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Is it possible to allow for cards to be linked?

For example, when a feature becomes a saga and therefore the card generates its own "board" (perhaps in a different organisation—if the feature is being "outsourced") such that the smaller components of the feature appear on that.

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Note: This answer has been updated due to changes in Trello. Legacy information still available at the end.

The answer

You can link to other cards in any board. Just paste the link to the card into the text...

editing description

and Trello will convert it to a nice-looking link with an icon and the card title.

linked card

When you open a card the address bar changes to a direct-link to that card, so you can copy it from there. This does mean that you have to navigate to the other card in order to get the link. The old way allowed you to start typing '#' and then choose from a list or type the number. However, it does mean that you can link to cards on other boards.

The old way

Yes, you can! All you have to do is type #xx where xx is the card number - as far as I know you can do this anywhere that you input text - I have tested it in descriptions and comments.

For example you might have something like this in a card description:

See also:
---------

- Card #23 (Tidy shed)
- Card #4 (Clear out garage)
- Card #45 (Do that other thing)

The #xx will appear as a link to the referenced card.

Note that the card reference is working only in the same board, it is not cross-board

Response from Trello (2016-01-27)

When the old behaviour changed I filed a bug report with Trello and got this back:

What you discovered is actually an expected behavior at this point. We recently deprecated the number linking functionality within Trello, and at this point, unfortunately, there is no such feature available. Right now, your best bet is to use the full link to the card.

We definitely understand that that's frustrating. I'm sorry that we've removed a part of Trello that was important to your use of the product. Unfortunately there were some issues with the links and they wouldn't work properly once cards have been moved to other boards. Similarly, our mobile application would only show the number and wouldn't actually build a clickable link.

The best I can say is that we're working to change how we add things to Trello so we don't have to remove features in the future.

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But what if my board is not English? It will appear as Card #20. Ok, You should not start a paragraph with #, because it will be interpreted as a header. – pihentagy Jan 30 '14 at 15:49
    
@pihentagy Spanish: Tarjeta #23 Greek: κάρτα #23 Swedish: kort #23 - you get the idea. It doesn't matter what your text says, the #23 gets automatically converted to a link. – jhabbott Jan 30 '14 at 20:07
    
Ok, figured out ITMT, and commented the following (maybe forgot to submit), that the only gotcha is that if the first character in the paragraph is hashmark, then it will be interpreted as header. And you cannot customize the link title. – pihentagy Jan 31 '14 at 8:26
    
We did this a lot, and it has stopped working :-( – reinierpost Jan 27 at 12:50
    
Oh yeah - I just reported this as a bug here: help.trello.com/article/709-reporting-trello-bugs – jhabbott Jan 27 at 17:30

Yes it is possible to link individual cards and even move a card between boards.

To find a card's link:

  1. Open the card (press Enter).
  2. Click the More... link at the bottom of the right side panel.
  3. You should see a text box containing the link.

To move a card:

  1. Open the card (press Enter).
  2. Click the Move... button in the right side panel.
  3. Choose your board and Click Move.
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I recommend the Trello Shortcuts Plus Chrome Extension to copy the global card link with a shortcut key.

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I think Zapier.com will do this. Just do a trello to trello Zap.

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No, there is no Zap to create links, as far as I can see. – reinierpost Jan 27 at 12:52

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