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Developer Tools
Free online tool
Generate cryptographically random RFC 4122 Version 4 Universally Unique Identifiers directly in your browser.
Tool workspace
Paste or enter the data you want to process, then run the tool.
Generating database primary keys, distributed transaction trace IDs, test fixtures and mock API records.
Version 4 UUIDs use 122 bits of cryptographic entropy, making the mathematical probability of a duplicate virtually negligible.
A UUID serves solely as an identifier; it does not encrypt data, establish trust or provide authentication authority by itself.
How to use it
Use the controls above, check the result, then copy or download it when available.
With 122 random bits, generating billions of UUIDs per second for decades would still yield a near-zero collision probability.
Use this tool whenever you need: Generating database primary keys, distributed transaction trace IDs, test fixtures and mock API records. It offers a fast, client-side workflow without sign-ups, installation or complex software.
Yes. All processing executes locally in your browser using client-side JavaScript. Your inputs, files and calculations remain private and are never uploaded to our servers.
Version 4 UUIDs use 122 bits of cryptographic entropy, making the mathematical probability of a duplicate virtually negligible. Important note: A UUID serves solely as an identifier; it does not encrypt data, establish trust or provide authentication authority by itself.
Related
Create cryptographically random UUID v4 values locally in your browser. Choose how many you need, then copy one or all.
Generated results
Choose a quantity and generate your UUIDs
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Generation starts only when you press the button, so the page stays hydration-safe and predictable.
Generated locally with your browser's built-in cryptographic UUID generator. Nothing is uploaded.
Local processing