Free UUID Generator Online
Generate UUID v4 (random) identifiers instantly. Bulk generate up to 100 UUIDs with options for uppercase, lowercase, and with or without dashes.
About UUID v4
Format
xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
The "4" indicates version 4 (random). "y" is one of: 8, 9, a, b.
Uniqueness
122 bits of randomness. Probability of collision generating 1 billion UUIDs/sec for 85 years: ~50%.
Usage
Database primary keys, session IDs, correlation IDs, distributed systems, file naming.
How to Use
- Click Generate to create a new UUID v4 (or press Space/Enter)
- Click Copy to copy the UUID to your clipboard
- Toggle options: uppercase, without dashes, with braces, or with quotes
- For bulk generation, set a quantity (1-100), choose a separator format, and click Generate Bulk
- Hover over individual UUIDs in the bulk list to copy them one by one
- Use Copy All to copy all bulk UUIDs with your chosen separator
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