Online UUID Generator
Generate unique identifiers in version 4 format with crypto-safe randomness. Set how many you need, pick your formatting, then copy items one by one, copy them all, or download the batch as a text file.
Generated UUIDs
Validate a UUID
Paste any value below to check whether it is a valid version 1 or version 4 UUID.
How to use
- Choose how many UUIDs you need, from 1 to 100.
- Pick the letter case, hyphen style and optional wrapper.
- Press Generate UUIDs, then copy any single item or use Copy all.
- Use Download as .txt to save the whole batch to your device.
- Use the validator box to check any UUID you already have.
About UUID v4
- A UUID is a 128-bit label written as 32 hexadecimal characters, usually in groups of 8-4-4-4-12.
- Version 4 means the value is random: the version digit is 4 and the variant bits are set correctly.
- This tool uses crypto.getRandomValues, the crypto-safe random source built into your browser.
- Collision risk is extremely low, which makes v4 UUIDs ideal for database keys, request IDs and tokens.
Frequently Asked Questions (FAQ)
What does the online UUID generator do?
It creates batches of unique identifiers in version 4 format using the crypto-safe random number generator of your browser. You can set the count, letter case, hyphen style and braces, then copy or download the results.
How many UUIDs can I generate at once?
You can generate between 1 and 100 UUIDs in one batch. For larger sets, run the generator again and combine the outputs.
What formatting options are available?
You can choose lowercase or uppercase letters, include or remove hyphens, and wrap each UUID in curly braces or parentheses, or leave it plain.
How does the UUID validator work?
Paste any string into the validator box and press Validate UUID. It checks the 8-4-4-4-12 hexadecimal structure and reports whether the value is a version 1 or version 4 UUID.
Is the UUID generator free?
Yes, the tool is completely free to use with no signup, and everything runs in your browser so nothing is sent to a server.