I’ve put together a collection of free online developer tools, all available directly on this site at cmik.me/tools. No sign-up, no tracking — just quick utilities for everyday dev tasks.

What’s inside

• Encoding & conversion: Base64, URL, HTML encoder/decoder, JSON ⇄ XML, CSV ⇄ JSON ⇄ XML, number base converter, unit converter
• Security & crypto: AES encryption, SHA-512, password generator, password strength tester, JWT decoder, SSL certificate checker
• API & dev workflow: REST API tester, cURL command generator, Swagger viewer, WebSocket tester, JSON viewer/formatter, JSON diff, JSON compressor
• Text & data: Diff viewer, text cleaner, text counter, case converter, Markdown editor, Lorem Ipsum generator, test data generator
• Misc: UUID generator, QR code generator, timestamp converter, cutting stock optimizer

Most tools are also available in French. Check them out at cmik.me/tools and let me know if there’s a tool you’d like to see added.