UUID / ULID / NanoID Generator

Unique IDs are the everyday glue of software — database keys, request IDs, file names, tracking references. This generator produces three modern kinds: UUID v4, the universal 36-character standard; ULID, which sorts chronologically because its first characters encode the time; and NanoID, a compact 21-character ID safe to put in URLs. Choose a type and how many you need, and copy the batch in one click. IDs are generated with your browser's cryptographic randomness and never leave your device.

How to use it

1. Choose the ID type — UUID v4, ULID, or NanoID.
2. Set how many you need, up to 100 at once.
3. Copy the list — one ID per line, ready to paste into code or a spreadsheet.

Examples

• UUID v4: 9972daab-2c86-459f-9d78-3fe1be4e3280
• ULID: 01HF7YAT00K5SDNASCGS2SZQBR — the first 10 characters encode the time
• NanoID: AgCF_odYEvtIc8guZVuvp — 21 characters, URL-safe

Frequently asked questions

Are these IDs really unique?

Statistically, yes. A UUID v4 has 122 random bits — you could generate a billion per second for decades before a collision becomes likely. ULID and NanoID carry similar randomness. They are unique by probability, not by registration, which is exactly how they are used in production systems worldwide.

When should I use ULID instead of UUID?

When sort order matters. A ULID's first 10 characters encode its creation time, so sorting ULIDs alphabetically sorts them chronologically — ideal for database keys where insert order should cluster together. UUIDs sort randomly, which can fragment database indexes.

What is NanoID good for?

Short, URL-friendly references — share links, public tokens, file names. At 21 characters it is smaller than a UUID with comparable randomness, and its alphabet avoids characters that need escaping in URLs.

Are the IDs generated on a server?

No. They come from your browser's built-in cryptographic random generator, on your device. Nothing is transmitted or logged, and no one — including us — has a record of the IDs you generate.