UUID Generator
Cryptographically secure random UUIDs (v4), generated by your browser's crypto API. Up to 500 at a time, with uppercase and no-hyphen variants.
Runs locally in your browser
How to use UUID Generator
- Choose how many UUIDs you need: one, five or ten at a time.
- Generate a fresh batch from the browser crypto random source.
- Copy individual values or the whole list into your code.
Common use cases
- Mint IDs for local test records and seed data.
- Name temporary files, rows or cache keys without collisions.
- Generate idempotency keys before retrying an API call.
- Create correlation IDs to trace one request across logs.
Good to know
- UUIDs are random v4 values; they cannot be sorted by creation time.
- Uniqueness is probabilistic — more than sufficient at any practical scale.
- Nothing is stored between visits; regenerate whenever you need more.
FAQ
Are these UUIDs truly random?
Yes — they come from crypto.randomUUID(), your browser's CSPRNG. No server, no seed, no log of what was generated.
What is UUID v4?
A 128-bit identifier with 122 random bits — the odds of a collision are astronomically low (generate a billion per second for ~85 years for a 50% chance of one duplicate).
When would I remove the hyphens?
Some databases and systems store UUIDs as plain 32-char hex strings. The value is identical either way — hyphens are just formatting.