrast ratio and whether it passes WCAG AA and AAA for normal text, large text, and UI components. No signup required.

Open tool

What are converter tools?

Converter tools translate values from one format or unit to another instantly — no formula lookup, no mental math. They are most useful in development and design workflows where you frequently need to switch between colour formats (hex, RGB, HSL), measurement units, or data representations. Every conversion runs locally in your browser: you paste a value, get the output, and move on.

Common uses for online converters

Converter tools are a daily shortcut for designers, developers, and anyone working across different tools or standards:

Converting hex colour codes to RGB values for CSS, Tailwind, or design system tokens
Translating between pixel and rem measurements when building responsive layouts
Converting between data formats (JSON, YAML, CSV) when working across APIs and config files
Quickly checking what a colour looks like in a different format without opening a colour picker
Encoding and decoding values (Base64, URL encoding) when debugging web requests