UUID Generator
Generate RFC 4122 v4 UUIDs instantly. Create up to 100 at once with uppercase and no-dashes formatting.
Free, no signup — every UUID is cryptographically random and guaranteed unique.
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How to Generate UUIDs Online
Create unique identifiers for databases, testing, and code in three steps.
Choose Your Options
Pick how many UUIDs to generate (1-100), and toggle uppercase or no-dashes formatting.
Generate
Click Generate UUIDs to instantly create your batch of unique identifiers.
Copy or Download
Copy the list to your clipboard or download it as a .txt file.
// generated
550e8400-e29b-41d4-a716-446655440000
f47ac10b-58cc-4372-a567-0e02b2c3d479
Bulk Generation
Generate up to 100 unique UUIDs in one click — great for seed data and test fixtures.
Flexible Formatting
Toggle uppercase output or strip dashes to match whatever format your system needs.
Instant Results
Generation happens instantly. Copy to clipboard or download as a .txt file.
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Frequently Asked Questions
What does the UUID Generator do?
It generates RFC 4122 version 4 (random) UUIDs — the standard format used for database keys, session IDs, and unique identifiers in code.
How many UUIDs can I generate at once?
You can generate between 1 and 100 UUIDs in a single click, each guaranteed to be unique.
What formatting options are available?
You can output UUIDs in standard lowercase with dashes, uppercase, or with dashes removed entirely — whichever format your system expects.
Are the UUIDs cryptographically random?
Yes. Each UUID is generated using a secure random source and follows the version 4 (random) UUID specification.
What is the difference between a UUID and a GUID?
Nothing meaningful. GUID is Microsoft's name for the same 128-bit identifier; UUID is the name used in the RFC 4122 standard. A v4 UUID generated here is a valid GUID and works anywhere a GUID is expected.
Can two UUIDs ever be the same?
In practice, no. A v4 UUID has 122 random bits, which is about 5.3 undecillion possibilities. You would need to generate billions per second for a century before a collision became likely enough to plan around.
How do I generate UUIDs for database seed data?
Set the count to the number of rows you need, up to 100 per click, then download the list as a .txt file and paste the column straight into your seed script or SQL insert. Turn on uppercase or no-dashes first if your schema stores them that way.
Can I get a UUID without dashes or in uppercase?
Yes. Toggle No dashes to get a 32-character hex string, and Uppercase for systems like SQL Server that display GUIDs in caps. Both toggles can be used together.
Is a UUID safe to use as a primary key?
Yes, and it's common in Postgres, MySQL, and MongoDB. UUIDs let you create IDs on the client before an insert and avoid the collisions you get merging auto-increment tables. The trade-off is a larger key and less index locality than a sequential integer.
Is this free to use?
Yes. The UUID Generator is completely free with no signup, no login, and no limits.
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