UUID Validator
Validate UUID and GUID strings online for free. Our validator checks against RFC 4122 and RFC 9562 specifications for correct 8-4-4-4-12 hex format, version nibble (v1-v8), variant bits, nil/max UUID detection, duplicate checking, and multiple input formats including braced, URN, and compact.
Enter one or more UUID strings (one per line) to validate against RFC 4122 and RFC 9562 specifications. Checks hex format, version nibble, variant bits, hyphen placement, and detects nil/max UUIDs, duplicates, and multiple input formats.
Why Use Our UUID Validator?
Instant Validation
Our tool to validate uuid analyzes your content instantly in your browser. Validate UUID files of any size with zero wait time — get detailed error reports with line numbers in milliseconds.
Secure & Private Processing
Your data never leaves your browser when you use our uuid validator online tool. Everything is processed locally using JavaScript, ensuring complete privacy and security for sensitive configuration data.
No File Size Limits
Validate large UUID files without restrictions. Our free UUID Validator handles any size input — from small configs to massive files with thousands of entries.
100% Free Forever
Use our UUID Validator completely free with no limitations. No signup required, no hidden fees, no premium tiers, no ads — just unlimited, free validation whenever you need it. The best free uuid validator online available.
Common Use Cases for UUID Validator
Database Primary Keys
Validate UUIDs used as primary keys in databases. Ensure correct format before inserting records to prevent data integrity errors in PostgreSQL, MongoDB, or any UUID-compatible database.
API Request Validation
Validate UUID parameters in REST API requests and responses. Verify resource identifiers, correlation IDs, and session tokens conform to RFC 4122 standards before processing.
Session & Token Management
Validate UUIDs used as session identifiers, CSRF tokens, or authentication tokens. Confirm that randomly generated UUIDs (v4) have proper version and variant bits set.
Data Migration Auditing
Validate UUID formats when migrating data between systems. Detect format inconsistencies, duplicate identifiers, invalid hex characters, and wrong hyphen placement across large datasets.
Log & Trace Correlation
Validate trace IDs and correlation IDs in distributed systems. Ensure UUIDs in log entries, OpenTelemetry spans, and request tracing follow the expected RFC 4122 format.
Microservice Integration
Validate UUIDs exchanged between microservices. Check that message queue IDs, event IDs, and entity references use consistent UUID versions and proper formatting across services.
Understanding UUID Validation
What is UUID Validation?
UUID validation is the process of checking Universally Unique Identifier (RFC 4122 / RFC 9562) files (.txt) for syntax errors, structural issues, invalid values, duplicate keys, and specification compliance — helping you catch problems before deployment. UUID is widely used for providing globally unique identifiers without a central registration authority through a standardised 128-bit format expressed as 32 hexadecimal digits grouped in 8-4-4-4-12 sections with version and variant bits encoding generation method information. Our free uuid validator online tool checks your content instantly in your browser. Whether you need to validate uuid for database primary keys, API resource identifiers, session tokens, distributed system correlation IDs, message queue event IDs, microservice entity references, data migration auditing, and log trace correlation, our tool finds errors accurately and privately.
How Our uuid validator Works
- Input Your UUID Content: Paste your UUID content directly into the text area or upload a
.txtfile from your device. Our uuid validator online tool accepts any UUID input. - Instant Browser-Based Validation: Click the "Validate UUID" button. Our tool analyzes your content entirely in your browser — no data is sent to any server, ensuring complete privacy.
- Review Detailed Error Reports: View a comprehensive list of errors with line numbers, descriptions, and severity levels. Fix issues with pinpoint accuracy using our clear error messages.
What Gets Validated
- Syntax Correctness: Checks for proper syntax including balanced brackets, correct string quoting, valid escape sequences, and proper key-value pair formatting.
- Data Types: Validates integers, floats, booleans, strings, datetimes, arrays, and inline tables conform to the UUID specification.
- Structural Integrity: Detects duplicate keys, conflicting table definitions, invalid table headers, and malformed sections.
- Line-by-Line Reporting: Every error includes its exact line number and a clear description, making it easy to find and fix issues in your UUID files.
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Frequently Asked Questions - uuid validator
A uuid validator is a tool that checks UUID files for syntax errors, structural issues, invalid values, and specification compliance. Our uuid validator online tool processes everything in your browser — giving you instant error reports with line numbers and clear descriptions.
Our uuid validator detects syntax errors (missing brackets, incorrect quoting), structural issues (duplicate keys, conflicting table definitions), invalid data types (malformed numbers, dates, strings), invalid escape sequences, and specification violations. Each error includes its exact line number for easy debugging.
Absolutely! Your data is completely secure. All validation happens directly in your browser using JavaScript — no data is ever uploaded to any server. Your configuration files, secrets, and sensitive data never leave your device.
Yes, our uuid validator is 100% free with absolutely no hidden costs or limitations. There's no signup required, no premium tier, no usage limits, no file size restrictions, and no advertisements. Use it unlimited times for any project.
Yes! Our uuid validator online tool handles files of any size. Since all processing happens in your browser, performance depends on your device, but modern browsers handle even very large UUID files efficiently.
A UUID (Universally Unique Identifier) is a 128-bit identifier standardised by RFC 4122 and RFC 9562. It is represented as 32 hexadecimal digits grouped in 8-4-4-4-12 format with hyphens (e.g., 550e8400-e29b-41d4-a716-446655440000). UUIDs are also known as GUIDs (Globally Unique Identifiers).
RFC 4122 defines versions 1-5: v1 (time-based), v2 (DCE Security), v3 (MD5 name-based), v4 (random), and v5 (SHA-1 name-based). RFC 9562 adds v6 (reordered time-based), v7 (Unix epoch time-based), and v8 (custom). Version 4 (random) is the most commonly used.
Variant bits (the first bits of the 4th group) identify the UUID layout. RFC 4122 / RFC 9562 UUIDs use variant 1 (10xx binary, hex digits 8-b). Variant 0 is for NCS backward compatibility, variant 2 for Microsoft COM/DCOM, and variant 3 is reserved for future use.
UUID and GUID refer to the same concept. UUID (Universally Unique Identifier) is the standard term from RFC 4122, while GUID (Globally Unique Identifier) is Microsoft's terminology. Both follow the same 8-4-4-4-12 hexadecimal format.
The validator supports four UUID input formats: standard (8-4-4-4-12 with hyphens), braced ({...}), URN-prefixed (urn:uuid:...), and compact (32 hex digits without hyphens). All formats are normalised and validated against the same rules.