🆔 Generate UUIDs
UUID Generator — Free, Instant Unique IDs
Generate UUID (Universally Unique Identifier) v4 strings instantly — for free, with no account required. Generate a single UUID or bulk-generate hundreds at once. UUIDs are essential in software development for identifying database records, API resources, session tokens, and distributed system components. A UUID (also called GUID in Microsoft contexts) is a 128-bit identifier formatted...
Generate UUID (Universally Unique Identifier) v4 strings instantly — for free, with no account required. Generate a single UUID or bulk-generate hundreds at once. UUIDs are essential in software development for identifying database records, API resources, session tokens, and distributed system components.
A UUID (also called GUID in Microsoft contexts) is a 128-bit identifier formatted as 32 hexadecimal characters in 5 groups: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. Version 4 UUIDs are randomly generated, making the probability of collision astronomically small — practical uniqueness is guaranteed even across distributed systems.
When to Use UUIDs
- Database primary keys: Use instead of auto-incrementing integers to avoid sequential ID exposure
- API resource IDs: REST APIs commonly use UUIDs as resource identifiers
- Session tokens: Generate unique session identifiers for user authentication
- File naming: Create collision-free unique filenames for uploads
- Distributed systems: Generate IDs across multiple servers without coordination
How to Generate a UUID — Step by Step
- Click Generate: Click "Generate UUID" to create a new UUID v4 instantly.
- Copy: Click "Copy" to copy the UUID to your clipboard.
- Bulk generate: Enter a number and click "Bulk Generate" for multiple UUIDs at once.
- Format options: Choose between standard UUID format, uppercase, or without hyphens.
- Use in code: Paste directly into your code, database, or configuration.
❓ Frequently Asked Questions
UUID v4 is a randomly generated universally unique identifier. Unlike v1 (time-based) or v5 (name-based), v4 is generated from random numbers, making it ideal for most use cases.
In practice, no. The probability of generating a duplicate UUID v4 is astronomically small — roughly 1 in 5.3 × 10^36. They are considered practically unique.
They are the same thing. GUID (Globally Unique Identifier) is Microsoft's term for UUID, following the same standard and format.
Yes — UUIDs are commonly used as primary keys, especially in distributed systems. Note that random UUID v4 keys can fragment database indexes; consider UUID v7 (time-ordered) for high-performance scenarios.
Yes, 100% free with no account required.
Yes — they use your browser's cryptographically secure random number generator (crypto.getRandomValues) for high-quality randomness.
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