About the UUID Generator
A UUID (Universally Unique Identifier), also called a GUID, is a 128-bit value used to uniquely identify information without a central authority. This free online UUID Generator creates version 4 (random) UUIDs using your browser's secure crypto.randomUUID() API.
UUIDs are widely used as primary keys in databases, request and trace IDs in APIs, idempotency keys, file names, and anywhere you need a value that is practically guaranteed to be unique. Generate a single UUID or a batch of up to 100 at once.
How to generate UUIDs
- Enter how many UUIDs you want to generate (1 to 100).
- Click Generate to create the list of random v4 UUIDs.
- Click the copy icon next to any UUID to copy it individually.
- Use Copy All to copy the entire list, one UUID per line.
- Paste the UUIDs into your code, database, or configuration.
Features
- Standards-compliant UUID version 4 (random).
- Cryptographically secure via crypto.randomUUID().
- Generate in bulk — up to 100 at a time.
- Copy individual UUIDs or the whole list at once.
- Runs entirely in your browser — nothing is sent to a server.
UUID Generator (v4) FAQs
What is a UUID v4?
UUID version 4 is generated from random or pseudo-random numbers. It has the form xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where the 4 indicates the version.
Are these UUIDs truly unique?
The probability of a v4 UUID collision is astronomically small. For practical purposes they can be treated as unique across systems and time.
Is the UUID generator free?
Yes, it is completely free, requires no signup, and works directly in your browser.
What is the difference between UUID and GUID?
They are the same concept. GUID (Globally Unique Identifier) is Microsoft's name for a UUID.
Can I generate multiple UUIDs at once?
Yes. Set the count field to generate up to 100 UUIDs in a single click and copy them all together.
