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DevCodivo

UUID Generator

Generate secure random UUIDs (version 4) in bulk, with formatting options.

Runs in your browser — your data never leaves your deviceFree, no sign-up
Options
Generated UUIDs

Press Generate UUIDs to create secure random v4 identifiers.

How it works

Each UUID is produced by the browser’s cryptographically secure random source, following RFC 4122 version 4: 122 random bits, with the version and variant bits set to their required values. The randomness comes from the operating system, not from any hand-rolled algorithm.

Generation happens entirely on your device — the UUIDs are never sent anywhere and never stored.

Features

  • Secure random v4 UUIDs via the platform CSPRNG
  • Bulk generation, 1–500 at a time
  • Optional hyphen removal and uppercase output
  • Copy all or download as a text file
  • 100% client-side — nothing leaves your browser

How to use

  1. Choose how many UUIDs you need (1–500).
  2. Toggle hyphen or uppercase formatting if you need it.
  3. Press Generate UUIDs, then copy or download the result.

Example

550e8400-e29b-41d4-a716-446655440000
3f2504e0-4f89-41d3-9a0c-0305e82c3301
9f8c3d2a-1b4e-4f6a-8c9d-0e1f2a3b4c5d

Frequently asked questions

What is a UUID?
A UUID (Universally Unique Identifier, also called GUID) is a 128-bit identifier like 3f2504e0-4f89-41d3-9a0c-0305e82c3301. Version 4 UUIDs are generated from random bits, making collisions astronomically unlikely — you would need to generate billions to have a meaningful chance of one duplicate.
Are these UUIDs safe to use as secret tokens?
As identifiers, yes. As secrets, be careful: a v4 UUID provides 122 random bits, which is strong, but UUIDs are not a substitute for a purpose-built secret or session token. Never treat any identifier as proof of identity on its own.
Where are the UUIDs generated?
Entirely in your browser, using the browser's cryptographically secure random number generator (crypto.randomUUID / getRandomValues). No server round-trip, no transmission, no storage — the values are never seen by anyone but you.
What do the digits at the start of the third group mean?
The '4' marks this as a version-4 (random) UUID, and the first character of the fourth group (8, 9, a or b) is the variant marker required by RFC 4122. They are set by the standard, not by chance.
Can I generate UUIDs in bulk?
Yes — up to 500 at a time, with options to remove hyphens or produce uppercase output. Use the copy button to take them all at once, or download them as a text file.

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