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The work in itself is all; if it pleases you, my good reader, I am paid for the task;
if you don't like it, I'll pay you with a flick, and goodbye.
– Machado de Assis

This wiki is being rewritten from scratch.

Visit the new pages for utilities and codecs.

Recommended readings

• What is a UUID? (watch the video)
• How to Do UUID as Primary Keys the Right Way
• The Wild World of Unique Identifiers (UUID, ULID, etc)
• Random UUID as a Primary Key in the Relational Database
• Analyzing New Unique Identifier Formats (UUIDv6, UUIDv7, and UUIDv8)
• Do you intend to use UUID as PK instead of Int/BigInt in your database? Think again... (in Portuguese)

Recommended videos

• Generating Unique Identifiers in Your Programs (GUIDs/UUIDs)