How to Use UUID Generator

1

Choose how many UUIDs you need, from a single value up to a full batch, and pick uppercase or lowercase.

2

Decide whether to keep the standard hyphens or output the bare 32-character form.

3

Click the "Process" button to generate the batch from a cryptographically secure random source.

4

Copy the whole batch or download it as a text or CSV file for seeding a database.

Features

Generates random version 4 UUIDs, the version used for newly created records

Backed by a cryptographically secure random source, not a predictable sequence

Batch generation with uppercase, lowercase, or hyphen-free output

122 bits of entropy, which makes a collision effectively impossible in practice

Exports to plain text or CSV for bulk database seeding and test fixtures

No sign-up, free to use, and generated values are not logged server-side

Frequently Asked Questions

Version 1 encodes a timestamp and the network address of the generating machine, so it sorts chronologically but leaks information and can be predicted. Version 4 is entirely random with no embedded machine data, which makes it the right choice for anything exposed publicly.

Yes. A v4 UUID carries 122 random bits, and a collision only becomes likely after generating roughly 2^61 values. For context, that is far beyond the number of records any real system will hold, so duplicates are a theoretical rather than practical concern.

It is completely free with no account and no daily limit. You can request a large batch in one go and download it as CSV, which is convenient for populating a seed table or generating test data.

Integers win on index size and join performance, and they are simpler to read in a query log. UUIDs win when you generate data on several machines, merge datasets later, or do not want sequential IDs exposed to users, since those IDs reveal business volume.

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About UUID Generator

A UUID is a 128-bit label, written as eight-four-four-four-twelve hexadecimal characters, that you can generate independently anywhere and never have to coordinate with anyone else. The version most systems use today is version 4, which takes 122 random bits from a cryptographically secure random source, stamps the version nibble as 4, and sets the variant bits to the RFC 4122 value of 10.

That randomness is what makes UUIDs useful as primary keys. Because the generator does not consult a server or a counter, two services can create rows at the same moment without a lock, and a later merge of the two datasets cannot produce a collision. The odds of a duplicate appearing in a database with a billion rows are vanishingly small, and no central authority is required.

The practical trade-offs are worth stating. A 36-character key is larger than a 4-byte integer, which costs index size and cache efficiency, and some database engines have a native 16-byte UUID type that avoids storing the hyphens. Where you cannot use a server-side sequence, a random v4 UUID is usually the right default.

When to Use This Tool

Primary keys in distributed systems where a database sequence is not available
Seeding a test database with realistic-looking record identifiers
Public share links and invite codes that should not be guessable
Merging data from several services or offline devices into one table
Anonymous session or device identifiers for analytics

UUID Generator

Result

Results