UUID Validator
Free online UUID validator to validate UUID format instantly. Check UUID v1, v4, and all versions. Verify UUID structure and format securely in your browser.
Instant Validation
Real-time UUID format check
100% Secure
Client-side only, no data sent
Version Detection
Auto-detect v1, v4, and all versions
Enter UUID with or without hyphens
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How to Validate UUID Format
Enter UUID
Type or paste your UUID into the validator. UUIDs can be entered with or without hyphens.
Automatic Validation
The validator checks UUID format, version, and structure in real-time as you type.
View Results
See validation status, UUID version, format, and length information instantly.
Verify Format
Confirm the UUID follows the correct format and passes all validation checks.
Why Use Our UUID Validator?
Development & Testing
Validate UUID formats during application development, test database schemas, and verify UUID generation logic.
API Integration
Verify UUID formats in API requests and responses, ensure proper UUID handling, and validate external system identifiers.
Data Validation
Validate UUID formats in databases, verify imported data, and check UUID consistency across systems.
Quick Verification
Quickly verify UUID format, check version compatibility, and validate identifier structure.
Frequently Asked Questions
UUID stands for Universally Unique Identifier, a 128-bit identifier used to uniquely identify information in computer systems. UUIDs are represented as 32 hexadecimal digits displayed in five groups separated by hyphens: 8-4-4-4-12 (e.g., 550e8400-e29b-41d4-a716-446655440000).
Our UUID validator supports all UUID versions including v1 (time-based), v2 (DCE security), v3 (name-based MD5), v4 (random), v5 (name-based SHA-1), and nil UUIDs. It automatically detects the version and validates the format accordingly.
Yes, completely safe. All validation happens entirely in your browser using client-side JavaScript. Your UUIDs never leave your device, are never sent to any server, and are never stored or logged anywhere.
A valid UUID must have exactly 32 hexadecimal characters arranged in the format 8-4-4-4-12 (with hyphens) or 32 characters without hyphens. The version digit (13th character) must be 1-5, and the variant bits (17th character) must be 8, 9, a, or b.
Currently, the validator validates one UUID at a time. You can paste or type a UUID and get instant validation results. For batch validation, you can validate each UUID separately.
UUID v1 uses timestamp and MAC address, v2 is DCE security variant, v3 uses MD5 hashing of namespace and name, v4 is randomly generated, and v5 uses SHA-1 hashing. Each version has different use cases and characteristics.
Key Features
Instant Validation
Real-time UUID format validation. Get immediate feedback as you type or paste UUIDs.
Version Detection
Automatically detects UUID version (v1, v2, v3, v4, v5) and validates accordingly.
100% Client-Side
All validation happens in your browser. Your UUIDs never leave your device - complete privacy guaranteed.
Format Validation
Validates UUID structure, length, hexadecimal characters, and proper formatting.
All Versions Supported
Supports UUID v1, v2, v3, v4, v5, and nil UUIDs with proper version and variant validation.
Free Unlimited Use
Completely free with no limits, registration, or hidden fees. Validate as many UUIDs as you need.
UUID Validator - Free Online UUID Format Checker
Our free online UUID validator instantly validates UUID (Universally Unique Identifier) format and structure. This powerful tool helps developers, testers, and system administrators verify UUID formats, detect versions, and ensure proper identifier structure. All validation happens entirely in your browser using client-side JavaScript, ensuring your UUIDs never leave your device.
Understanding UUID Format
A UUID is a 128-bit identifier represented as 32 hexadecimal digits displayed in five groups separated by hyphens: 8-4-4-4-12 (e.g., 550e8400-e29b-41d4-a716-446655440000). The format includes a version digit (the 13th character) that indicates the UUID version, and variant bits (the 17th character) that specify the UUID variant. Our validator checks all these components to ensure the UUID follows the correct format according to RFC 4122 standards.
UUID Versions Explained
UUIDs come in several versions, each with different characteristics:
- UUID v1: Time-based UUID generated using timestamp and MAC address
- UUID v2: DCE security variant with local domain identifier
- UUID v3: Name-based UUID using MD5 hashing of namespace and name
- UUID v4: Randomly generated UUID (most common)
- UUID v5: Name-based UUID using SHA-1 hashing of namespace and name
Our validator automatically detects the UUID version by examining the version digit and validates the format accordingly. This helps ensure UUIDs are correctly formatted for their intended use case.
UUID Validation Rules
A valid UUID must meet several criteria: it must contain exactly 32 hexadecimal characters (0-9, a-f), be arranged in the format 8-4-4-4-12 when including hyphens, have a version digit (13th character) of 1-5, and have variant bits (17th character) of 8, 9, a, or b. The validator checks all these requirements to ensure UUID format correctness. UUIDs can also be entered without hyphens, and our validator handles both formats automatically.
Security and Privacy Features
One of the key advantages of our UUID validator is complete client-side processing. All validation happens entirely in your browser using JavaScript - no data is sent to any server, stored in databases, or logged anywhere. This means your UUIDs remain completely private and secure. Whether you're validating database identifiers, checking API responses, or verifying system-generated UUIDs, you can use this tool with confidence knowing your sensitive identifiers never leave your device.
Use Cases for UUID Validation
Developers use UUID validators during application development to verify UUID formats in database schemas, test UUID generation logic, and ensure proper identifier handling. System administrators use validators to check UUID formats in logs, verify imported data, and validate external system identifiers. API developers use validators to ensure UUID formats in requests and responses meet specification requirements. Database administrators use validators to verify UUID column formats and check data consistency.
Free Online UUID Validator Tool
Swapcode's UUID validator is completely free with unlimited use and no registration required. Unlike other validators that may send your data to servers, our tool runs entirely in your browser, ensuring maximum privacy and security. The validator provides instant feedback, automatically detects UUID versions, and validates formats according to RFC 4122 standards. Whether you're a developer building applications with UUID identifiers, a tester verifying system functionality, or someone learning about UUID formats, our free online UUID validator is the perfect tool for validating UUIDs securely and instantly.
Ready to Validate UUIDs?
Start validating UUID formats instantly with our free, secure, client-side UUID validator. No registration required.
Validate UUID Now