UUID Generator guide
UUID Generator Description
Generate various versions of UUIDs (v1, v4, v6, v7) online. A UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems.
Features
Multiple Versions: Support for v1 (Time), v4 (Random), v6 (Sortable v1), and v7 (Time-ordered).
Batch Generation: Create up to 100 UUIDs at once to meet large-scale requirements.
Formatting Options: Customize output with uppercase/lowercase and with/without hyphens.
CSPRNG Security: Uses cryptographically secure random number generators for high collision resistance.
How to Use
1
Select the UUID version (v4 is recommended for general use).
2
Choose the quantity and formatting options (e.g., lowercase, with hyphens).
3
Click Example (Demo) to see how different versions look.
4
Click Generate to create your unique IDs.
5
Copy the results to your clipboard or download them.
FAQ
Q. Which version should I use?
v4 is best for general uniqueness; v7 is best for database primary keys.
Q. Can they collide?
The probability is extremely low—practically zero in standard application scenarios.
Use Cases
- Database Primary Keys: Using UUID v7 as a sortable, unique index for database records.
- Session Management: Generating unique identifiers for user sessions or tokens.
- Mock Data: Creating unique IDs for testing and UI prototyping.
Technical Deep Dive
A UUID consists of 32 hexadecimal digits separated by hyphens. v4 is purely random, while v7 incorporates a timestamp into the first bits, making it naturally sortable and more efficient for database indexing.
Limitations
- UUID v1 and v6 include the generation time; use v4 if you want to avoid leaking any timestamp info.
3M
Reviewed by Tool3M Editorial Team
Updated April 25, 2026