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JPG image thumbnails are just blobs of color, image not rendering

Karen Newcombe
June 5, 2026

For weeks we've run into an issue where uploaded images (usually jpgs for us) are not rendering the thumbnail, it is just showing a flat color picked from the background of the image, e.g. if there's a brown background the entire thumbnail is brown.  

I can see this has also been a problem in the past.  Any word on when it will be resolved? 

Thank you, Karen 

1 answer

0 votes
Arkadiusz Wroblewski
Community Champion
June 5, 2026

Hello @Karen Newcombe 

If the downloaded JPG works, your file isn't corrupted, this is likely a backend glitch with Trello's thumbnail preview generation.

Try converting the image to a standard sRGB JPG or PNG to rule out color profile problems. If the preview still displays as a flat color block, reach out to Trello Support with the card URL and original file so they can investigate.

There was a recent issue where attachments also got affected but I don't want to jump ahead and assume premature anything yet.

Best,

Arkadiusz 🤠☀️

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