UUID Generator
Generate random UUIDs (v4) for your applications.
c3a8c215-59d4-4740-b000-02c9273b41fcc8d6834c-0fcb-43aa-9fb6-d56ad0989152b8e0b545-5212-4268-96ee-67bd849f149e4ebdb649-3b3b-4809-8721-e0d46cfdc4bab5723049-44df-4354-865d-78b0f6f321d2Key Features
- Generates cryptographically random UUID v4 values instantly.
- Produces multiple UUIDs in a single click — choose any batch size you need.
- Copies a single UUID or the entire list to the clipboard in one action.
- Displays UUIDs in both standard hyphenated and compact no-hyphen formats.
- Runs entirely in the browser using the Web Crypto API — no server required.
- Nil UUID and sequential UUID options available for specialised use cases.
Frequently Asked Questions
What is a UUID and when should I use one?
A UUID (Universally Unique Identifier) is a 128-bit identifier designed to be unique across all space and time. Use them as primary keys in databases, to identify resources in APIs, or to track sessions without a centralised counter.
How unique is a UUID v4 really?
UUID v4 has 122 random bits, giving 2^122 possible values — roughly 5.3 × 10^36. The probability of a collision is negligible for any practical application.
Are these UUIDs generated on a server?
No. UUIDs are generated locally in your browser using the Web Crypto API's secure random number generator. Nothing is sent to any server.