Can I show task ID on closed cards?

Yes! To do that, go to board Settings → Card Template and turn on the External ID field.

Task IDs visible on card fronts

Additional options

You can customize how the ID appears by choosing to:

  • Show or hide the ID on the front of cards.
  • Allow the ID to be editable or fixed.
  • Automatically generate an ID for each new task.
  • Use sequential numbering—starting from “1”—or a randomly generated multi-digit number—matching the task’s internal ID, which you can see in the task’s web address
    (the last 8 digits of an open-task URL)
    .

Another way to display IDs

For even more flexibility, try the Task Summary power-up. It lets you display the task ID
—or any other card details—on closed cards, giving you full control over what information is visible.