About UUID / GUID Generator (v4)
Generate standard Universally Unique Identifiers (UUID v4) for database primary keys, API tokens, and mock data. Supports bulk generation (up to 500 at once) and format toggles.
Key Capabilities & Features
- Generates compliant RFC 4122 UUID v4 strings
- Bulk generate 1 to 500 UUIDs in one click
- Uppercase and lowercase formatting toggle
- Option with or without hyphens
- Copy individual UUID or entire batch list
How to Use UUID / GUID Generator (v4)
Select Quantity
Choose how many UUIDs you need (1 to 500).
Choose Formatting
Toggle uppercase/lowercase or hyphen removal.
Copy List
Click Copy All to clipboard.
Privacy & In-Browser Execution Guarantee
100% client-side crypto generation.
Frequently Asked Questions
Can two UUID v4 values ever collide?
The probability of a collision in UUID v4 is practically zero ($2^{-122}$). Generating billions of UUIDs per second for decades would still yield a negligible collision risk.
What is the difference between UUID v1, v4, and v7?
UUID v1 uses timestamps and MAC addresses; UUID v4 is pure cryptographic randomness; UUID v7 is time-ordered for optimal database B-tree indexing.
Are UUIDs safe to expose in public URLs?
Yes. UUID v4 contains no sequential data or hardware identifiers, preventing attackers from predicting neighboring record IDs or enumerating resources.