UUID Generator (v4)
About this Tool
Generate Version 4 UUIDs (Universally Unique Identifiers), which are random, 128-bit numbers used to uniquely identify information in computer systems. This tool addresses the need for collision-resistant IDs in databases, sessions, or distributed systems.
How does it work? It uses crypto.randomUUID() to generate a random 128-bit value, formatted as 8-4-4-4-12 hex digits.
- Click the "Generate UUID" button.
- A new, random UUID will be generated and displayed.
- Click the "Copy" button to copy the UUID to your clipboard.
- Assigning unique keys to database records.
- Generating session IDs for web apps.
- Tagging files in content management systems.
- Generates cryptographically strong random UUIDs (v4).
- Uses the browser's built-in `crypto.randomUUID()` method for security.
- Simple one-click generation and copying.
UUIDs follow RFC 4122, with v4 being random. The concept relies on vast 128-bit space (3.4e38 possibilities) for near-zero collision probability, enabling decentralized ID generation.
Is v4 truly unique?
Practically yes, with extremely low collision risk.
Can I generate multiple?
Yes, click generate repeatedly.
What about other versions?
This focuses on v4; others like v1 use timestamps.
All calculations and data processing for this tool are performed locally in your browser. We do not send any of your data to our servers, ensuring your information remains private and secure.