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MondayKit

Developer tools

UUID generator – random v4 UUIDs and GUIDs

Create one or up to 50 random version-4 UUIDs and copy them. Generated securely on your device, never stored.

  • No uploadYour files are processed on your device and never sent anywhere.
  • FastNo upload or download wait – results appear in seconds.
  • Free, no signupNo account, no watermark and no daily limit.
UUID generator

Processed in your browser. Files are never uploaded.

1 to 50

  • 72c69eda-bb52-452f-aff4-40228f7aace2
  • 066fffc7-9338-4320-9bc4-c818ad95478b
  • 60aa9b20-83b5-497f-84da-adf94dc080d1
  • 28022dda-a7f0-469f-bc6f-7dab4345f141
  • 5642a347-9d05-41db-855e-d575a2912911

How to use the uuid generator

  1. Choose how many UUIDs you need (up to 50).

  2. Click Generate.

  3. Copy one or copy them all.

  • No uploadYour files are processed on your device and never sent anywhere.
  • FastNo upload or download wait – results appear in seconds.
  • Free, no signupNo account, no watermark and no daily limit.

Generate random UUIDs (v4)

Choose how many you need and click Generate to get random version-4 UUIDs, also called GUIDs. Copy one, or copy the whole list. Use them as database keys, request IDs, file names or test data. They come from your browser’s cryptographic random generator and are never stored or sent anywhere.

UUID format

xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

The 4 marks version 4, and y is one of 8, 9, a or b (the variant). The rest is random.

Tips

  • Generate a few extra. Nothing is saved, so copy what you need before you leave.
  • A UUID is an ID, not a secret. Use the password generator for passwords.

Fingerprint text or files with the hash generator, or format JSON test data with the JSON formatter.

Frequently asked questions

What is a UUID?

A 128-bit identifier written as 36 characters, like 3f2c8a9e-6b1d-4c7a-9e2f-1a2b3c4d5e6f. Version 4 UUIDs are random, so they don’t reveal an order or a time.

Is a GUID the same as a UUID?

Yes. GUID is Microsoft’s name for the same format.

Can two UUIDs ever be the same?

In theory, yes. In practice the chance is so small that v4 UUIDs are safe as database keys.

Where does the randomness come from?

Your browser’s cryptographic random generator (crypto.randomUUID, or getRandomValues as a fallback).

Can I use a UUID as a password?

No. Use the password generator for secrets.

Related tools

Hash generatorMD5, SHA-1, SHA-256 and SHA-512 hashes for text or a file.Password generatorGenerate strong random passwords and passphrases.JSON formatterFormat, validate, minify and explore JSON.Base64 encoder and decoderEncode text or a file to Base64, or decode Base64 back to text.Barcode generatorMake a Code 128, Code 39, EAN-13, UPC-A or ITF-14 barcode as a PNG.

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