UUID Validator Tool
Validate and analyze UUIDs with detailed format checking
Single UUID Validation
Bulk Validation
About UUID Validation
UUID validation is essential for ensuring data integrity in applications that use Universally Unique Identifiers. Our free online UUID validator helps developers, database administrators, and system architects verify UUID format compliance, detect version information, and identify common issues that could cause problems in distributed systems.
Why UUID Validation Matters
Data Integrity
Valid UUIDs ensure that database relationships, API calls, and distributed system communications work correctly without unexpected failures due to malformed identifiers.
Security
Malformed UUIDs can sometimes be exploited in injection attacks. Validation helps prevent security vulnerabilities in your applications.
Debugging
When UUID-related issues occur, validation helps quickly identify whether the problem is with the UUID format or elsewhere in the system.
Interoperability
Valid UUIDs ensure smooth data exchange between different systems, programming languages, and databases that might have varying UUID implementation details.
UUID Format Specifications
A standard UUID is a 128-bit value represented as 32 hexadecimal digits, displayed in five groups separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters (32 alphanumeric characters and 4 hyphens).
123e4567-e89b-12d3-a456-426614174000
Version Identification
The version number is encoded in the most significant 4 bits of the 7th byte (the first character of the third group). For example, in UUID 123e4567-e89b-12d3-a456-426614174000, the version is 1.
Variant Field
The variant field determines the layout of the UUID. The most significant bits of the 8th byte indicate the variant (10xxxxxx for the standard variant used by most systems).
Common UUID Validation Issues
Incorrect length: UUIDs must be exactly 36 characters (32 hex digits + 4 hyphens) or 32 characters if hyphens are omitted.
Invalid characters: UUIDs can only contain hexadecimal characters (0-9, a-f, A-F) and hyphens in the correct positions.
Misplaced hyphens: Hyphens must appear at positions 9, 14, 19, and 24 (counting from 1) in the 36-character representation.
Invalid version: The version number must be between 1 and 5 (or 7-8 for some special cases).
Invalid variant: The variant field must comply with RFC 4122 specifications.
How to Use This UUID Validator
- Enter a single UUID in the input field or multiple UUIDs (one per line) for bulk validation
- Choose whether to detect the UUID version (enabled by default)
- Click "Validate UUID" or "Validate All" to check your UUIDs
- Review the validation results including status, version, and any issues found
- Use the information to fix invalid UUIDs in your system
Frequently Asked Questions
What is a UUID validator used for?
A UUID validator checks if a string conforms to the UUID format specification, verifies its version, and identifies any formatting issues. It's essential for data validation in applications that work with UUIDs.
What versions of UUID does this validator support?
Our validator supports all standard UUID versions: v1 (time-based), v3 (MD5 hash), v4 (random), and v5 (SHA-1 hash). It can detect the version from the UUID's structure.
Can I validate multiple UUIDs at once?
Yes, our tool includes a bulk validation feature that allows you to validate multiple UUIDs simultaneously. Simply enter one UUID per line in the bulk validation section.
What common UUID format issues does this tool detect?
The validator detects issues like incorrect length, invalid characters, misplaced hyphens, wrong version indicators, and variant field errors. It provides specific feedback for each issue found.
Is my data secure when using this validator?
Yes, all validation happens in your browser. Your UUIDs are never sent to our servers, ensuring complete privacy and security for your data.