How the UUID Generator works

This tool generates standards-compliant UUID version 4 identifiers using your browser’s cryptographically secure randomness (`crypto.randomUUID`, or `crypto.getRandomValues` with the correct version and variant bits). It never uses a weak random source. Choose how many you want (1–100) and each UUID is returned on its own line, ready to copy into fixtures, spreadsheets, or scripts.

What is a UUID v4?

A UUID (universally unique identifier), sometimes called a GUID, is a 128-bit value written as 32 hexadecimal digits in the canonical 8-4-4-4-12 form, e.g. `xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx`. Version 4 is randomly generated: the `4` marks the version and the `y` position encodes the RFC 4122 variant (8, 9, a, or b). This tool outputs lowercase, hyphenated UUIDs.

Are UUIDs guaranteed to be unique?

No finite random identifier can be mathematically guaranteed unique, but a UUID v4 generated with secure randomness has an extremely low collision probability, which is why it is widely used for identifiers. This tool does not track previously generated values or detect collisions across sessions.

Are UUIDs generated locally?

Yes. Generation uses your browser’s cryptographic randomness, and the generated UUID values are not sent to PocketSpry’s AI API or any server. UUIDs are identifiers — this is not a password, API-key, or secret-token generator.

Frequently asked questions

What UUID version does this generate?: UUID version 4 (randomly generated).
How random are the generated UUIDs?: They use your browser’s cryptographically secure randomness, never Math.random.
Are UUIDs guaranteed unique?: There is no mathematical guarantee, but the collision probability is extremely low.
Can I generate multiple UUIDs at once?: Yes, up to 100 at a time, one per line.
Why are the UUIDs lowercase?: For a predictable canonical presentation. UUID hexadecimal is case-insensitive in common parsing contexts.
Can I remove the hyphens or get uppercase?: Not in v1. The canonical lowercase, hyphenated form is used.
Does this generate UUID v1 or v7?: No. This tool generates UUID v4 only.
Does PocketSpry store generated UUIDs?: No. They are generated in your browser and not persisted.
Are these UUIDs safe to use as passwords or API keys?: This is a UUID identifier generator, not a dedicated password or secret-token generator. Use a purpose-built secret generator for credentials.