UUID generator
Free · no sign-upGenerate random UUID v4 identifiers — one or many, right in your browser.
Generate random UUID v4 identifiers — one or a whole batch — instantly in your browser. This free UUID generator uses your browser's cryptographically secure randomness, and lets you copy any single ID or all of them at once, with or without hyphens and in upper or lower case. Nothing is uploaded.
- ✓Cryptographically random UUID v4
- ✓Generate up to 100 at once
- ✓Copy one or copy all
- ✓Toggle hyphens and letter case
- ✓Runs in your browser — nothing uploaded
Who it's for
- Developers needing unique keys or IDs
- Seeding a database or test data
- Generating API keys or request IDs
- Anyone needing a quick unique identifier
How it works
- 1Choose how many you need.
- 2Press Generate.
- 3Toggle hyphens or uppercase if you like.
- 4Copy one ID or all of them.
Frequently asked questions
What is a UUID v4?+
A universally unique identifier generated from random data. Version 4 UUIDs have 122 random bits, so the chance of a collision is astronomically small — ideal for keys and IDs.
Are these secure and random?+
Yes. They're generated with crypto.randomUUID(), which uses the browser's cryptographically secure random source.
Can I remove the hyphens?+
Yes — toggle hyphens off to get a 32-character hex string, and toggle uppercase if your system expects capitals.
Is anything uploaded?+
No. UUIDs are generated locally in your browser; nothing is sent to a server.
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