🆔 UUID Generator & Validator

Bulk random UUID v4 (GUID) generation, validation & inspection — privately in your browser — by Dinal Studios

⚡ Generate UUIDs BULK · V4

Generate from 1 to 100 cryptographically random version-4 UUIDs at once — perfect for database seed data, test fixtures and unique IDs. Copy them all or download as a text file.

🔒 UUIDs are generated on your device with the Web Crypto API. Nothing is uploaded or stored.

🔍 UUID Validator & Inspector

Paste any UUID to check whether it is well-formed and to inspect its version and variant — the two fields hidden inside every UUID.

🎓 UUID Versions & Variants, Explained

A UUID is 128 bits, usually written as 32 hex digits in 5 groups: xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx. The M digit is the version; the N digit encodes the variant.

VersionHow it's madeUsed for
v1Timestamp + MAC addressLegacy systems. Leaks the generating machine's MAC & time — avoid for privacy-sensitive IDs.
v3 / v5MD5 / SHA-1 hash of a namespace + nameDeterministic IDs: the same name always produces the same UUID.
v4122 bits of pure randomnessThe default choice — database keys, file names, request IDs. This tool generates v4.
v7Unix timestamp + randomnessNewer, time-ordered — sorts naturally in databases while staying hard to guess.
How unique is "unique"? A v4 UUID has 122 random bits ≈ 5.3 × 1036 possibilities. You would need to generate billions per second for centuries before a collision became likely — that's why UUIDs can be minted independently on millions of devices without a central registry.
UUID ≠ secret. A UUID is an identifier, not a password or an access token. Never rely on "nobody will guess the UUID" as your only security control — always check authorization on the server too.

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