UUID Generator

What is a UUID Generator?

A UUID (Universally Unique Identifier) generator creates 128-bit unique identifiers used to label information in computer systems. Also known as GUIDs (Globally Unique Identifiers), UUIDs are standardized identifiers that can be generated without a central registry while maintaining uniqueness across systems. Our tool generates Version 4 UUIDs using cryptographically secure random numbers, ensuring extremely low collision probability (1 in 2^122). These identifiers are perfect for database primary keys, session tracking, file names, API request IDs, and distributed systems where unique identification is critical.

How to Generate UUIDs

Select UUID Version 4 (random generation) from the version selector
Choose how many UUIDs to generate using the number input or slider (1-100)
Click the "Generate" button to create your UUIDs instantly
View the generated UUIDs in the results panel with standard hyphenated format
Click the copy icon next to any UUID to copy it to your clipboard
Use "Copy All" button to copy all generated UUIDs at once (line-separated)
Generate new UUIDs anytime by adjusting the count and clicking generate again
Each UUID is unique and follows the RFC 4122 standard format

Key Features & Benefits

Version 4 UUIDs

Generates cryptographically secure random UUIDs (Version 4) following RFC 4122 standard. Each UUID has 122 random bits ensuring uniqueness.

Bulk Generation

Generate up to 100 UUIDs at once. Perfect for database seeding, testing, or batch operations requiring multiple unique identifiers.

One-Click Copy

Copy individual UUIDs or all generated IDs with a single click. Visual confirmation shows which UUID was copied.

Standard Format

All UUIDs follow the standard 8-4-4-4-12 hexadecimal format with hyphens, compatible with all major databases and programming languages.

Client-Side Generation

UUIDs generated entirely in your browser using crypto.randomUUID() API. No server calls, ensuring privacy and speed.

No Duplicates

Uses cryptographically secure random number generator ensuring statistically zero chance of duplicate UUIDs in practice.

Common Use Cases

Database Primary Keys

Use UUIDs as primary keys in distributed databases. Unlike auto-increment IDs, UUIDs can be generated offline and merged without conflicts.

API Development

Generate request IDs, transaction IDs, or correlation IDs for API calls. Track requests across microservices and distributed systems.

File & Document IDs

Create unique identifiers for uploaded files, documents, or media. Prevents naming conflicts and enables content-addressed storage.

Session Management

Generate session IDs for user authentication systems. UUIDs are unpredictable and secure for session tracking.

Testing & Development

Generate test data, mock IDs, or placeholder identifiers during development. Bulk generation speeds up database seeding.

Distributed Systems

Create globally unique identifiers across multiple servers without coordination. Essential for microservices and cloud applications.

Why Choose Our UUID Generator

✓RFC 4122 Compliant: Generates standard Version 4 UUIDs compatible with all major databases and frameworks.
✓Cryptographically Secure: Uses crypto.randomUUID() API for secure random generation - not pseudo-random.
✓Bulk Generation: Create up to 100 UUIDs at once - perfect for database seeding or batch operations.
✓Instant Results: Client-side generation means zero latency - UUIDs appear immediately.
✓Copy Flexibility: Copy individual UUIDs or all at once with visual confirmation.
✓Zero Storage: No UUIDs are stored or logged - complete privacy for your generated identifiers.
✓No Rate Limits: Generate unlimited UUIDs without restrictions, throttling, or accounts.
✓Standard Format: 8-4-4-4-12 hexadecimal format with hyphens - universally recognized.
✓Developer Friendly: Clean, simple interface perfect for quick UUID generation during development.
✓Always Free: Unlimited UUID generation forever with no premium tiers or feature locks.

Frequently Asked Questions

What is the difference between UUID and GUID?

UUID (Universally Unique Identifier) and GUID (Globally Unique Identifier) are essentially the same thing - 128-bit identifiers following the same RFC 4122 standard. "GUID" is primarily used in Microsoft technologies, while "UUID" is the standard term everywhere else. Our generator creates identifiers compatible with both naming conventions.

Can two UUIDs ever be the same?

While theoretically possible, the probability of generating duplicate Version 4 UUIDs is astronomically low - approximately 1 in 2^122 (5.3 x 10^36). You would need to generate billions of UUIDs per second for millions of years to have a 50% chance of a collision. For practical purposes, UUIDs are considered unique.

What is Version 4 UUID and why use it?

Version 4 UUIDs use random numbers for all 122 bits (6 bits are reserved for version/variant). This makes them the most common UUID type because they're simple to generate, don't require MAC addresses or timestamps, and provide excellent uniqueness guarantees. Perfect for most use cases.

Are the generated UUIDs secure for sensitive applications?

Yes, our tool uses the crypto.randomUUID() browser API which generates cryptographically secure random numbers. This makes the UUIDs unpredictable and suitable for security-sensitive applications like session tokens, though you should still follow security best practices for your specific use case.

Can I use these UUIDs as database primary keys?

Absolutely! UUIDs are excellent for distributed database primary keys because they can be generated client-side without database coordination. However, note that UUID primary keys are larger than integers (16 bytes vs 4-8 bytes) and may impact performance in very large tables. Many modern databases have optimized UUID support.

What format are the generated UUIDs?

All generated UUIDs follow the standard 8-4-4-4-12 format with hyphens, like: 550e8400-e29b-41d4-a716-446655440000. This is the canonical textual representation compatible with all major programming languages (JavaScript, Python, Java, C#, etc.) and databases (PostgreSQL, MySQL, MongoDB, etc.).

Do you store or log the generated UUIDs?

No. All UUID generation happens entirely in your browser using client-side JavaScript. We never receive, store, or log any generated UUIDs. Your identifiers are completely private.

Can I generate UUIDs without hyphens?

Currently, our tool outputs UUIDs in the standard hyphenated format. You can easily remove hyphens in your code using string replacement: uuid.replace(/-/g, '') in JavaScript. Some databases and libraries also accept both formats.

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