Converters

Turn one format into another in a couple of clicks. Convert colours between HEX, RGB, HSL and OKLCH, switch units of length, weight and temperature, translate Unix timestamps into readable dates, change number bases, or transform CSV into JSON and Markdown into HTML — fast, accurate and completely private.

Color Converter HEX, RGB, HSL and OKLCH. Live

Unit Converter Length, weight, temperature, more. Live

Timestamp Unix epoch to a human date. Live

Number Base Binary, octal, decimal and hex. Live

CSV to JSON Paste a CSV, get clean JSON. Live

Markdown Live Editor Real-time GFM editor and preview. Live

Roman Numerals Numbers to Roman numerals and back. New

Cooking Converter Cups, grams, ounces and millilitres. New

Data Storage Bytes, KB, MB, GB and binary units. New

JSON to YAML Convert JSON to YAML and back. New

JSON to CSV Turn JSON objects into a CSV file. New

XML to JSON Convert XML to JSON and back. New

Shoe Size Converter US, UK, EU and CM shoe & clothing sizes. New

Why use these converters?

Every tool in this collection runs entirely in your browser. That means there's nothing to install and nothing to sign up for, and crucially, the files and text you work with never leave your device — no uploads, no accounts, no tracking. Just open a tool and get the job done.

Browse the full set of ToolNest tools, or jump straight to the one you need above.