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Fixing tiny fonts in JOSM on Windows

Posted by watmildon on 14 March 2023 in English.

Act now to save from eye strain!

Did your JOSM UI text become a huge bother to read? Is it too tiny? Are the icons not as you’d expect? You may be suffering from a case of Too High DPI! It’s more common than you think!

Thankfully the medicine is easy enough to apply at home. You’ll need to find and edit the properties of the JOSM.exe file. It’ll be at a path like C:\Users\admin\AppData\Local\JOSM (you’ll need to change “admin” to whatever your user account is). Right click the exe > properties > Change high DPI settings > check “Use this setting to fix scaling problems…”

A screenshot of dialog boxes showing the workflow enable high DPI correction on Windows


Comment from BCNorwich on 23 March 2023 at 08:43

Hi, Thanks, this advice helped me.

Comment from watmildon on 23 March 2023 at 18:52

Wonderful. I knew I would need this the next time I flatten this machine so it helping others is a huge and perfect side benefit.

Comment from CoyKoi on 29 March 2023 at 21:22

I run JOSM using OpenWebStart in Windows, so I don’t have this JOSM.exe available. I had similar issues with UI font sizes. What helped in my case was to change the Look and Feel theme in the Display preferences:

I changed to Nimbus, and it was a complete fix of my UI scaling issues.

Comment from watmildon on 30 March 2023 at 04:01

Excellent addition! I have run from OpenWebStart from time to time so this definitely would have surprised me. Thanks for pointing it out.

Comment from Paul Berry on 10 January 2024 at 20:21

I’ve just found this page on a search for “JOSM Windows tiny fonts” and switched to the Nimbus look & feel. Thank you for the advice!

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