To permanently increase the font size in Doom Emacs, you need to edit your Doom Emacs configuration file: ~/.doom.d/config.el. Here’s how:

✅ Step-by-step: Set permanent font size in Doom Emacs

  1. Open your Doom config:

    SPC f p             ;; (or M-x doom/open-private-config)

    or manually open:

    ~/.doom.d/config.el

  2. Set the font face (including size):

    Add or edit the doom-font variable:

    ;; Example: Fira Code, size 18
(setq doom-font (font-spec :family "Fira Code" :size 18))

    If you use other fonts (e.g., JetBrains Mono, Source Code Pro), just change the :family.

  3. Optional – configure variable-pitch and big font (used for presentations):

    (setq doom-variable-pitch-font (font-spec :family "sans" :size 18)
      doom-big-font (font-spec :family "Fira Code" :size 24)) ;; for SPC z b

  4. Apply changes:

    Run the following in your terminal:

    doom sync

  5. Restart Emacs (or run M-x doom/reload or SPC h r r) to apply the new font.

🧪 Tips for Troubleshooting

  • To see available fonts: Run this in Emacs:

    (print (font-family-list))

  • Ensure the font is installed on your system (e.g., Fira Code, JetBrains Mono).

  • You can use M-x describe-font to inspect currently active font.

  • Install the fira-code font on Rocky Linux:
sudo dnf install -y fira-code-fonts

Updated: