Free UUID Generator — Bulk GUID Generator Online
Developers need unique IDs constantly — database keys, test data, file names, session tokens. This generator creates version-4 UUIDs using your browser’s cryptographically secure random source, in bulk, with the formatting options real projects need: uppercase, with or without hyphens, copy-all, and one-click .txt download. Nothing is sent to a server, so the IDs you generate are yours alone.
UUID Generator
Bulk-generate secure UUID v4s with your device’s own crypto randomness — copy them all or download a .txt in one click.
1 Generator settings
2 Generate
🆔 Your UUIDs
How it works
Each UUID is produced by crypto.randomUUID() where available (with a getRandomValues fallback that sets the version and variant bits correctly), then formatted to your settings. The list is regenerated fresh on every click — no pool, no reuse, no logging.
Everyday uses
- Developers — primary keys and seed data for tests and migrations.
- QA testers — unique emails, order IDs, and fixture data on demand.
- Data work — anonymized record IDs for spreadsheets and exports.
- DevOps — unique names for buckets, files, and deployments.
Frequently asked questions
Are these UUIDs really unique?
Version-4 UUIDs carry 122 random bits — the chance of a collision is effectively zero for any practical use.
What is the difference between a UUID and a GUID?
None in practice — GUID is Microsoft’s name for the same 128-bit identifier format.
Are the UUIDs stored anywhere?
No. They are generated in your browser and exist only on the page until you copy or download them.