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What is UUID?

A UUID (also called a GUID) is a 128-bit identifier designed to be unique without a central registry. Version 4 is random; version 7 embeds a timestamp so values sort chronologically.

Also written as Universally unique identifierGUID

Primary sources

Specifications cited by the tools below whose own titles define UUID.

5 tools that work with UUID

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Hash & Crypto Tools3

Nano ID GeneratorGenerate compact URL-safe unique IDs — shorter than a UUID with comparable collision safety.UUID v4 GeneratorGenerate random RFC 4122 version 4 UUIDs in bulk.UUID v7 GeneratorGenerate time-sortable UUID version 7 identifiers — ideal as database primary keys.

Developer Tools2

Format ValidatorValidate emails, UUIDs, IP addresses, credit card numbers, IBANs and semver strings.UUID InspectorIdentify a UUID version and variant, and extract the timestamp from v1, v6 and v7.

Related terms

Terms that appear alongside UUID on the same tools.

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