codetools.run
Free developer tools that run entirely in your browser
codetools.run launched on March 31, 2026 with 2 votes, #5,166 of 23,380 launches that month.
What it does
codetools.run is a collection of 47+ developer utility tools that run entirely in your browser. No signups, no server calls, no data leaves your machine. Format JSON, debug JWTs, test regex, generate UUIDs, convert timestamps, minify CSS/JS, encode Base64, generate QR codes, build CSS gradients, and much more. Every tool is free, fast, and privacy-first. Your data stays in your browser. Always. Built with Next.js, open to feedback. New tools added regularly.
68+ free developer tools: JSON formatter, Base64 encoder, JWT debugger, regex tester and more. All tools run 100% client-side in your browser.
JSON formatter, Base64 encoder, JWT debugger, regex tester and 64 + more. No data ever leaves your browser. Format, beautify and validate JSON online. Free JSON formatter with syntax highlighting, error detection and minify support. Encode and decode Base64 strings online. Free Base64 converter tool for developers. Decode and inspect JWT tokens online. View header, payload and verify JWT signatures. Test and debug regular expressions online. Real-time regex matching with explanation. Encode and decode URLs online. Free URL encoding tool with encodeURIComponent support. Generate random UUIDs (v4) online. Free UUID generator tool for developers. Generate strong, secure passwords online. Free…from codetools.run
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