UUID GENERATOR
Generate RFC 4122 compliant UUIDs instantly
Everything runs locally in your browser. Your data never leaves your device - no uploads, no servers, no data transmission.
All processing happens directly on your machine using JavaScript. Close the tab and all data is released.
UUID Version
Generation analytics
How to use UUID generator
Generate secure, RFC 4122 compliant UUIDs in seconds
Full Documentation DocsSelect version
Choose UUID version (v1, v4, v5, v7, v8)
Set options
Choose count and format preferences
Generate & use
Copy or download your UUIDs
Why choose this UUID generator?
5 versions (v1/v4/v5/v7/v8), crypto.getRandomValues(), batch 1-100,000, 5 format options, collision detection
Cryptographically secure
Uses crypto.getRandomValues() for v4/v7/v8, not Math.random(). Bank-grade randomness.
Multiple versions
Support for UUID v1, v4, v5, v7 (time-ordered), and v8 (custom payload).
Bulk generation
Generate up to 100,000 UUIDs at once with built-in collision detection.
5 flexible formats
Output with hyphens, braces {}, quotes "", commas, and uppercase/lowercase options for any coding style.
Validation built-in
Automatic validation and collision detection for every generated batch.
One-click copy
Instantly copy generated UUIDs to clipboard. Export as TXT for integration with databases, APIs, and configuration files.
Frequently Asked Questions
Everything you need to know about UUIDs
What is a UUID?
UUID (Universally Unique Identifier) is a 128-bit identifier standardized by RFC 4122. It's used to uniquely identify information without central coordination.
What's the difference between UUID versions?
v1 uses timestamp + MAC address, v4 is purely random, v5 is name-based with SHA-1, v7 uses Unix timestamp for better sorting, v8 allows custom data.
Are generated UUIDs cryptographically secure?
Yes. This tool uses crypto.getRandomValues() for v4, v7, v8 generation, not Math.random(). This ensures cryptographic quality randomness.
Can I generate multiple UUIDs at once?
Yes. You can generate 1 to 100,000 UUIDs in one batch with built-in collision detection. Copy all to clipboard or export as TXT.
What output formats are supported?
Standard hyphenated, uppercase or lowercase, with or without hyphens, with or without braces {}, with quotes, with commas. Export as plain text TXT file.
Is UUID the same as GUID?
Yes. GUID (Globally Unique Identifier) is Microsoft's term for UUID. They are functionally identical 128-bit identifiers.
Is my data safe?
All UUID generation runs locally in the browser using JavaScript. No UUIDs are transmitted to any server. Close the tab and all data is released.
Technical Details
Under the hood of this UUID generator
UUID Standards & Versions
This UUID generator implements RFC 4122 compliant identifiers across versions 1, 4, 5, 7, and 8. Version 4 UUIDs use 122 bits of randomness from the browser's CSPRNG, producing identifiers in the canonical 8-4-4-4-12 hexadecimal format. Each version serves a distinct purpose - v1 for timestamp-based, v5 for namespace-derived SHA-1, v4 for purely random, v7 for sortable Unix timestamp (RFC 9562), and v8 for custom payload.
Collision Probability
UUID v4 offers a keyspace of 2^122 possible values (5.3 x 10^36 unique identifiers). The probability of generating a duplicate UUID requires approximately 2.71 x 10^18 identifiers before reaching a 50% collision chance. For practical applications, this makes UUID v4 collision virtually impossible even at billions of generations per second.
Generation Algorithm
The random UUID generator uses crypto.getRandomValues() - a cryptographically secure pseudo-random number generator (CSPRNG) built into modern browsers. This ensures unpredictable output suitable for security tokens, session IDs, and database primary keys. No server communication occurs during generation - all processing runs client-side in your browser.
Output Formats & Batch Generation
Generate UUID identifiers in bulk - up to 100,000 UUIDs per batch with 5 configurable format toggles: hyphens on/off, braces {}, uppercase/lowercase, quotes, and commas. Export results as TXT for direct integration with databases, APIs, and configuration files. The batch UUID generator processes all identifiers in a single operation with O(n) time complexity and built-in collision detection.