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UUID Generator

Bulk random UUID v4 generation with format options.

Use the UUID Generator tool

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What this uuid generator does

UUID Generator produces version 4 identifiers, which are 122-bit random values formatted as 8-4-4-4-12 hexadecimal characters. They are designed to be unique without coordination between systems, which makes them convenient for database keys, request IDs and idempotency tokens.

Values come from crypto.randomUUID() or, on older browsers, crypto.getRandomValues(). You can generate a single ID or a batch of up to 1,000 and download them as a newline-separated file.

Why use it

  • Seed test fixtures and database rows with realistic identifiers.
  • Create idempotency keys for payment and messaging APIs.
  • Generate trace IDs for distributing across log lines.

How to use it

  1. 1Choose how many UUIDs you need.
  2. 2Select a format: lowercase, uppercase, or without hyphens.
  3. 3Press Generate, then copy all or download the list.
  4. 4Regenerate to discard the previous batch entirely.

Worked examples

Standard v4

Input

Count 3

Output

f81d4fae-7dec-4f0f-a765-00a0c91e6bf6
0b7c4c2e-9a1b-4a3f-8d55-1f5c0c9a2d31
6f1c2b7a-3d4e-4c8f-9b2a-7e5d1c0b9a8f

Common mistakes

  • Treating UUIDs as secrets — they are identifiers, not authentication tokens.
  • Using UUID v4 as a sequential primary key without considering index fragmentation.
  • Assuming uniqueness is mathematically guaranteed; it is statistically overwhelming, not absolute.

Frequently asked questions

Are UUID v4 values truly random?
They contain 122 random bits. The chance of a collision across billions of IDs is negligible, but monitoring and unique constraints are still good practice.
What is the difference between UUID v4 and v7?
v4 is fully random. v7 embeds a millisecond timestamp at the front, which sorts chronologically and is friendlier to database indexes.
Can I use these UUIDs in production?
Yes. They are standard RFC 4122 identifiers generated with a CSPRNG.

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