46 free, client-side developer tools. No data leaves your browser.
UtilHub is a free collection of essential online utilities built for software engineers, web developers, and IT professionals. Format JSON, encode Base64, generate UUIDs, test regular expressions, decode JWTs, convert between data formats, and much more — all without installing anything.
Every tool runs entirely in your browser. Your data is never sent to any server, making it safe to use with API keys, tokens, and sensitive information.
No sign-up, no downloads, no rate limits. Open any tool and start using it right away. All 46 tools are completely free with no hidden restrictions.
From formatting and encoding to cryptography and image processing — every tool is designed to solve real, everyday development tasks quickly and reliably.