UUID Generator
Generate random v4 or time-ordered v7 UUIDs — one or up to 1,000 at a time — and validate existing ones.
Runs in your browser — nothing is uploadedVersion
Format
Check a UUID
v4 UUIDs are 122 bits of randomness — collisions are practically impossible.
About UUID Generator
A UUID (universally unique identifier) is a 128-bit ID, usually written as 36 characters like 3f2a…-…, that can be generated anywhere without a central database and still be unique. Developers use them for database keys, API resources, file names and tracking IDs.
Generate random version 4 UUIDs or time-ordered version 7 UUIDs — one at a time or up to 1,000 at once — in the format you need, and validate existing UUIDs.
When to use it
- Primary keys in databases.
- Unique IDs for API requests, events and logs.
- Test data and fixtures.
- Unique file and upload names.
Tips for better results
- Use v7 for database primary keys — time ordering improves index performance.
- Use v4 when the ID should reveal nothing about when it was created.
- Store UUIDs in a native UUID column type where your database supports it.
How to use the UUID Generator
- Choose v4 (random) or v7 (time-ordered).
- Set how many you need and the format.
- Copy or download the list.
Frequently asked questions
What is the difference between v4 and v7?
v4 UUIDs are fully random. v7 UUIDs start with a millisecond timestamp followed by random bits, so they sort in creation order — which keeps database indexes efficient.
Is a GUID the same as a UUID?
Yes. GUID is Microsoft's name for the same 128-bit identifier format. Use the Uppercase and Braces options for the common Windows style.
Can two UUIDs ever be the same?
In practice, no. A v4 UUID has 122 random bits; you would need to generate billions per second for many years before a duplicate became likely.
Are UUIDs secure tokens?
Random UUIDs are hard to guess, but they are designed to be unique rather than secret. For passwords, API keys or reset tokens, use a dedicated secure token generator.
Are the UUIDs generated locally?
Yes. They are created in your browser and never sent to a server.