How to increase font size of the page content in browsers?

Hi all,

Recently I have switched to Debian 13.4 KDE Plasma DE. One issue I have asked AI about and couldn’t find any solution to is that the font size of the content area of all browsers (Chrome, Chromium, Firefox, and Brave) is very small to my eyes (and taste).

By content area I mean anything but the UI of the browsers (so, except browsers menus, etc.). Example: Gmail, Google Search page, this forum….

  • I have more than enough decent fonts installed in my system and registered/updated via “fc-cache -fv” command. In fact, I have no font-related issue across KDE-native UI&apps and other ones like LibreOffice Writer.

  • Due to the enormous number of unnecessary fonts installed, among those that Noto family, I have uninstalled many of the fonts installed by the said Debian KDE edition by default. But as I said, I have installed more than enough fonts, including the Latin flavor of Noto font family.

    Thanks in advance!

Does [Ctrl] [+] not work for you?

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In Firefox’s settings you can set a default zoom level. Also, if your problem is specifically that the fonts are too small (but graphical elements are OK) then you can select “Zoom text only”.

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It’s possible to enter a filter to disable most of the ‘spam’ there, I used this:

NoExtract = usr/share/fonts/noto/* !*NotoSans-* !*NotoSerif-* !*NotoMono-*

Otherwise, sure - just holding Ctrl and scrolling the mousewheel zooms in and out nicely, then Firefox settings gives you lots of options besides that… including ‘default’.

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Usually it’s just browser scaling. I think you should try increasing the default zoom in Firefox or Chromium based browsers. Maybe also adjust KDE display scaling. Since it’s not really a font issue.

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Firefox

  • Press Ctrl + + to zoom in

  • Or set default zoom:
    Settings → General → Zoom → Default Zoom

  • Or force DPI:
    about:configlayout.css.devPixelsPerPx1.25 (example)

Chromium / Chrome / Vivaldi / Brave

  • Settings → Appearance → Page Zoom

  • Or press Ctrl + +

System‑wide scaling (Plasma)

  • System Settings → Display → Scale

  • Log out and back in

Force browser to follow system font size

Some browsers ignore KDE’s font settings unless manually set.

FYI @aitranslator created an account 4 days ago, made a single post, and hasn’t been seen for 4 days.

The solution (adjust page zoom) was the very first response.

Thank you for your replies! The small font issue is only in and with web browsers (Chrome, Chromium, Brave, Firefox), and with each and all of these! Please see the attached screenshot. For a given font size, no matter what size, notice the font size difference between the UI/Menu of the browser (highlighted with orange-ish color) and content (highlighted with green-ish color). That difference is the issue.

Other than this, I have no problem with other desktop enviromenment native apps like filemanager, other KDE-native or third-party apps. They all show/render the fonts size the way they are supposed to.

I need a permanent fix/solution, rather than changing default zoom each time I launch a web browser.

Thank you!

The default you choose should stick, it shouldn’t need to be changed each time you launch the browser.

Are the browsers not retaining the defaults you set?

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Besides, Zooming-in make the UI/menu font size/appearence ridicioulusly big! It is obvious that the zoom-solution is not a genuine one. At least not the one I’m looking for. Thanks.

When I change the default zoom on Firefox, it affects the size of the page content only, and doesn’t change the menus and UI at all.

I think you are referring to the web page here - as it doesn’t affect the browser at all.

So here’s Facebook at 110%, and then we’ll do it at 150%



It’s the whole page UI expanded, not the Firefox/browser UI.

Zoom Only Text

However, you can also select in the menu to ZOOM TEXT ONLY:

Menu (View :play_button: Zoom :play_button: Text
Touch AltVZT

Now try again with the Ctrl_Mousewheel zooming :wink:

:memo: - the sidebar inside the Firefox webapp is still going to be zoomed, because it is part of the text… and Reader won’t work with this crappy software either.

You can always set your desired fonts and their sizes in each browser, no need for zooming if you don’t like using the zoom feature

Overall, fonts should be set by the web page… setting your own font sizes in settings tends to mess that up if it overrides web pages.