UUID Generator

Generate RFC 4122 UUID version 4 strings with Web Crypto.

How many

Calculated Result

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Formula: UUID v4 · 122 random bits

About this calculator

A UUID v4 is 122 random bits plus a version nibble and variant bits. Use it as an id when you do not want a database sequence.

FormulaUUID v4: 122 random bits, version 4, RFC 4122 variant

crypto.getRandomValues fills 16 bytes. Byte 6 is set to version 4; byte 8 is set to the RFC 4122 variant.

Hash text with SHA-1, SHA-256, SHA-384, SHA-512, or MD5.

Beautify, minify, and validate JSON without sending it to a server.

Encode or decode UTF-8 text as RFC 4648 Base64.

Convert CSV tables to JSON objects and back.