UUID Generator

Generate RFC 4122 / RFC 9562 compliant Version 4 UUIDs (Universally Unique Identifiers) and GUIDs in bulk up to 500 at once with uppercase, compact hex, and brace formatting.

Category: Generators

How to Use UUID Generator

  1. Enter the quantity of Version 4 UUIDs to generate (from 1 up to 500 identifiers in a single batch).
  2. Toggle formatting options: Uppercase hex (A–F), Standard Hyphens (8-4-4-4-12 vs compact 32-char hex), or Curly Braces ({...} for Windows Registry/C# GUIDs).
  3. Click Execute UUID Generator to create your batch using browser CSPRNG.
  4. Click Copy Full Report or Download Text File to import the UUID list into your database migration, test fixture, or API payload.

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Frequently Asked Questions

What makes a UUID valid Version 4 under RFC 4122 and RFC 9562?

A standard UUID is a 128-bit (16-byte) value formatted in 8-4-4-4-12 hexadecimal groups. In Version 4, 6 bits are reserved—4 bits set the version nibble to '4' (0100) at the start of the third group, and 2 bits set the variant nibble to '8', '9', 'a', or 'b' (10xx) at the start of the fourth group—leaving 122 cryptographically random bits.

What is the probability of a collision between two v4 UUIDs?

Because each v4 UUID contains 122 random bits (2¹²² ≈ 5.3 × 10³⁶ possible values), you would need to generate approximately 2.71 quintillion (2.71 × 10¹⁸) UUIDs to reach a 50% probability of a single collision under the birthday paradox.

What is the difference between a UUID and a Microsoft GUID?

UUID (Universally Unique Identifier) and GUID (Globally Unique Identifier) refer to the same 128-bit identifier standard. Microsoft ecosystems (.NET, SQL Server, COM/Registry) commonly display GUIDs in uppercase wrapped in curly braces like {F81D4FAE-7DEC-41D0-A765-00A0C91E6BF6}, which you can enable using the Uppercase and Curly Braces toggles.

When should I disable hyphens to generate 32-character compact UUIDs?

Stripping hyphens produces a 32-character hexadecimal string ideal for compact URL slugs, MySQL BINARY(16)/CHAR(32) primary keys, Redis keys, and object storage filenames where punctuation characters are undesirable.

Are these UUIDs generated using Math.random() or a cryptographic PRNG?

EverySolve exclusively uses the browser's Web Crypto API (crypto.randomUUID() and crypto.getRandomValues()), never Math.random(), ensuring every UUID is suitable for production database keys, session identifiers, and idempotency keys.