Toolympics

🆔UUID Generator

Generate RFC 4122 compliant UUIDs instantly. Cryptographically secure, works offline.

🔄Generate UUIDs
✅UUID Validator

RFC 4122 UUID Format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

Where x is a hexadecimal digit (0-9, a-f, A-F)

ℹī¸About UUIDs

What is a UUID?

A Universally Unique Identifier (UUID) is a 128-bit number used to uniquely identify information in computer systems. UUIDs are designed to be unique across space and time.

RFC 4122 Version 4

Version 4 UUIDs are randomly generated using cryptographically secure random number generation. They provide the highest entropy and are suitable for most applications.

Common Uses

  • â€ĸ Database primary keys
  • â€ĸ API resource identifiers
  • â€ĸ Session tokens

Security

  • â€ĸ Cryptographically secure
  • â€ĸ No predictable patterns
  • â€ĸ Collision resistant

Standards

  • â€ĸ RFC 4122 compliant
  • â€ĸ 36 character format
  • â€ĸ 5 groups with hyphens
Features

🔐 Cryptographically Secure

Uses crypto.getRandomValues() for true randomness, ensuring UUIDs are genuinely unpredictable and secure.

📋 Batch Generation

Generate up to 100 UUIDs at once with a single click. Perfect for populating databases or testing.

đŸŽ¯ Multiple Formats

Choose from standard (with hyphens), compact (no hyphens), uppercase, or lowercase formats.

📤 Export Options

Export generated UUIDs as JSON arrays, CSV files, or plain text lists for easy integration.

✅ UUID Validation

Built-in validator to check if UUIDs conform to RFC 4122 standards and format requirements.

🔒 100% Private

All generation happens in your browser. No data is sent to servers, no UUIDs are stored anywhere.

How to Generate UUIDs
  1. Choose your format from the dropdown menu. Standard format (with hyphens) is recommended for most applications.
  2. Set batch size using the slider if you need multiple UUIDs (1-100).
  3. Enable auto-copy if you want UUIDs automatically copied to your clipboard.
  4. Click Generate to create cryptographically secure RFC 4122 v4 UUIDs.
  5. Copy or export the generated UUIDs using the buttons in the results section.
UUID Standards & Versions

RFC 4122 Version 4 (Random)

This generator creates Version 4 UUIDs, which are randomly generated using cryptographically secure random number generation. Version 4 UUIDs provide the highest entropy and are suitable for most applications requiring unique identifiers.

Format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

Where each x is a hexadecimal digit (0-9, a-f). The version is indicated by the 4 in the 13th position.

Other UUID Versions

Version 1: Timestamp and MAC address based
Version 3: MD5 hash of namespace and name
Version 5: SHA-1 hash of namespace and name

When to Use UUIDs

  • â€ĸ Database primary keys
  • â€ĸ Distributed system identifiers
  • â€ĸ API resource identifiers
  • â€ĸ Session tokens
  • â€ĸ File names (to avoid conflicts)
  • â€ĸ User-generated content IDs
Frequently Asked Questions

What is a UUID and why do I need one?

A UUID (Universally Unique Identifier) is a 128-bit number that provides unique identification across space and time. UUIDs are essential for creating unique identifiers in distributed systems, databases, and applications where coordination between systems isn't possible. They're particularly useful for primary keys, API resources, and any scenario requiring guaranteed uniqueness.

Are the generated UUIDs truly random and secure?

Absolutely. The UUIDs are generated using the Web Crypto API's crypto.getRandomValues() function, which provides cryptographically secure pseudorandom number generation. This is the same security level used by banks, password managers, and security-critical applications. The randomness is statistically indistinguishable from true randomness.

What is the difference between UUID versions?

Version 4 UUIDs (generated here) are randomly generated and provide the highest entropy. Version 1 uses timestamp and MAC address (not recommended for privacy). Versions 3 and 5 use hashing of namespace identifiers and names, which are deterministic (same input always produces same UUID). Version 4 is recommended for most applications requiring unique identifiers.

Does it work offline?

Yes! After the initial page load, you can generate UUIDs completely offline. All generation logic runs locally in your browser using JavaScript and the Web Crypto API. No internet connection is required once the page has loaded.

Is my data safe and private?

Completely safe and private. All UUID generation happens client-side in your browser. No data is transmitted to servers, and we don't store, log, or collect any information about the UUIDs you generate. Your privacy is guaranteed - this is a fully client-side application.

What format should I use for my application?

The standard format (with hyphens) is most widely supported and recommended for most applications. Use no-hyphens for compact storage or when hyphens aren't allowed. Uppercase is sometimes required by legacy systems, while lowercase is standard for modern web applications. All formats contain the same unique identifier.

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