Built for Developers

Fast, flexible UUID generation for any workflow.

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Up to 10,000 UUIDs

Generate up to 10,000 unique UUIDs at once. All generated instantly in your browser — no server needed.

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v1, v4, v5 Support

Random (v4), time-based (v1), and namespace/name-based (v5) UUIDs with SHA-1 hashing.

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Flexible Formatting

Uppercase, lowercase, with/without hyphens, curly braces. Comma, newline, or tab separation.

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TXT & CSV Export

Download your UUIDs as plain text or CSV with index numbers for easy import into databases.

Frequently Asked Questions

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify objects in computer systems. They are commonly used as database primary keys, session IDs, and API tokens. The standard format is 8-4-4-4-12 hexadecimal characters separated by hyphens.

What's the difference between v1, v4, and v5?

v4 UUIDs are purely random — best for most use cases. v1 UUIDs encode the current timestamp and MAC address. v5 UUIDs are deterministic: given the same namespace and name, they always produce the same UUID using SHA-1 hashing.

Are these UUIDs truly unique?

v4 UUIDs use cryptographically secure random numbers (crypto.randomUUID where available, otherwise Math.random). The probability of a collision is astronomically small — approximately 1 in 5.3 × 10³⁶.

Can I use these in production?

Yes. The v4 generator uses the browser's crypto API for strong randomness. v5 uses a deterministic SHA-1 implementation. Both produce standard RFC 4122 compliant UUIDs.

UUID Generator — Complete Guide

A UUID (Universally Unique Identifier) generator creates random, globally unique 128-bit identifiers used in software development for database keys, session tokens, API identifiers, and distributed system components that need unique IDs.

🗄️ Database primary keys

Use UUIDs as primary keys in databases instead of sequential IDs — preventing ID enumeration attacks and enabling safe data merging from multiple sources.

🔑 Session tokens

Generate unique session identifiers for user authentication systems — the probability of collision is astronomically low, making UUIDs ideal for security tokens.

🔄 Distributed systems

In microservices and distributed databases, UUIDs allow independent nodes to create unique IDs without coordination — eliminating bottlenecks in high-scale systems.

📦 Asset tracking

Assign UUIDs to files, uploads, products, and digital assets for reliable tracking and retrieval in content management and e-commerce systems.

UUID v4 (the most common type) uses 122 random bits to generate an identifier like 550e8400-e29b-41d4-a716-446655440000. With 2^122 possible values, the probability of generating a duplicate is so low it's considered practically impossible — making UUIDs the gold standard for unique identifier generation in software systems.

UUID BulkGenerator