Format JSON, decode JWT, test regex, generate passwords, beautify code — all in your browser. Most tools run 100% client-side. No accounts, no uploads, no tracking.
SYS_DIR: /tools/featured — 8 of 47 utilities
Format and validate JSON online
Decode and inspect JSON Web Tokens locally
Test regular expressions online
Generate strong passwords instantly
Generate secure MD5, SHA, and HMAC hashes
Beautify HTML, CSS, and JavaScript code
Compare two texts and highlight differences
Generate random UUIDs online
Most tools — formatting, encoding, hashing, generating — run 100% in your browser. Your JSON, tokens, source code, and passwords never touch a server.
Tools that need server logic (DNS lookups, SSL checks) use lightweight edge functions — clearly noted on each tool page, payloads never logged.
No network round-trip for core tools — results appear as you type.
No payload storage, no server logs for client-side operations.
No account, no paywall, no usage limits. Every tool is MIT licensed.
No more bookmarking random tool sites. No more signing up for a simple format job. One URL, 47 tools, zero friction.
no signup · no credit card · runs instantly
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