Generate UUID v4 identifiers privately using your browser’s cryptographic randomness. Create a single value or a batch, choose case and output format, then copy or download.
Generation happens entirely on your device with the browser’s cryptographic random source. No request is sent to a UUID service, and no identifiers or options are saved in browser storage. There are no dependencies, accounts, uploads or device identifiers in the generated values.
UUID version 4 with the standard version and variant bits, displayed in the 8-4-4-4-12 hexadecimal layout. Hyphens are always included. UUID and GUID are often used for the same identifier format. This tool does not generate time-ordered UUID v7 or namespace-based versions.
The tool requests 16 bytes per identifier from crypto.getRandomValues and sets the version/variant bits, leaving 122 random bits per UUID v4. No Math.random fallback is used. If browser cryptographic randomness is unavailable or fails, the run gives no output rather than substituting weaker values.
No random generator can promise that an identifier has never appeared elsewhere. UUID v4 is designed for an extremely low collision probability, not a central global uniqueness check. The tool does not contact a registry or maintain a history. Use your application’s normal uniqueness constraints where required.
One-per-line and comma-separated lists download as UTF-8 TXT. JSON mode downloads a UTF-8 JSON array containing UUID strings. Letter case affects only hexadecimal letters, not the identifier bits. Export contains only the current generated batch without report headings or metadata.
Generate 1–1,000 UUIDs per run. Generating again replaces the current result, and changing count, case or format clears it. Copy or download a batch before replacing it if you need to keep it. Clear result preserves your selected settings. No automatic generation occurs on page load.
No. Generated values remain in the page until you copy or download them, change settings, clear or leave. Input settings and result history are not stored. Only the site’s theme preference is saved. Generation requires a browser with crypto.getRandomValues support.
