GUID Generator
Generate random, cryptographically secure 128-bit Microsoft GUIDs and UUID v4 identifiers with customizable braces and hyphens.
Quick Answer & Understanding Your Result
A GUID Generator produces cryptographically secure 128-bit Globally Unique Identifiers (GUIDs) conforming to Microsoft COM standards and RFC 9562 UUID v4 specifications.
Anatomy of a 128-Bit GUID
- Standard 8-4-4-4-12 Hex Format: Formatted as 32 hexadecimal digits separated by hyphens (e.g.
xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx). - Cryptographic Randomness (122 Entropy Bits): Uses
crypto.getRandomValues()to eliminate collision probability (1 in 2^{122}). - Formatting Options: Supports uppercase/lowercase, registry braces (
{...}), base64 encoded GUIDs, and SQL GUID constants (NEWID()).
Enterprise & Microsoft Ecosystem Uses
- Database Primary Keys: Generating unique row identifiers for Microsoft SQL Server and Azure Cosmos DB.
- COM & Windows Registry Entries: Generating component class IDs (CLSID) and interface identifiers (IID).
Click generate above to create single or bulk batches of unique GUIDs instantly.
Formula & Calculation Logic
Technical Specification & ASTEntropy generation:
- Generates 16 random bytes (128 bits), sets version bits to 0100 (v4), and variant bits to 10xx (RFC 9562).
Step-by-Step Guide
Choose Quantity & Format
Select the number of GUIDs and toggle uppercase or braces.
Deterministic Cryptographic Generation
The engine produces cryptographically random 128-bit GUIDs in 0ms.
1-Click Copy GUIDs
Copy single or batch GUID lists directly into your clipboard.
Worked Examples Table
| Example | Input Values | Calculated Result | Explanation |
|---|---|---|---|
| Standard Registry GUID | Generated uppercase GUID enclosed in Windows registry braces. | ||
| 10x UUID v7 (Time-Ordered Database Primary Keys) | Provides instant quantitative evaluation for comparative practical analysis. |
Frequently Asked Questions
Evidence-Based Methodology & Authoritative References
IETF RFC 9562 - Universally Unique IDentifiers (UUID)
Microsoft Learn - Guid Structure (.NET)
Standard: ISO / W3C / IETF Authoritative Domain Standard
Formula: GUID Format = xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
Last Reviewed: August 21, 2026
Primary Source: IETF RFC 9562 - Universally Unique IDentifiers (UUID)
Reference Document: Microsoft Learn - Guid Structure (.NET)
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.