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I love the ability to preview LateX fragments in Org-mode. With two easy shortcuts one can turn them on and off on-demand:

  • Turning previewing ON: C-c C-x, C-l
  • Turning previewing OFF: C-c C-c

One problem I encounter often is that the preview has a small font size. Is there any way to control it?

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2 Answers 2

Reset to default
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You can customize the variable org-format-latex-options to increase :scale.

See the Org Manual, 11.7.4 Previewing LaTeX fragments.

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  • Do you know whether there is a way to change the background color of the latex fragments? It's slightly different from my Emacs background color, which bugs me out a bit...
    – pfincent
    Commented Feb 26, 2021 at 20:16
  • @pfincent with C-h v org-format-latex-options you can see a few options in Value some of which mention background. I have not tried to change the background but maybe some of those options could help.
    – userrandrand
    Commented Mar 2 at 5:06
  • @pfincent for example this answer looks like it could help ( I just saw the code I did not test it) emacs.stackexchange.com/a/74196/43678
    – userrandrand
    Commented Mar 2 at 5:25
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Expanding Constantine's answer.

You can use C-h v org-format-latex-options RET to understand what can be changed in this variable. One of the options is the scale. In the help page in Emacs you can click to change the value of the scale to 2.0, for example, so that the equations look bigger when you run C-c C-x C-l.

Alternatively, you can add the following to your init.el file:

(setq org-format-latex-options (plist-put org-format-latex-options :scale 2.0))

Which also increases the scale.

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  • 1
    Don't know if others are having this issue, but it doesn't work using this elisp snippet. I have this in my setup, which works for me: (after! org (plist-put org-format-latex-options :scale 1.75)
    – Edward Grefenstette
    Commented May 10, 2021 at 16:14
  • @EdwardGrefenstette minor addition: you're going to need an extra closing parenthesis at the end of your code snippet, otherwise Emacs reports an end-of-line error
    – pfincent
    Commented Jan 15, 2022 at 13:51

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