Developer Tools
UUID Generator: Create Random v4 UUIDs
Generate one or many UUID v4 identifiers.
What is this tool?
Need unique IDs for database rows, test fixtures, or API requests? This generator creates version 4 UUIDs with your browser’s cryptographically secure random number generator, in batches of up to 500.
UUID version 4 identifiers are 122 bits of randomness (plus version/variant bits). Collision risk for typical applications is negligible.
ToolForge uses the Web Crypto randomUUID API when available.
How to use the UUID Generator
- Choose how many UUIDs you want (up to 500).
- Click Generate.
- Copy individual values or the full list.
Examples
Sample UUID v4
550e8400-e29b-41d4-a716-446655440000
Frequently asked questions
Are these UUIDs sequential?
No. UUID v4 values are random and should not be treated as sortable timestamps.
What is the difference between a UUID and a GUID?
They are the same thing. GUID is Microsoft’s name for the UUID standard, and the formats are interchangeable.
Can two generated UUIDs collide?
In practice, no. A v4 UUID has 122 random bits, so you would need to generate billions of IDs every second for many years before a collision became likely.
Want more power later?
Premium tools, higher limits, and API access are on the roadmap. V1 stays free and private in your browser.