A UUID (Universally Unique Identifier) is a 128-bit identifier standardized by the Open Software Foundation. It's used to uniquely identify information in computer systems. The standard format is 36 characters (32 hexadecimal digits and 4 hyphens), like 123e4567-e89b-12d3-a456-426614174000.

What's the difference between UUID versions?

UUID v1 uses timestamp and MAC address, UUID v3 uses MD5 hash of namespace and name, UUID v4 uses random numbers, and UUID v5 uses SHA1 hash of namespace and name. v4 is most common for general use, while v1 is useful for time-ordered sequences.

How does the UUID Generator work?

Select the UUID version you need (v1, v3, v4, v5) and click Generate. For v3 and v5, provide a namespace and name. The tool creates cryptographically strong random UUIDs (v4) or deterministic UUIDs based on your input (v3/v5).

Can I generate multiple UUIDs at once?

Yes, use the bulk generation feature to create up to 100 UUIDs at once. Perfect for testing, seeding databases, or generating multiple identifiers quickly.

How do I validate if a string is a valid UUID?

Paste the UUID into the validator to check its format and version. The tool verifies the structure, hyphen placement, hexadecimal characters, and version bits according to RFC 4122 standards.

What formats can I generate UUIDs in?

Choose from standard hyphenated format (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx), no hyphens, uppercase, lowercase, base64 encoded, or wrapped in curly braces for GUID compatibility.

Is the UUID Generator free to use?

Yes, the UUID Generator on Easy Tools HQ is completely free and works directly in your browser with no registration required. All generation is done locally.

UUID Generator

Q: What namespaces can I use for v3 and v5 UUIDs?

Common predefined namespaces include DNS (6ba7b810-9dad-11d1-80b4-00c04fd430c8), URL (6ba7b811-9dad-11d1-80b4-00c04fd430c8), OID (6ba7b812-9dad-11d1-80b4-00c04fd430c8), and X.500 (6ba7b814-9dad-11d1-80b4-00c04fd430c8). You can also use custom namespaces.

Generate UUID v1, v3, v4, v5 and GUID for your applications

Universally Unique Identifiers (UUIDs) are essential for database keys, API endpoints, distributed systems, and more. Our UUID Generator supports all major versions (v1, v3, v4, v5) with multiple output formats, bulk generation, and validation — all securely in your browser.

How to Use the UUID Generator

Our UUID Generator makes it easy to create unique identifiers for your applications. Here's how to use it:

Select a version – Choose from UUID v1 (time-based), v3 (MD5 namespace), v4 (random), or v5 (SHA1 namespace).
Generate a UUID – Click "Generate UUID" to create a single UUID. Click "New" on the display card to refresh it.
Choose output format – Select from standard (with hyphens), no hyphens, braces, or uppercase.
Generate multiple – Use the bulk generation feature to create up to 100 UUIDs at once.
Use namespaces (v3/v5) – For v3 and v5 UUIDs, select a predefined namespace or enter a custom UUID.
Validate UUIDs – Paste any UUID into the validator to check its format and version.
Copy or download – Copy individual UUIDs or download all generated UUIDs as a text file.

All Versions

v1, v3, v4, v5 support

Bulk Generation

Up to 100 at once

Validation

Check UUID format

Copy & Download

Export results

UUID Version

Random

Fully random UUID

Time-based

Timestamp + MAC address

MD5 Namespace

MD5 hash of namespace

SHA1 Namespace

SHA-1 hash of namespace

Generated UUID

550e8400-e29b-41d4-a716-446655440000

Version: 4 Variant: RFC 4122 Generated: Just now

Format

Standard (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)

No hyphens (32 characters)

With braces {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}

Uppercase

Namespace

DNS (6ba7b810-9dad-11d1-80b4-00c04fd430c8)

URL (6ba7b811-9dad-11d1-80b4-00c04fd430c8)

OID (6ba7b812-9dad-11d1-80b4-00c04fd430c8)

X.500 (6ba7b814-9dad-11d1-80b4-00c04fd430c8)

Custom namespace

Bulk Generation

Number of UUIDs:

Generate unique only

Generated UUIDs

UUID Validator

UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information. v4 is randomly generated, v1 uses timestamp, v3/v5 use namespace and name hashing.

UUID Generation Disclaimer

The UUID Generator provided by Easy Tools HQ is for development, testing, and general identification purposes only. All UUID generation is performed locally in your browser using JavaScript's `Math.random()` or simplified implementations.

Important limitations: This tool uses JavaScript's `Math.random()` which is NOT cryptographically secure. Generated UUIDs should NOT be used for:

Security tokens, session identifiers, or password reset links
Cryptographic keys or sensitive authentication
Any application requiring unpredictable random values
Production systems requiring RFC-compliant UUID generation

Version implementation notes:

UUID v1 (time-based): This is a simplified implementation. Real v1 UUIDs require MAC address and precise timestamp tracking.
UUID v3/v5 (namespace-based): These are simulated implementations. Real v3/v5 require proper MD5/SHA-1 hashing algorithms.
UUID v4 (random): Uses `Math.random()` which is not cryptographically secure. Real v4 should use secure random number generators.

Collision probability: While UUIDs are designed to be unique, the simplified implementations in this tool may have higher collision probability than proper UUID generators. Do not rely on these UUIDs for uniqueness in critical systems without additional verification.

Production recommendation: For production systems, use:

Node.js: `crypto.randomUUID()` (v4) or `uuid` npm package
Python: `uuid` module from standard library
Java: `java.util.UUID` class
.NET: `Guid.NewGuid()`
Databases: Built-in UUID functions (PostgreSQL, MySQL, etc.)

RFC 4122 compliance: This tool aims to generate UUIDs that follow the RFC 4122 format, but the implementations are simplified and may not be fully compliant. Always verify UUID format and uniqueness in your specific environment.

Last Updated: March 2026

Not cryptographically secure • Testing only