UUID Generator

Universally unique.

Probably.

Batch
0 UUIDs generated
No upload
Works offline
No idea what's in your data

Need offline UUID generation? The offline bundle works without internet. $99 once.

Get Bundle →
// How it works

Three steps. Zero uploads.

01
Generate
Click generate or load the page. A cryptographically random UUID v4 is created on your device.
02
Format
Choose standard, no dashes, or uppercase. Generate in batch — 5, 10, 25, or 100 at a time.
03
Copy
Click to copy a single UUID or copy all from a batch. Nothing leaves your browser.
// Why this is different

Generated entirely on your device.

Most online UUID generators make a server request to generate each UUID. fwip uses the Web Crypto API to generate cryptographically random UUIDs entirely in your browser — no network request, no logging.

fwip works differently. The processing engine runs entirely in your browser. Your identifier is read from your device, processed on your CPU, and the result is saved back to your device. No server is involved. We literally cannot see your file.

No server processing

Everything runs on your device using WebAssembly. Your file never touches a network.

No account required

Drop a file. Get a result. No sign-up, no email, no password.

No subscription

Free in the browser. $99 once for the offline bundle. That's it. Forever.

Works offline

The desktop version works with no internet connection at all.

// How fwip compares

fwip vs the rest.

fwipUUIDGenerator.netOnline UUID ToolsUUIDTools.com
Upload requiredNoYesYesYes
Account requiredNoNoNoNo
Price$15 / toolFreeFreeFree
Files leave deviceNeverAlwaysAlwaysAlways
Works offlineYesNoNoNo
Batch processingOffline bundleYesYesYes
// Questions

Frequently asked.

What is a UUID v4?▾
UUID v4 (Universally Unique Identifier version 4) is a 128-bit identifier generated using random or pseudo-random numbers. The format is 8-4-4-4-12 hex digits, e.g. 550e8400-e29b-41d4-a716-446655440000. The "4" in the third group indicates version 4.
How random are these UUIDs?▾
fwip uses crypto.randomUUID() backed by the Web Crypto API, which provides cryptographically secure random numbers. The probability of generating two identical UUIDs is astronomically low — about 1 in 5.3 × 10³⁶.
Can I use these UUIDs in production?▾
Yes. UUIDs generated by the Web Crypto API are suitable for production use as database primary keys, correlation IDs, session tokens, and any other purpose requiring unique identifiers.
What is the difference between UUID versions?▾
UUID v1 uses timestamp + MAC address, v3 uses MD5 hash of a namespace, v4 uses random numbers, and v5 uses SHA-1 hash of a namespace. v4 is the most commonly used because it requires no input and is simple to generate.
Are these UUIDs truly unique?▾
Statistically, yes. With 122 random bits, you would need to generate about 2.7 quintillion UUIDs to have a 50% chance of a collision. In practice, UUID v4 collisions do not occur.
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