Generate random UUID v4 identifiers instantly. Cryptographically secure, bulk generation up to 100 UUIDs, multiple formats. 100% free, no signup required.
Click Generate to create UUIDs
UUIDs are generated using cryptographically secure random values (UUID v4)
The fastest and most secure way to generate UUIDs online. Perfect for developers and teams.
Uses crypto.randomUUID() for truly random, secure UUID generation.
Generate single or bulk UUIDs instantly with zero latency.
One-click copy to clipboard for individual or all generated UUIDs.
Standard, uppercase, no dashes, and bracketed formats available.
Generate up to 100 UUIDs at once for batch operations.
All generation happens in your browser. No data sent anywhere.
Everything you need to know about Universally Unique Identifiers
A UUID is a 128-bit identifier displayed as 32 hexadecimal digits in five groups:
xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxxWhere M indicates the version (4 for random) and N indicates the variant (8, 9, A, or B for RFC 4122).
v1: Time-based with MAC address (exposes information)
v3: Name-based using MD5 hash
v4: Random (most commonly used, what we generate)
v5: Name-based using SHA-1 hash
v7: Time-ordered with random (newer standard)
See how Edesy compares to other online UUID generators
| Feature | Edesy | Others |
|---|---|---|
| Free to use | ||
| No signup required | ||
| Bulk generation | ||
| Multiple formats | ||
| Client-side only | ||
| Copy all at once | ||
| Works offline | ||
| Mobile friendly |
UUIDs are ideal when you need unique identifiers without central coordination. Use them for distributed systems, database primary keys in sharded databases, public-facing IDs (so users cannot enumerate records), session tokens, and correlation IDs in microservices architectures.
Auto-increment IDs are smaller (4-8 bytes vs 16 bytes) and may have better index performance. However, UUIDs can be generated without database access, work across distributed systems, do not expose record counts, and enable offline creation. Choose based on your specific requirements.
Most languages have built-in UUID support. In JavaScript, use crypto.randomUUID(). In Python, use uuid.uuid4(). In Java, use UUID.randomUUID(). For production systems, always use these built-in functions rather than external services to ensure security and reliability.
While UUIDs are typically displayed as 36-character strings, you can store them more efficiently as 16-byte binary (BINARY(16) in MySQL, BYTEA in PostgreSQL). Some databases have native UUID types. For URLs, consider Base62 encoding to create shorter representations.
UUID v4 is suitable for security-sensitive applications when generated with cryptographically secure random number generators. Never use predictable UUIDs for session tokens or API keys. Our generator uses the Web Crypto API, ensuring cryptographic security for all generated UUIDs.
Generate cryptographically secure UUIDs
UUID v4 (random) format
Bulk generation (up to 100 at once)
Multiple formats (standard, uppercase, no dashes)
Copy individual or all UUIDs to clipboard
Remove individual UUIDs from list
Download UUIDs as text file
100% client-side generation
No data sent to servers
Works offline after page load
Instant generation
No signup required
Generate unique primary keys for database records, entities, and distributed systems.
Create unique request IDs, session tokens, correlation IDs, and API keys.
Generate test data with unique identifiers for development and quality assurance.
Create unique file names to avoid collisions in uploads and storage systems.
Generate IDs that are unique across multiple servers without coordination.
Create unique tracking IDs for events, sessions, and user interactions.
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