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Trello is suddenly underscoring all spaces between word in only PDF's

Jeff Arwine
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January 15, 2026

Why is Trello suddenly underscoring all spaces between word in only PDF's?

I have done some troubleshooting and it is happening only with pdfs and started suddenly yesterday, images it does not underscore.

This is extremely annoying as I have to go into every download and delete the spaces or copy and paste the original file name, time consuming and unnecessary. Yes there are third party apps that would mitigate this issue, but why did it happen all of a sudden? If it was a Trello change, then I would assume ALL downloaded files would do this.

I just read a thread from this site in 2018 that stated Atlassian was working on removing those underscores. Since I started using Trello last June, this has never occurred until yesterday. 

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Mirek
Community Champion
January 16, 2026

Hi @Jeff Arwine 

I remember some individual cases but I cannot find any official bug or something that would confirm that.. 

And you probably refer to this thread from 2018, correct?.. 

https://community.atlassian.com/forums/Trello-questions/Can-one-stop-Trello-from-replacing-spaces-with-underscores-in/qaq-p/825761

Most web services (Trello included) internally convert spaces because URLs historically can’t safely carry raw space characters - browsers and servers encode them as %20 or remove them. Using underscores avoids unexpected encoding/decoding issues.

I think even if you think that nothing changed, something might actually like browser version that you use (it could update at the backend). And I would say that this the thing that work between us and the system.. 

Maybe you can check how it behave on a different browser or system? 

Not sure what else we can try.. 

Jeff Arwine
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January 16, 2026

I am calling our IT this morning, I am not convinced it is a Trello issue since it doesn't behave this way on my associates computer. And yes, that is the thread I located. I'll post any resolution I find.

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Mirek
Community Champion
January 18, 2026

Ok, if this is working on a different computer then yes.. it it good to focus on what is going on on your environment (especially what changed). Yes, would be nice if you can share what you would be able to find out with IT. 

Thank you!

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Jeff Arwine
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January 19, 2026

No, it appears that any computer using Trello has this issue, our IT had no solution either.

Mirek
Community Champion
January 19, 2026

Ok, so now it also does not work on associate computer? 

Mirek
Community Champion
January 19, 2026

Let me request for assistance here. Hopefully someone would look at the backed and give us a valuable input. 

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