Add attachments to cards

Card attachments are files uploaded to cards. Attachments appear in the "Attachments" section of the card detail. You can add attachments from:

Your Computer
Trello
Confluence
Jira
Any link via the Search or paste a link field (e.g., social media, Google Drive, Dropbox, Box, OneDrive, etc.)

Note:

Attachments from your computer create an actual copy within Trello.

Attachments from Confluence, Jira, other sources simply store links to those web pages.

Documents that are attached as links from any cloud storage (such as Google Drive, OneDrive, etc.) can be edited and saved in their respective applications and do not need to be downloaded, saved, and reattached to your card.

Trello card attachments create a link between both cards.

Adding Attachments

Click the front of the card to open it. Click the "Attachment" button on the right side of the card to upload.

Attach files to your cards to keep your project in one place.

On newer versions of Chrome and Safari, you can simply drag and drop the file from your desktop on to the card. This doesn't require opening the card first.

Card Covers

For image files which you upload to a Trello card, Trello will automatically create a picture to put on the front of the card and in the header of the card back. These are called "card covers." Card covers aren't available for image files that are linked via a link.

As with other kinds of attachments, in Chrome and Safari, you can drag and drop the file from your desktop onto the card in order to add it.

In Firefox, and Chrome, images can be also be pasted directly onto cards from your clipboard. On a Mac, use the CMD + V. On a PC, use CTRL + V. You can even do this from either the front or the back of the card!

You can click a card to open it to choose which image to use as a card cover (or remove the card cover if you wish to no longer display that image on the front of your card by clicking the Remove Cover link next to the attachment).

Use card covers to add some life to your board! Card covers can come from multiple sources; you can use a solid color, upload your own image to use, or search for images via Unsplash to really liven things up.

You can also select between two different sizes, for two completely different looks on your boards. Whatever fits your project best!

The smaller style looks like other cards and still shows indicators for card content like descriptions, due dates, and attachments. Prefer your card to look a little more like a header? The larger style hides those indicators and makes the title font a little bigger and bolder.

Card covers can be disabled on a board by a board admin. To turn them off, open the board's Additional Settings in the boards Menu and uncheck "Card Cover Images Enabled".

Bonus Tip:

Animated gifs that are less than 300 pixels wide and less than 5MB will display as animations on card covers. Check out the Giphy Power-Up to find the perfect card cover!

Preview And Download Attachments

You now have a more compact and informative design that allows you to preview most document types directly within the app, eliminating the need to switch between applications. This new feature provides a more streamlined experience compared to the older thumbnail preview option.

However, Trello card attachments often benefit from displaying more granular information directly on the card itself. To accommodate this need, the thumbnail preview attachment feature remains available for Trello cards,

You can also edit, download and delete a uploaded attachment on a card via the more option.

Limitations

There is a 10 MB file upload limit per attachment. However, paid members have a 250 MB file upload limit per attachment. There is no account data storage limit in any Trello plan.

The 10MB file upload only applies to files uploaded from your computer. It does not apply to files attached via a link.

Attachment Security

If you attach a file from your computer (using the "Attach a file from your computer" option in the "Attachment" menu), the attachment is stored in Amazon S3.

Effective December 1, 2023, all uploaded attachments will check for user authorization in order to display the file due to security considerations. This means you won't be able to share an attachment link with another person who doesn't also have access to the board in Trello where that attachment was uploaded. If you try to load a Trello attachment when not logged in, you'll be prompted to first log in before being able to view the attachment.

Attachments and previews on public boards will remain fully accessible without an account. Deleting the attachment in Trello permanently removes the file from Amazon S3. Deleting a card will also delete any files attached to that card.

If you need additional security, we recommend using links to files stored under your cloud storage accounts (e.g., Google Drive).

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