Enter UUID with or without hyphens
Validation Result:
UUID Version:
Format:
Length:
UUID Validator
How It Works
- Step 1: Paste UUID string in standard format (8-4-4-4-12 hexadecimal pattern) like "550e8400-e29b-41d4-a716-446655440000" or without hyphens for validation.
- Step 2: The validator checks UUID format verifying 36-character length (with hyphens), correct hyphen positions (after 8th, 12th, 16th, 20th characters), and hexadecimal digit validity (0-9, a-f).
- Step 3: Identifies UUID version (v1: timestamp-based, v4: random, v5: SHA-1 hash) by examining version field (13th character) and variant field (17th character).
- Step 4: Provides validation result with UUID version, variant type (RFC 4122), timestamp extraction (for v1), and format recommendations for database storage or API usage.
Manual vs Automated UUID Validation
| Feature | Manual Verification | AI-Powered Validator |
|---|---|---|
| Format Checking | Count characters and hyphens manually | Instant 8-4-4-4-12 format validation |
| Version Detection | Look up 13th character in spec | Auto-detects v1, v2, v3, v4, v5 |
| Hex Validation | Manually check each character is 0-9, a-f | Validates all 32 hexadecimal digits |
| Variant Checking | Read RFC 4122 for variant bits | Automatically verifies RFC 4122 compliance |
| Timestamp Extraction | Complex bit manipulation for v1 UUIDs | Extracts timestamp from v1 UUIDs instantly |
| Batch Validation | Validate one UUID at a time manually | Quick validation for multiple UUIDs |
UUID Validation Examples
Example: UUID Format Validation
Valid UUIDs:
550e8400-e29b-41d4-a716-446655440000
6ba7b810-9dad-11d1-80b4-00c04fd430c8
f47ac10b-58cc-4372-a567-0e02b2c3d479
Invalid UUIDs:
550e8400-e29b-41d4-a716-44665544000 (too short)
550e8400-e29b-41d4-a716-446655440000g (invalid character 'g')
550e8400e29b41d4a716446655440000 (missing hyphens)
550e8400-e29b-51d4-a716-446655440000 (invalid version)Validation Results:
✅ VALID: 550e8400-e29b-41d4-a716-446655440000
Version: 4 (Random)
Variant: RFC 4122
Format: Canonical (8-4-4-4-12)
Use Case: Primary keys, session IDs, unique identifiers
✅ VALID: 6ba7b810-9dad-11d1-80b4-00c04fd430c8
Version: 1 (Timestamp-based)
Variant: RFC 4122
Timestamp: 1997-02-03 17:43:12.207 UTC
Node: 00:c0:4f:d4:30:c8 (MAC address)
Use Case: Sortable IDs, distributed systems
✅ VALID: f47ac10b-58cc-4372-a567-0e02b2c3d479
Version: 4 (Random)
Variant: RFC 4122
Format: Canonical (8-4-4-4-12)
Entropy: 122 bits (collision probability: ~10^-36)
❌ INVALID: 550e8400-e29b-41d4-a716-44665544000
Error: Incorrect length (35 characters, expected 36)
Missing: 1 character in last segment
Fix: Add missing digit to match 8-4-4-4-12 pattern
❌ INVALID: 550e8400-e29b-41d4-a716-446655440000g
Error: Invalid hexadecimal character 'g'
Location: Position 37
Fix: Use only 0-9, a-f characters
❌ INVALID: 550e8400e29b41d4a716446655440000
Error: Missing hyphens
Format: Compact (32 hex digits)
Fix: Insert hyphens at positions 8, 13, 18, 23
Corrected: 550e8400-e29b-41d4-a716-446655440000
❌ INVALID: 550e8400-e29b-51d4-a716-446655440000
Error: Invalid version number '5' at position 15
Valid Versions: 1 (timestamp), 3 (MD5), 4 (random), 5 (SHA-1)
Note: Version 5 requires specific variant bits
Summary:
Valid UUIDs: 3
Invalid UUIDs: 4
Most Common Error: Format violations (length, hyphens)
Recommended Version: v4 (random) for general useKey Changes:
The validator enforces RFC 4122 UUID format specification, checking the 8-4-4-4-12 hexadecimal pattern (36 characters including hyphens). Version identification examines the 13th character (version field)—'4' indicates random UUID (v4), '1' indicates timestamp-based (v1). The variant field (17th character) must be '8', '9', 'a', or 'b' for RFC 4122 compliance. UUID v1 includes timestamp and MAC address, enabling extraction of creation time and node identifier—useful for distributed systems requiring sortable IDs. UUID v4 uses random generation with 122 bits of entropy, providing collision probability of ~10^-36 (effectively zero for practical purposes). The validator catches common errors: missing hyphens (compact format), incorrect length (typos), invalid characters (non-hexadecimal), and wrong version numbers. Database systems (PostgreSQL, MySQL) have native UUID types requiring valid format. APIs use UUIDs for resource identifiers, session tokens, and idempotency keys. The validator ensures UUIDs meet format requirements before database insertion or API transmission, preventing validation errors in production.
Frequently Asked Questions
What is a UUID?
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).
What UUID versions does the validator support?
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.
Is my UUID data safe when using this validator?
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.
What makes a UUID valid?
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.
Can I validate multiple UUIDs at once?
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.
What is the difference between UUID versions?
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.