UUID Generator
Generate cryptographically secure UUID v4, v1, and v7 identifiers in bulk with custom formatting options.
UUID Generator
Generate cryptographically secure RFC-compliant UUID v4 and v7 identifiers.
Educational Purpose Disclaimer
This calculator is provided for informational and educational estimation purposes only. All calculations and projections are based on standard mathematical formulas and assumed inputs. The output values should not be considered professional financial, legal, tax, or medical advice. ProCalc is not a registered financial advisor or licensed practitioner. Always consult a qualified professional (such as a Chartered Accountant, certified planner, or physician) before making major decisions.
What is the UUID Generator?
The UUID Generator is a fast, cryptographically secure tool for generating Universally Unique Identifiers (UUIDs) conforming to RFC 4122 and RFC 9562 standards. A UUID is a 128-bit number used in software architecture to identify database records, API request IDs, microservice transactions, and session tokens without requiring a central authority.
Our generator supports all major UUID versions, including UUID v4 (random), UUID v1 (timestamp-based), and UUID v7 (time-ordered, highly optimized for database primary keys).
Supported UUID Versions
- UUID v4 (Random): Generated using Web Crypto API `crypto.getRandomValues()` for maximum entropy. 122 bits of randomness yields a collision probability so low it is statistically impossible.
- UUID v7 (Time-Ordered): Combines a 48-bit Unix epoch millisecond timestamp with 74 random bits. Highly recommended for database primary keys (PostgreSQL, MySQL, SQLite) to prevent index fragmentation.
- UUID v1 (Timestamp + Node): Uses MAC address/node representation and high-resolution time offset.
Key Features
- Bulk Generation: Generate up to 100 UUIDs in a single click.
- Formatting Options: Toggle Uppercase vs Lowercase, and include or strip hyphens (`-`).
- One-Click Copy & Export: Copy all generated UUIDs as raw text, CSV, or JSON array.
- Zero Collision Risk: Uses cryptographically secure pseudorandom number generators (CSPRNG).
How Does the UUID Generator Work?
1. Select UUID Version: Choose v4 (Random), v7 (Time-Ordered), or v1 (Timestamp).
2. Set Quantity: Choose how many UUIDs to generate (1 to 100).
3. Customize Format: Toggle Uppercase or Strip Hyphens if needed.
4. Click Generate: Instant generation directly in your browser.
5. Copy / Download: Copy all to clipboard or download as text file.
Formula & Calculation Method
UUID v4 Structure:
`xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx`
- 128 bits total: 122 random bits, 4 version bits (`4`), 2 variant bits (`y` is 8, 9, a, or b).
UUID v7 Structure:
`tttttttt-tttt-7xxx-yxxx-xxxxxxxxxxxx`
- First 48 bits = Unix timestamp in milliseconds.
- Version = `7`.
- Remaining 74 bits = CSPRNG random data.
Example Calculation
Sample UUID v4:
`f47ac10b-58cc-4372-a567-0e02b2c3d479`
- Version: 4 (Random)
- Variant: RFC 4122
- Entropy: $2^{122} \approx 5.3 \times 10^{36}$ possible combinations
Frequently Asked Questions
**UUID v4 Structure:** `xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx` - 128 bits total: 122 random bits, 4 version bits (`4`), 2 variant bits (`y` is 8, 9, a, or b). **UUID v7 Structure:** `tttttttt-tttt-7xxx-yxxx-xxxxxxxxxxxx` - First 48 bits = Unix timestamp in milliseconds. - Version = `7`. - Remaining 74 bits = CSPRNG random data.
Disclaimer: This tool is provided for informational and calculation purposes. Output values are estimates based on standard user inputs.