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Generate RFC 4122 compliant UUIDs (v4 and v1-style) in bulk. Copy individually or all at once as JSON or plain text. 100% browser-side.
Click Generate to create UUIDs
Select a version and count above
Two UUID versions, bulk generation, flexible copy options — all running privately in your browser.
Generate RFC 4122 v4 UUIDs using crypto.randomUUID() — the gold standard for unique identifiers. 122 bits of cryptographic randomness.
Simulate time-based UUIDs using high-resolution timestamps and random node IDs. Useful for time-sortable identifiers without exposing MAC addresses.
Generate 1, 5, 10, 25, or 50 UUIDs in a single click. Perfect for seeding databases, creating test fixtures, or populating lookup tables.
Copy any individual UUID with a single click. Each row has its own copy button that confirms with a checkmark for instant visual feedback.
Export all generated UUIDs as a formatted JSON array with one click. Ready to paste directly into your code, config files, or API payloads.
All UUID generation uses browser-native crypto APIs. Nothing leaves your device. No tracking, no logging, no server calls — completely private.
A UUID (Universally Unique Identifier) is a 128-bit identifier defined by RFC 4122, represented as 32 hex digits in the format 8-4-4-4-12. They are used as database primary keys, session tokens, API request IDs, file names, and anywhere a unique ID is needed without a central registry. The collision probability is so low that UUIDs are considered practically unique.
UUID v4 is fully random — 122 bits of cryptographic randomness. It is the most widely used format today because it is private and simple. UUID v1 incorporates a timestamp and the machine's MAC address, making it time-sortable but potentially exposing privacy information. The v1-style UUIDs generated here use a timestamp plus a random node component instead of an actual MAC address.
Yes. V4 UUIDs use crypto.randomUUID(), which relies on the browser's cryptographically secure pseudo-random number generator (CSPRNG). The v1-style UUIDs use Date.now() for the timestamp portion and crypto.getRandomValues() for the node. All processing is done entirely in your browser — nothing is sent to any server.
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