UUID Generator Online
Generate random UUID v4 and time-ordered UUID v7 identifiers conforming to RFC 4122 and RFC 9562.
Quick Answer & Understanding Your Result
A UUID (Universally Unique Identifier) Generator generates 128-bit globally unique identifiers formatted as 32 hexadecimal digits separated by hyphens (8-4-4-4-12 structure) conforming to RFC 4122 and RFC 9562.
Differences Between UUID Versions
- UUID v4 (Random): 122 bits of cryptographically secure pseudorandom entropy (2^{122} approx 5.3 × 10^{36} unique combinations; collision probability is negligible).
- UUID v7 (Time-Ordered): Encodes a 48-bit UNIX millisecond t×tamp in the high bits followed by random entropy, optimizing B-tree database index performance.
- UUID v1 (T×tamp + MAC): Legacy format based on hardware MAC address and 100ns clock intervals.
Formatting Options Supported
- Hyphenated / Compact:
550e8400-e29b-41d4-a716-446655440000vs550e8400e29b41d4a716446655440000. - Case Sensitivity: Uppercase for SQL constants, lowercase for JSON keys.
Select your version and quantity above to generate cryptographically secure UUIDs instantly.
Formula & Calculation Logic
Technical Specification & ASTUses crypto.getRandomValues() Web Crypto API for cryptographically secure pseudo-random numbers (CSPRNG).
Step-by-Step Guide
Select UUID Version
Choose Version 4 (Random) or Version 7 (Time-Ordered).
Choose Quantity & Format
Select quantity (1 to 500), uppercase/lowercase, and hyphens.
1-Click Copy or Download
Copy generated UUIDs to clipboard or export as text.
Worked Examples Table
| Example | Input Values | Calculated Result | Explanation |
|---|---|---|---|
| Standard RFC 4122 UUID v4 | Digit 13 is '4' (version); digit 17 starts with 'a' (variant 1). | ||
| UUID v7 (Time-Ordered for Databases) | Provides instant quantitative evaluation for comparative practical analysis. |
Frequently Asked Questions
Evidence-Based Methodology & Authoritative References
IETF RFC 9562 - Universally Unique IDentifiers (UUID)
W3C Web Cryptography API
Standard: ISO / W3C / IETF Authoritative Domain Standard
Formula: UUID Format = xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx (where y is 8, 9, a, or b)
Last Reviewed: August 21, 2026
Primary Source: IETF RFC 9562 - Universally Unique IDentifiers (UUID)
Reference Document: W3C Web Cryptography API
Computation Privacy: 100% client-side 0ms computation, zero data retention
All algorithms, formatters, and data conversions run 100% locally in your browser following official technical standards (RFC, ISO, W3C). Output should be verified prior to mission-critical production deployment.
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Calculated results are modeled based on standard scientific and mathematical formulas. Please verify with domain-specific technical documentation for specialized applications.