UUID / GUID Generator
Generate cryptographically secure Version-4 UUIDs and GUIDs individually or in batch with custom formatting.
Client-side calculations and instant parameter controls are initializing. All processing occurs securely in your browser.
How to Use the UUID / GUID Generator
- 1 Choose the number of UUIDs to generate (1 to 100).
- 2 Toggle uppercase/lowercase, hyphens, or braces formatting.
- 3 Copy individual UUIDs or download the entire batch as a .txt file.
Mathematical Formula & Principle
RFC 4122 Version 4 UUID = 128-bit Cryptographically Random Binary
Calculations are performed with IEEE floating point mathematical precision directly in your device memory.
Worked Examples
Standard Version 4 UUID
Generates 122 bits of unpredictable entropy compliant with RFC 4122.
Frequently Asked Questions
- What is the difference between a UUID and a GUID?
- UUID (Universally Unique Identifier) and GUID (Globally Unique Identifier) refer to the same 128-bit identifier standard. Microsoft historically used the term GUID.
Related Developer Tools Utilities
View All in Developer Tools →Generate cryptographic hash digests including SHA-256, SHA-512, SHA-384, and SHA-1 using native Web Crypto APIs.
Password GeneratorGenerate strong, cryptographically secure passwords using native Web Crypto APIs with custom entropy rules.
JSON Formatter & ValidatorBeautify, format, minify, and validate JSON data with syntax error detection and copy/download tools.
Base64 Encoder & DecoderEncode text and files to Base64 or decode Base64 data with full UTF-8 character support.
Markdown Editor & Live PreviewWrite Markdown with instant live HTML preview, code block highlighting, and 1-click export to HTML or .md file.
URL Encoder & DecoderEncode and decode URLs and URI query parameters with instant structural parameter breakdown table.