Your data never leaves your browser
All hashing, encoding and generation runs inside WebAssembly on your device. No servers, no tracking, no network requests.
UUID v4
Generate random UUIDs instantly.
Base64
Encode and decode standard or URL-safe Base64.
SHA hashes
Compute SHA-1, SHA-256 and SHA-512 hashes.
bcrypt
Hash and verify passwords with adjustable cost.
JSON
Format, validate and minify JSON in the browser.
X.509
Decode certificate fields from PEM, DER or Base64.
Local Dev tools is a free, privacy-first developer toolkit. Use it as a UUID generator, Base64 encoder and decoder, SHA-1 / SHA-256 / SHA-512 hash generator, bcrypt hash and verify tool, JSON formatter and validator, or an X.509 certificate decoder. Everything is compiled to WebAssembly and runs entirely in your browser, so sensitive strings, passwords, identifiers and certificates never touch a server.