About BasaltKit
Free, fast, developer-grade tools. Solid as stone — and nothing ever leaves your browser.
Why BasaltKit exists
Most online tools quietly upload your data to a server, process it there, and show you the result. That is unnecessary for most everyday tasks — formatting JSON, converting data, hashing a string or decoding a token can all be done with code that runs in your own browser.
BasaltKit takes the local-first route: every one of our 25 tools computes on your device. Results appear instantly, the tools work offline once loaded, and sensitive content — API keys, customer records, private files — never touches a network. Like its namesake basalt, the promise is simple and solid.
What's inside
- JSON Tools — JSON Formatter & Validator, JSON to CSV Converter, JSON to TypeScript, JSON to XML Converter, JSON to YAML Converter, XML to JSON Converter, JSON Escape / Unescape, JSON Flatten / Unflatten, JSON Key Sorter.
- Formatters — SQL Formatter, CSS Formatter & Minifier, XML Formatter & Minifier, URL & Query String Parser, HTTP Header Formatter, Cookie Parser & Formatter.
- Encode & Crypto — Base64 Encode / Decode, Hash Generator, JWT Decoder, UUID Generator, Password Generator, AES-256 Encrypt / Decrypt, Encode / Decode, Unicode Converter.
- Developer — Cron Expression Generator.
- Images — Image Compressor.
The principles
- Nothing uploaded, ever. If a feature would need your data on a server, we build it so it doesn't.
- No signup. Open the page, use the tool, get on with your day.
- Fast and light. Static pages, no framework bloat, sub-second loads.
- Honest output. Clear errors with exact positions, no silent guessing.
Contact
Feedback, bug reports and tool requests are welcome at support@basaltkit.com.