Developer tools
The small utilities developers reach for daily. Format JSON, decode base64, inspect JWT tokens, encode URLs, generate hashes and UUIDs, test regex patterns, and convert timestamps — all running locally, so your secrets, tokens, and payloads never touch a server.
8 tools
JSON formatter
Prettify, minify and validate JSON in your browser — no upload, instant results.
Base64 encode / decode
Encode and decode Base64 text instantly — UTF-8 safe, no upload, runs in your browser.
JWT decoder
Decode and inspect JWT tokens — header, payload and signature at a glance, all client-side.
URL encode / decode
Encode and decode URL strings — handle query parameters, paths, and special characters safely, all client-side.
Hash generator
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes — instant, client-side, via the Web Crypto API.
UUID generator
Generate random v4 UUIDs in bulk — RFC 4122 compliant, via crypto.randomUUID(), all client-side.
Regex tester
Test regular expressions with live highlighting — see matches, capture groups, and flags in real time, all client-side.
Timestamp converter
Convert between Unix timestamps and human-readable dates — seconds or milliseconds, in your timezone, all client-side.
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100% client-side · runs in your browser
no uploads · files never leave your device
no sign-up · free and instant