Getting Started
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
Google Drive
Dropbox
Box
OneDrive
Any Link
Note:
Attachments from your computer create an actual copy within Trello. Attachments from Google Drive, Dropbox, Box and OneDrive simply link back to the document in its respective location.
Documents that are attached with Google Drive and OneDrive 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 "Attach File" 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 Google Drive, Dropbox, Box or OneDrive.
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 IE, 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 can preview image and video attachments within Trello without having to download them by clicking on the thumbnail of the attachment from the card back to open the preview. Other file types, like .pdf or .doc cannot be previewed.
You can also open the file in a new tab by clicking on the icon of the box with an arrow on it. To download the file, you can right-click on that icon and then choose to save the link.
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 from Google Drive, Dropbox, Box or OneDrive.
Attachment Security
If you attach a file from your computer (using the "Computer" option in the "Attach File" menu), the attachment is stored in Amazon S3. For boards created prior to July 2021, the URLs for the attachments are cryptographically unguessable, meaning that no one is going to be able to guess your attachment URL. However, if you share the URL for a Trello attachment, anyone with the URL will be able to see the attachment.
Beginning in July 2021, attachments uploaded to newly created Trello boards will check for user authorization in order to display the file. This means you won't be able to share an attachment link to 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 Google Drive for attachments. You can attach files from Google Drive directly to Trello and specify fine-grained access to the file via the Google Drive interface.
See Also
Frequently Asked Questions
Does Trello support WEBP, HEIC, or TIFF formats
Not at this time!
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