How do I scale all font faces in emacs?

How do I scale all font faces in emacs?

[Matt Young]

Hello - I find myself needing to enlarge text in emacs in order to be
able to read it. I've been able to enlarge only some text by using
``set-frame-font'' in my emacs configuration, but I notice that other
faces are not affected by this. For instance, the mode line, and what I
think is eldoc in the minibuffer is not any larger. Some modes define
their own face settings as well that seem to ignore the more global
settings. 

I am not an emacs configuration expert and I am not sure that I am even
using the correct terminology or what options are even available in
this area.

Using ``customize-font-face'' is not a solution because there are over
600 entries there and I don't know what any of them control, and I do
not feel I should have to configure a multitude of faces individually.

Is there any way to scale all text globally with a single setting so
that it affects every face at once?

If there is not, I feel this could be worth a bug report. It is
important that something like this is as easy as possible for users
with vision problems.

Thank you

Re: How do I scale all font faces in emacs?

[Eric S Fraga]

Most faces inherit from the "default" face, if the theme has been setup
properly. If so, customise that face to the size you want.

I have the following in my init file:

(set-face-attribute 'default nil :font "Iosevka Fixed" :height 200)

which is a large font size for my high resolution monitor.

-- 
Eric S Fraga via gnus (Emacs 30.0.50 2023-02-14) on Debian 11.5

Re: How do I scale all font faces in emacs?

[Björn Bidar]

Which platform are you running on, which ui?

The scaling of the ui and thus also fonts depends on the platform.

For HighDPI displays most platforms scale up the ui.