UUID Generator – Create Unique IDs (v1, v4 & v5) Free Online

Generate RFC 4122 UUIDs (Universally Unique Identifiers) in version 1, 4, or 5 format — generate one or many in bulk, copy individually or all at once.

What is this tool?

A free UUID Generator creates RFC 4122 compliant Universally Unique Identifiers — long strings that are statistically guaranteed to be unique across all systems worldwide. Developers use UUIDs as primary keys in databases, unique filenames, API tokens, and tracking IDs for distributed systems. Version 4 UUIDs are randomly generated; version 1 are time-based; version 5 use SHA-1 hashing of a namespace and name. All generation is done client-side.

How to use this tool?

1. Select the UUID version (v1 time-based, v4 random, or v5 namespace-based) 2. For v5, enter a namespace URL or DNS name and the specific name string 3. Choose how many UUIDs to generate (1–100) 4. Click "Generate" to produce the UUIDs instantly 5. Click "Copy" next to any individual UUID or "Copy All" for the full list 6. Paste the UUIDs directly into your database, code, or configuration files

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