UUID Generator
Free UUID v4 generator. Create one or up to 100 unique identifiers with cryptographically-secure randomness, in your browser.
Press "Generate UUIDs" to create them. Each one is created locally in your browser.
About UUID Generator
Generate UUID version 4 identifiers for databases, APIs, file names or test data. Create one at a time or up to a hundred at once, in lowercase or uppercase, using your browser secure random source - so the values are unique and never generated on a server.
How to use it
- 1Choose how many UUIDs you need (1 to 100).
- 2Pick lowercase or uppercase format.
- 3Click Generate to create them.
- 4Copy a single value or the whole list at once.
Examples
Single UUID
1, lowercase3f2b8c1d-9a4e-4f6b-8c2d-1e5a7b9c0d3fBatch of three
3, lowercasea1…c2
b3…d4
e5…f6Frequently asked questions
Are UUID v4 values truly unique?
They are random 122-bit values, so collisions are astronomically unlikely. For practical purposes in apps, databases and file names they are treated as globally unique.
Can I use these in production?
Yes - they are generated with your browser secure random source, which is appropriate for identifiers. They are not a substitute for cryptographic keys.
Why lowercase by default?
Lowercase is the most common convention in code and URLs. Switch to uppercase if your tooling expects GUID-style casing.