Developer Tools
UUID Generator
Generate cryptographically random v4 UUIDs instantly. Supports bulk generation, uppercase, and no-dash formats.
Usage notes
- Uses crypto.randomUUID() — cryptographically secure.
- UUID v4 has 122 bits of randomness (2¹²² ≈ 5.3 × 10³⁶ possible values).
- Generate up to 100 UUIDs at once.
How to Use This Tool
- 1Set how many UUIDs to generate (1-100).
- 2Optionally enable uppercase or remove dashes.
- 3Click 'Generate' to create UUIDs.
- 4Click 'Copy' on any UUID, or 'Copy All' for the full list.
Frequently Asked Questions
- What is a UUID?
- A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 32 hexadecimal digits in 5 groups: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx. The '4' indicates version 4 (random).
- Are v4 UUIDs truly unique?
- Statistically, yes. The probability of generating two identical v4 UUIDs is astronomically low — you'd need to generate 1 billion UUIDs per second for 85 years to have a 50% chance of a single collision.
- UUID vs GUID — what's the difference?
- They're the same thing. UUID is the standard term (RFC 4122). GUID (Globally Unique Identifier) is Microsoft's name for the same concept.
- When should I use UUIDs?
- Use them as database primary keys, API resource identifiers, session tokens, correlation IDs for distributed systems, and anywhere you need a unique identifier without a central authority.