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ULID generator

Generate ULIDs online: 26-character IDs that sort by creation time, written in Crockford Base32 so they are short, URL-safe and easy to read. Make up to 1,000 at once and copy them. Made in your browser, nothing uploaded.

How to generate a ULID

  1. 1Open "Generate IDs" with "ULID" selected
  2. 2Set how many you want, up to 1,000
  3. 3Copy the list, or click "Generate new"
  4. ULIDs in creation order, one per line.

What you get

  • Sorted by time.The first 10 characters hold the time in milliseconds, so ULIDs sort in the order they were made.
  • Same millisecond, still in order.ULIDs made in the same millisecond count up instead of being random.
  • Nothing is uploaded.They are made on your device with the browser's secure random generator.

What you can do

  • Make 1 to 1,000 ULIDs at once. The default is 5.
  • Get 26 characters from 0 to 9 and A to Z, without I, L, O and U, so they are hard to misread.
  • Switch the ID type to UUID v7 or UUID v4 if your system needs a UUID.
  • Paste a ULID into "Decode an ID" to read the time it was made.

Good to know

  • A ULID is 10 characters of time plus 16 of randomness. The time is visible, so use a random ID if that must stay private.
  • A ULID has no hyphens and is already uppercase, so "No hyphens" and "Uppercase" change nothing for it.
  • A ULID is not a UUID, but it holds the same 128 bits and can be stored as one.

Questions

What is a ULID?

A Universally Unique Lexicographically Sortable Identifier: 48 bits of time and 80 random bits, written as 26 characters.

How is a ULID different from a UUID?

It is shorter when written out (26 against 36 characters) and always sorts by time. A UUID v7 does the same in the UUID format.

Can I read the time in a ULID?

Yes. Paste it into "Decode an ID" to see the date and time in UTC.

Is anything uploaded?

No. The ULIDs are made in your browser.

Related tools

How it works

Small tools that run in your browser.

Four steps

  1. Start with a file or a task

    Drop a file, search, or pick a task.

  2. The tool opens in a window

    Open as many as you like, side by side as tabs.

  3. Results collect on the right

    Drag a result into the next tool.

  4. Save when you're done

    Saved files go to your downloads.

Who uses what

Tool sets for common jobs.

Put a tool on your home screen

The icon opens that tool, like an app.

iPhone and iPad

  1. Open the tool in Safari.
  2. Tap Share (the square with the arrow).
  3. Choose “Add to Home Screen”, then Add.

Android

  1. Open the tool in Chrome.
  2. Tap the menu (⋮) at the top right.
  3. Choose “Add to Home screen” or “Install app”.

Computer

  1. Open the tool in Chrome or Edge.
  2. Click the install icon in the address bar.
  3. Choose Install.

Skills

Claude skills we use ourselves, one job each.