UUID Validator
Validate UUID format, detect version (v1-v5), and generate new UUIDs. Bulk validate multiple UUIDs at once. Process data securely in your browser with no information transmitted to external servers..
Generate UUIDs
What is UUID Validator | Rune
UUID Validator checks whether a string is a valid UUID (Universally Unique Identifier) and identifies its version (v1 through v5) and variant. It accepts standard formatted UUIDs, GUIDs with curly braces, UUIDs without dashes, and urn:uuid: prefixed strings.
Includes bulk validation for checking multiple UUIDs at once and a generator that creates cryptographically random v4 UUIDs. Perfect for developers working with databases, APIs, and distributed systems. Implements industry-standard cryptographic algorithms and security protocols for reliable results. All security operations run locally in your browser, ensuring sensitive data never leaves your device.
Key Features of UUID Validator
Everything you need for professional uuid validator
Format Validation
Validates UUID format with support for standard, no-dash, curly-brace, and urn:uuid: formats.
Version Detection
Identifies UUID version (v1 time-based, v3 MD5, v4 random, v5 SHA-1) and variant (RFC 4122, NCS, Microsoft).
Bulk Validation
Paste multiple UUIDs to validate them all at once with per-line results and a validity summary.
UUID Generator
Generate 1-100 cryptographically random v4 UUIDs using the Web Crypto API.
Copy Results
Copy individual UUIDs or all generated UUIDs to clipboard with one click.
Client-Side Only
All validation and generation happens in your browser. No data is sent to any server.
How to Use UUID Validator
Follow these simple steps to get started
Enter UUID
Paste a UUID to validate, or switch to bulk mode to check multiple UUIDs at once.
View Results
See if the UUID is valid, its version, variant, and normalized format instantly.
Generate New
Use the generator to create new v4 UUIDs and copy them for use in your project.
Pro Tips
- UUID v4 (random) is the most commonly used version. It provides 122 bits of randomness with negligible collision probability.
- UUIDs are case-insensitive, '550E8400' and '550e8400' represent the same UUID.
- The version is encoded in the 13th hex digit (first digit of the third group) of the UUID.
- For database primary keys, v4 UUIDs work well but consider v7 (time-ordered) for better index performance.
Explore More Tools
Discover other powerful tools to boost your productivity
Frequently Asked Questions
Everything you need to know about UUID Validator
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 32 hex digits in 5 groups: 8-4-4-4-12. UUIDs are designed to be unique across space and time without a central registry.
What are the different UUID versions?
v1: Time + MAC address. v2: DCE Security. v3: MD5 hash of namespace+name. v4: Random. v5: SHA-1 hash of namespace+name. v4 is the most commonly used.
Is UUID the same as GUID?
Yes, essentially. GUID (Globally Unique Identifier) is Microsoft's term for UUID. They follow the same RFC 4122 standard and are interchangeable.
Can this tool detect the UUID version?
Yes. The tool identifies the version (v1-v5) from the version nibble and the variant from the variant bits in the UUID.
What formats are supported?
Standard (8-4-4-4-12), no dashes (32 hex chars), curly braces ({...}), and urn:uuid: prefix. All are automatically normalized.
How many UUIDs can I generate at once?
Up to 100 UUIDs at a time. All are generated using crypto.randomUUID() which provides cryptographically secure random v4 UUIDs.
Is this tool free?
Yes, completely free with no limits. Validate and generate as many UUIDs as you need.
Can two UUIDs ever be the same?
Theoretically yes, but the probability is astronomically low. A v4 UUID has 2^122 possible values, you'd need to generate billions per second for centuries to have a meaningful chance of collision.
Still need help?
Can't find what you're looking for? Our support team is here to assist you.
Contact Support