UUID / GUID Generator

Generate Universally Unique Identifiers in v1, v3, v4, v5, and v7 formats. Bulk generate up to 100 at once. Format options for uppercase, no hyphens, and braces. 100% client-side.

v4 Random Cryptographically random — most common

v7 Time-ordered Timestamp prefix — sortable, database-friendly

v1 Time-based Gregorian timestamp + random node

v5 Name-based SHA-1 Deterministic from namespace + name

v3 Name-based MD5 Deterministic from namespace + name

Uppercase A1B2C3D4-… Remove hyphens a1b2c3d4e5f6… Wrap in braces {a1b2c3d4-…}

Quantity

About the UUID Generator

A UUID (Universally Unique Identifier), also known as a GUID (Globally Unique Identifier), is a 128-bit label used to uniquely identify information in computer systems. UUIDs are standardised by RFC 9562 and are designed to be unique without requiring a central registration authority.

UUID versions

v4 — Random — 122 bits of cryptographically random data. The most widely used version. Each UUID is guaranteed to be unique with overwhelming probability.
v7 — Time-ordered — Encodes a Unix millisecond timestamp in the first 48 bits, making UUIDs sortable chronologically. Ideal for database primary keys where index locality matters.
v1 — Time-based — Uses a Gregorian epoch timestamp and a node identifier. Older standard; v7 is preferred for new applications.
v5 — Name-based SHA-1 — Deterministic: the same namespace + name always produces the same UUID. Use when you need a stable ID derived from a known value.
v3 — Name-based MD5 — Same as v5 but uses MD5. Prefer v5 for new applications as SHA-1 is stronger than MD5.

UUID structure

A UUID is represented as 32 hexadecimal characters in 5 groups separated by hyphens: xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx where M is the version digit and N indicates the variant.