🔑 UUID Generator

Generate unique identifiers (UUIDs/GUIDs) instantly

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Generate Multiple UUIDs
Click "Generate Bulk" to create multiple UUIDs...

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit identifier standardized by RFC 4122. UUIDs are designed to be unique across all space and time without requiring a central registration authority.

The standard format is xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx where each x is a hexadecimal digit. This gives 2128 possible UUIDs (over 340 undecillion).

GUID (Globally Unique Identifier) is Microsoft's implementation of UUID. They are functionally identical.

UUID Versions

Version Name Description
v1TimestampBased on timestamp and MAC address
v3MD5 HashNamespace + name hashed with MD5
v4RandomRandomly generated (this tool uses v4)
v5SHA-1 HashNamespace + name hashed with SHA-1
v7Unix TimestampTime-ordered with Unix timestamp

This tool generates Version 4 (random) UUIDs using cryptographically secure random numbers.

Common Use Cases

🗄️ Database Primary Keys

Use UUIDs instead of auto-incrementing integers for distributed databases, data merging, and security (IDs aren't guessable).

🔌 API Identifiers

Identify resources in REST APIs without exposing sequential IDs. Perfect for user IDs, session tokens, and resource references.

📁 File Naming

Generate unique filenames for uploads, temp files, and cache entries without collision risk.

🔗 Distributed Systems

Create IDs across multiple servers without coordination. Essential for microservices and event sourcing.

Frequently Asked Questions

What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier that is guaranteed to be unique across all space and time. UUIDs are used in databases, APIs, and distributed systems to identify resources without coordination.
What's the difference between UUID and GUID?
UUID and GUID are essentially the same thing. GUID (Globally Unique Identifier) is Microsoft's implementation of the UUID standard. Both follow the same format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
Are the generated UUIDs truly unique?
Yes! Version 4 UUIDs are generated using cryptographically secure random numbers. The probability of generating a duplicate is astronomically low—about 1 in 5.3 × 1036.
Can I generate UUIDs in bulk?
Yes! Enter the number of UUIDs you need (up to 1000) and click "Generate Bulk". All UUIDs are generated instantly in your browser and can be copied or downloaded.
What format options are available?
Standard (lowercase with hyphens), UPPERCASE, No Hyphens, {Braces} (for .NET), and URN format (urn:uuid:...).

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🔒 100% Private

All UUIDs are generated locally in your browser using cryptographically secure randomization. Nothing is ever sent to any server. Generate as many unique identifiers as you need with complete privacy.