UUIDv5 (SHA-1 Namespace) Unique Identifier Generator
Generate deterministic RFC 4122 UUIDv5 IDs from namespace UUIDs and name strings.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. No data is ever transmitted across the network.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
How to Use UUIDv5 (SHA-1 Namespace) Unique Identifier Generator
Select standard DNS, URL, OID, X500 or enter custom 128-bit namespace UUID.
Type the domain or name string to hash.
Copy the deterministic 36-character UUIDv5 identifier.
Frequently Asked Questions
Why use UUIDv5 over random UUIDv4?
UUIDv5 is deterministic: the same namespace and name string always produce the exact same UUID, avoiding duplicate entity IDs.
What hashing algorithm powers UUIDv5?
UUIDv5 uses SHA-1 hashing according to the IETF RFC 4122 specification.
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