🛠️ Dev utilities
UUIDs, regex, hashes, and more. All 13 tools run free in your browser — no sign-up, no uploads.
Add Chinese comments to your code automatically using AI.
Interpret a 5-field cron schedule expression.
Generate SHA hashes for any text using the browser Web Crypto API.
Look up any IP or your own — see location, ISP, and more.
Decode any JWT into its header and payload for inspection.
Generate strong, cryptographically secure random passwords right in your browser. Customize the length (up to 256 characters), choose which character types to include (lowercase, uppercase, numbers, symbols), and optionally avoid ambiguous characters like 0/O/l/I. Our password generator uses the Web Crypto API for maximum randomness — and everything runs locally, so your passwords are never transmitted.
Test how strong a password is with live, private feedback.
Generate QR codes from any text or URL entirely in your browser.
Generate cryptographically secure random numbers within any range. Set minimum, maximum, count, and optionally exclude duplicates. Uses the Web Crypto API for maximum randomness.
Get a random network port number in the valid range.
Test regex patterns against any text and see all matches with their positions.
Generate one or more UUID v4 (GUID) identifiers with cryptographic randomness.
Generate an arithmetic (linear) sequence.