How to attach files to cards on Trello

beginner 8 min read Updated 2026-03-18

Quick Answer

Attach files to Trello cards by opening the card, clicking the Attachment button in the sidebar, then choosing to upload from your computer, Google Drive, Dropbox, or other connected services. Files can be up to 10MB on free accounts and 250MB on paid accounts.

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Prerequisites

A Trello account
Access to a Trello board
Files ready to upload on your device
Basic familiarity with Trello cards

Step-by-Step Instructions

Open the Trello card

Navigate to your Trello board and click on the card where you want to attach a file. The card will open in a detailed view with options on the right sidebar.

You can also hover over a card and press <code>Enter</code> to quickly open it.

Click the Attachment button

In the card's right sidebar under the Add to card section, click the Attachment button. This will open the attachment options menu.

Choose your file source

Select how you want to attach your file:

Computer - Upload from your local device
Google Drive - Attach from Google Drive
Dropbox - Attach from Dropbox
OneDrive - Attach from Microsoft OneDrive
Link - Attach a file via URL

Connect your cloud storage accounts in Trello settings for easier access to files.

Select and upload your file

If uploading from Computer, click Choose a file and browse to select your file. For cloud services, navigate through your folders and select the file you want to attach. Click Attach to confirm.

You can drag and drop files directly onto the card for faster uploading.

Add a file description (optional)

After selecting your file, you can add a description in the text field that appears. This helps team members understand what the file contains. Click Upload or Attach to finalize.

Use descriptive names to make files easier to find later.

Verify the attachment

Once uploaded, the file will appear in the Attachments section of the card. You'll see the file name, size, and upload date. A small paperclip icon will also appear on the card thumbnail in board view.

Click on the attachment to preview or download it.

Manage your attachments

To remove an attachment, hover over it in the card and click the Delete (trash can) icon. You can also click Edit to change the file description or make it a card cover image.

Use the <strong>Make Cover</strong> option for image files to create visual card covers.

Common Issues & Troubleshooting

File size too large error

Free Trello accounts have a 10MB file limit, while paid accounts allow up to 250MB. Compress your file or upgrade your account to attach larger files.

Cannot connect to cloud storage

Go to your Trello account settings and authorize the connection to Google Drive, Dropbox, or OneDrive. Make sure you're logged into the correct cloud storage account.

Attachment button is missing

Ensure you have edit permissions on the board. Board admins may have restricted attachment permissions. Contact your board administrator if the issue persists.

File won't preview in Trello

Trello supports previews for common file types like images, PDFs, and documents. Unsupported file types will show as download links instead of previews.

Prices mentioned in this guide are pulled from current plan data and may change. Always verify on the official Trello website before purchasing.

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