UUID Generator

Generate UUID v4 (random) and UUID v7 (timestamp-based) identifiers. Bulk generation, validation, and decoding — all in your browser.

Generate UUIDs

UUID Validator & Decoder

Paste a UUID to validate its format, detect the version, and decode embedded data.

Understanding UUIDs

A UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems. UUIDs are designed to be unique without a central authority and are widely used in distributed systems, databases, and APIs.

UUID v4 vs UUID v7

UUID v4 is the most common format, generated from random or pseudo-random numbers. Each v4 UUID has 122 random bits, giving a collision probability so low it is practically zero for any real-world application.

UUID v7 is a newer format (RFC 9562) that embeds a Unix timestamp in the first 48 bits. This makes v7 UUIDs monotonically sortable by creation time, ideal for database primary keys where chronological ordering improves index performance.

When to Use Which

  • UUID v4 — General purpose unique IDs, session tokens, idempotency keys
  • UUID v7 — Database primary keys, event sourcing, time-ordered records

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