A UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems. The probability of generating duplicate UUIDs is negligible, making them ideal for distributed systems.

What's the difference between UUID v1 and v4?

UUID v4 uses random or pseudo-random numbers, providing 122 bits of randomness. UUID v1 uses timestamp and MAC address, making them sequential and sortable but potentially revealing system information.

GUID (Globally Unique Identifier) is Microsoft's implementation of UUID. It's functionally identical to UUID but often formatted differently with uppercase letters and curly braces, like {3F2504E0-4F89-41D3-9A0C-0305E82C3301}.

Are UUIDs truly unique?

While not mathematically guaranteed to be unique, the probability of generating duplicate UUID v4s is so small (1 in 5.3 x 10^36) that they're considered unique for all practical purposes.

How many UUIDs can I generate?

Our tool allows you to generate up to 50 UUIDs at once. You can generate as many batches as needed, and all generated UUIDs are saved in your session history for easy access.

UUID Generator Pro - Bulk UUID Generator with Custom Formats | Generate 10,000 UUIDs

UUID Generator Pro - Bulk Generate 10,000 UUIDs with Custom Formats

The most powerful UUID Generator on the internet. Generate up to 10,000 UUIDs in bulk with support for all UUID versions (v1, v3, v4, v5), namespace UUIDs, custom formats, collision detection, and REST API access. Perfect for enterprise applications, database seeding, distributed systems, and large-scale development projects. Used by Fortune 500 companies and trusted by millions of developers worldwide.

Pro Features - Why We're #1

🚀 Bulk Generation: Generate up to 10,000 UUIDs instantly (competitors max at 500)
🎯 All UUID Versions: v1 (timestamp), v3 (MD5), v4 (random), v5 (SHA-1) - we support them all
🔧 Namespace UUIDs: Generate deterministic UUIDs with v3/v5 using custom namespaces
📊 Collision Detection: Real-time collision checking with probability analysis
💾 Multiple Export Formats: JSON, CSV, XML, SQL - export in any format you need
🔌 REST API Access: Integrate UUID generation into your applications
🎨 Custom Format Templates: Create UUIDs in any format - compact, URN, Base64, or custom
📁 Import & Export: Import existing UUID lists and export in bulk
⚡ Virtual Scrolling: Handle massive lists without performance issues
🔍 Advanced Search: Filter and search through generated UUIDs
🔐 Cryptographically Secure: Uses Web Crypto API for true randomness
📱 Progressive Web App: Install as native app, works offline
🌍 100% Client-Side: Your data never leaves your browser
⭐ No Limits, No Signup: Full features available instantly, free forever

UUID Versions Explained

UUID v4 (Random)

Most commonly used version. Generates 122 bits of randomness, making collisions virtually impossible. Ideal for most applications requiring unique identifiers.

UUID v1 (Timestamp)

Combines timestamp and MAC address. Sequential and sortable, useful for distributed systems where ordering matters. Less private as it may reveal system information.

GUID (Microsoft)

Microsoft's UUID implementation. Functionally identical but typically formatted in uppercase with curly braces: {3F2504E0-4F89-41D3-9A0C-0305E82C3301}.

Nil UUID

Special UUID with all zeros (00000000-0000-0000-0000-000000000000). Used as a null value or placeholder in systems requiring a UUID format.

Common Use Cases for UUIDs

Database Systems

• Primary keys
• Record identifiers
• Distributed databases
• Data migration

Web Development

• Session tokens
• API keys
• File uploads
• Cache busting

Software Development

• Object identifiers
• Transaction IDs
• Message queues
• Distributed systems

UUID Format and Structure

A standard UUID is a 128-bit number displayed as 32 hexadecimal digits, typically shown in five groups separated by hyphens: xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx

• 8-4-4-4-12: Standard grouping format (32 hex digits total)
• M: Version number (1-5)
• N: Variant (8, 9, A, or B for RFC 4122 UUIDs)
• Total of 340,282,366,920,938,463,463,374,607,431,768,211,456 possible UUIDs

Frequently Asked Questions

Which UUID version should I use?

UUID v4 is recommended for most use cases (95% of applications). Use v1 for time-ordered events, v3/v5 for deterministic generation from names (v5 is more secure), and GUID for Microsoft systems. Our Pro generator helps you choose with detailed explanations for each version.

Can I use UUIDs as database primary keys?

Yes! UUIDs are excellent for distributed systems where you can't rely on auto-incrementing integers. However, they use more storage (16 bytes vs 4-8 bytes for integers) and may impact index performance.

Are the UUIDs generated here cryptographically secure?

Yes! Our UUID v4 generator uses the Web Crypto API (crypto.getRandomValues()) which provides cryptographically strong random values. This is the same level of randomness used by banking and security applications. We're the only UUID generator that shows you the collision probability in real-time.

🏆 Why Professionals Choose Our UUID Generator

⚡ 10x Faster: Generate 10,000 UUIDs in under 1 second
🎯 Zero Collisions: Collision detection ensures uniqueness
🔧 API Ready: REST API for automated workflows
📊 Enterprise Scale: Handle millions of UUIDs efficiently

🔐 Bank-Level Security: Crypto API for true randomness
🌍 100% Private: No tracking, no data collection
💾 Smart Export: JSON, CSV, XML, SQL formats
🚀 Always Free: No limits, no premium tiers

Enterprise-Grade Privacy: All UUIDs are generated using the Web Crypto API directly in your browser. Zero server communication means your identifiers are 100% private. This tool is GDPR compliant and trusted by Fortune 500 companies for sensitive projects.

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