UUID Generator
Generate v4 UUIDs for your applications.
About UUID Generator
The GuruAlpha UUID Generator creates Version 4 universally unique identifiers (UUIDs) — 128-bit random strings formatted as 8-4-4-4-12 hexadecimal characters. UUIDs are used as unique IDs for database records, API resources, session tokens, transaction identifiers and any application that needs guaranteed-unique identifiers without a central authority.
UUIDs solve a fundamental problem in distributed computing: how to generate identifiers that are guaranteed unique across multiple systems without coordination. A Version 4 UUID uses 122 bits of randomness, providing 2^122 (approximately 5.3 × 10^36) possible values. The probability of generating two identical UUIDs is so small that it is practically zero — you would need to generate 1 billion UUIDs per second for 85 years to have a 50% chance of a single collision.
The tool generates UUIDs in the standard format: 550e8400-e29b-41d4-a716-446655440000. This format includes hyphens for readability but the hyphens can be removed for use in contexts that don't support them. The tool can output UUIDs with or without hyphens, in uppercase or lowercase, and as plain text or JSON-formatted strings.
For batch operations, the tool generates up to 100 UUIDs at once. This is useful for populating test databases, generating session tokens for load testing, and creating unique identifiers for batch data imports. Each UUID in the batch is guaranteed to be unique within the batch and unique relative to any previously generated UUID.
The tool uses the Web Crypto API for UUID generation, ensuring cryptographic randomness. This is important for security-sensitive applications where predictability could be exploited — for example, session tokens, API keys and one-time identifiers. The browser-based generation means no UUIDs are stored or transmitted to servers.
Key Features of UUID Generator
- Generate Version 4 UUIDs with cryptographic randomness
- Batch generation up to 100 UUIDs
- Hyphenated and unhyphenated formats
- Uppercase and lowercase options
- JSON-formatted output
- Copy individual or batch UUIDs
- Browser-based for privacy
- Uses Web Crypto API for security
How to Use UUID Generator
- Open the UUID Generator on GuruAlpha.
- Click 'Generate' to create a single UUID.
- Or set the quantity to generate multiple UUIDs at once.
- Choose format: hyphenated, unhyphenated, uppercase, lowercase.
- Copy the UUID(s) to your clipboard.
- Use in your database, API or application code.
Tips for Using UUID Generator
- Use UUIDs for primary keys in distributed databases to avoid ID collisions.
- Generate batch UUIDs for populating test databases quickly.
- Use unhyphenated format for contexts that don't support special characters.
- JSON format is useful for API payloads and configuration files.
- UUIDs are cryptographically random, making them suitable for security tokens.
Frequently Asked Questions About UUID Generator
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 8-4-4-4-12 hex characters. Version 4 UUIDs are random, providing practically guaranteed uniqueness.
Can two UUIDs be the same?
Theoretically yes, but practically impossible. With 2^122 possible values, the probability of collision is less than 1 in 10^18.
What is Version 4?
Version 4 UUIDs are generated using random numbers. Other versions use timestamps, MAC addresses or other sources. Version 4 is most common for general-purpose unique IDs.
Is this suitable for session tokens?
Yes. Version 4 UUIDs provide cryptographic randomness, making them suitable for session tokens, API keys and other security-sensitive identifiers.