UUID Generator
Fixpio’s UUID generator creates version-4 UUIDs in your browser — one at a time or 500 in a batch, with uppercase and no-hyphen formats for your database or API.
Generate UUIDs
Choose a quantity and format — a batch is ready below already.
UUIDs, done properly
What makes a generated ID trustworthy.
What a UUID is
A Universally Unique Identifier is a 128-bit value written as 32 hex digits in five groups — designed so two generated anywhere on Earth effectively never collide.
Why version 4
Version 4 is the random kind: no timestamp, no machine address, nothing about you embedded in the ID. It is the version most APIs and databases expect by default.
Where they get used
Database primary keys, API resource IDs, file names, session tokens and test data — anywhere a short, unique, hard-to-guess label is needed.
About this UUID generator
This UUID generator creates version-4 UUIDs in your browser. A version-4 UUID is a 128-bit identifier in which 122 bits are filled with randomness and the remaining bits mark the version (4) and variant, giving the familiar shape xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where y is 8, 9, a or b. Where the browser provides crypto.randomUUID() the tool uses it directly; otherwise it builds the same UUID from crypto.getRandomValues and sets the version and variant bits itself.
Because the randomness comes from a cryptographic source, collisions are not a practical concern: you would need to generate billions of UUIDs before chance alone made a duplicate likely, and the standard was designed for exactly this use — identifiers minted independently, on different machines, without a central registry to ask. The generator can produce up to 500 at a time for seeding databases or test fixtures, with options for uppercase output and removing the hyphens for systems that store the compact 32-character form.
One honest limitation: a UUID identifies, it does not authenticate. UUIDs are excellent labels, but a v4 UUID on its own is not a password or a security token design — for secrets, use a dedicated token scheme (and a long random password from a generator like Fixpio’s) rather than an identifier format. Everything here runs locally; the generated IDs are never uploaded or stored.
Frequently asked questions
Versions, collisions, formats and privacy — answered.
What is a UUID?
A UUID (Universally Unique Identifier, also called a GUID in Microsoft ecosystems) is a standard 128-bit ID written as five groups of hexadecimal digits separated by hyphens, for example 550e8400-e29b-41d4-a716-446655440000. Systems use them to label records, files and sessions without coordinating with a central counter.
What does version 4 mean?
Version 4 UUIDs are generated from random numbers — the 4 in the third group marks the version, and 122 of the 128 bits are random. Other versions embed timestamps or hashes; version 4 is the general-purpose choice and what this generator creates.
Can two generated UUIDs ever be identical?
In theory yes, in practice no. With 122 random bits drawn from a cryptographic source, the odds of a duplicate are so small that production systems worldwide rely on v4 UUIDs as unique keys every day.
Why would I remove the hyphens or use uppercase?
Some databases, file systems and APIs store the compact 32-character form, and a few older systems expect uppercase. The underlying ID is the same either way — these options just format it.
Are the UUIDs generated on a server?
No. They are created in your browser with its built-in secure random generator. Nothing is uploaded, and Fixpio keeps no record of the IDs you generate.
How many can I generate at once?
Up to 500 per batch. You can copy the whole list or download it as a text file with one UUID per line.