UUID v4 is a randomly generated 128-bit identifier — the most commonly used UUID version.

Are these UUIDs truly unique?

With 2^122 possible values, the probability of collision is astronomically low.

Utility tools

UUID Generator

Generate UUID v4 strings — single or bulk — instantly.

PrivateInstantBrowser based

Count

Uppercase

827f5bf0-f2df-4630-91b4-6ef6d80d365c

About UUID v4

• Generated using crypto.randomUUID() — cryptographically secure

• 128-bit random value with 2¹²² possible combinations

• Format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

• All generation is done locally — nothing is sent to any server

Related tools

Generate strong, random passwords with custom length and character sets.

Encode or decode Base64 text instantly in your browser.

Format, validate, and minify JSON with syntax highlighting.