We're on a mission to build the most powerful free HTML editor online that respects your privacy. No servers, no telemetry, no limits — just pure developer software that works.
As software engineers, we were frustrated with HTML tools that sent our data to unknown servers, required accounts, or couldn't handle large files. We wanted a HTML editor online that was fast, private, and actually enjoyable to use.
So we built it. A free HTML formatter and validator that runs entirely in your browser using WebAssembly. No telemetry, no data collection, no hidden costs — just reliable developer software for the engineering community.
"The best HTML editor is the one you don't have to think about — it just works, privately."
— founding engineer
All processing happens locally. Your data never touches a server — ever.
No paid tiers, no hidden features. The full HTML validator and formatter are completely free.
Transparent codebase. Community-driven. MIT licensed.
WASM-accelerated parsing handles 500MB+ files with sub-50ms response times.
founding engineer
Former infrastructure lead. Obsessed with performance and clean code.
ai & wasm engineer
WebAssembly specialist. Built our local AI inference engine.
developer experience
Previously at GitHub. Focuses on making tools developers actually enjoy.
Joined by 150+ open source contributors
Join 50,000+ software developers who trust our HTML formatter, validator, and viewer for their daily work.
© 2026 json.edit — free HTML editor online • mit licensed • zero telemetry
