UUID Generator
Generate free UUID v4 identifiers online. Create one ID or a batch for testing, databases, and APIs — all privately in your browser.
How to Use the Online UUID Generator
- Set how many UUIDs you need — leave the count at 1 for a single ID, or enter a number up to 500 for bulk generation.
- Click "Generate" — the tool creates cryptographically strong UUID v4 values with the uuid library in your browser.
- Copy each UUID — use the copy button beside any result. Need other random values? Try the random number generator or password generator.
About This Free UUID Generator
A UUID (Universally Unique Identifier) is a 128-bit value used to identify records, sessions, and resources without a central counter. This free online UUID generator creates version 4 UUIDs — random identifiers widely used as primary keys, API tokens, and test fixtures.
GUID is Microsoft’s name for the same concept; most UUID v4 strings work anywhere a GUID is expected. Everything runs locally in your browser — nothing you generate is uploaded. Pair this tool with our hash generator or Base64 encoder when you need related developer utilities.
Frequently Asked Questions (FAQ)
What is a UUID generator?
A UUID generator is an online tool that creates Universally Unique Identifiers — 128-bit values written as hyphenated hex strings. Developers use them for database keys, session IDs, and distributed systems where uniqueness matters.
Are UUID and GUID the same?
Yes for most practical purposes. GUID is Microsoft’s term for a UUID. A standard UUID v4 string is accepted wherever a GUID is required.
How do I generate a UUID online for free?
Open this page, set the count if you need more than one, and click Generate. Copy any result with the button beside it. No account is required.
What UUID version does this tool create?
It generates UUID version 4 (random). Version 4 is the most common choice for application IDs when you do not need time-ordered (v1/v7) identifiers.
Can UUIDs collide?
The chance of two random UUID v4 values matching is astronomically small for normal use. Treat them as unique for databases, APIs, and testing unless you have specialized constraints.
Are UUIDs generated in my browser?
Yes. Generation happens entirely client-side. Your IDs never leave your device, which keeps development and testing private.
Can I generate multiple UUIDs at once?
Yes. Enter a count up to 500 and click Generate to create a batch — useful for seed data, fixtures, and load tests.
Can I copy generated UUIDs?
Yes. Each UUID has a copy button so you can paste it into code, SQL, or config files instantly.
Tips for Using UUIDs
- Prefer v4 for most app IDs: Random UUID v4 is the default for primary keys and opaque tokens when you do not need sortable time-based IDs.
- Bulk-generate for fixtures: Create dozens of IDs at once when seeding databases or writing integration tests.
- Keep generation local: Because this tool runs in the browser, it is safe for quick local experiments without sending data to a server.
- Combine with other ID tools: Use the random number generator for numeric samples or the password generator when you need secrets instead of identifiers.
- Common use cases: Database keys, API correlation IDs, session tokens, game entity IDs, and cryptography-adjacent identifiers.