Emacs: Set Font in Init File

Change Font/Size Globally by Menu

Chose the menu:

1. menu [Options ▸ Set Default Font…]
2. menu [Options ▸ Save Options].

This changes the default font for all your current session's emacs windows/buffers, and also save it to the Emacs Init File in the custom-set-variables section. [see Emacs: M-x customize Tutorial]

Set Default Font and Size in Init File

put this in your Emacs Init File:

(when (member "Consolas" (font-family-list))
  (set-frame-font "Consolas" t t))

You can add a font size:

(when (member "Consolas" (font-family-list))
  (set-frame-font "Consolas-14" t t))

or

;; set default font
(cond
 ((string-equal system-type "windows-nt") ; Microsoft Windows
  (when (member "Consolas" (font-family-list))
    (set-frame-font "Consolas" t t)))
 ((string-equal system-type "darwin") ; macOS
  (when (member "Menlo" (font-family-list))
    (set-frame-font "Menlo" t t)))
 ((string-equal system-type "gnu/linux") ; linux
  (when (member "DejaVu Sans Mono" (font-family-list))
    (set-frame-font "DejaVu Sans Mono" t t))))

See also: Emacs Lisp: Determine OS, Emacs Version, Machine Host Name

List available fonts

(print (font-family-list))

[see Evaluate Emacs Lisp Code]

Check if a font exist

;; returns true if Symbola exists
(member "Symbola" (font-family-list))

[see Emacs: Evaluate Elisp Code]

Set Font for Unicode Symbols

Symbols here mean misc unicode characters that are Math Symbols ∑ ∫ π² ∞, Arrows →, Keyboard Symbols ⌘ ↩ ⌫, Cultural Symbols ☭ or dingbats. But excluding emoji.

;; set font for symbols
(set-fontset-font
 t
 'symbol
 (cond
  ((string-equal system-type "windows-nt")
   (cond
    ((member "Segoe UI Symbol" (font-family-list)) "Segoe UI Symbol")))
  ((string-equal system-type "darwin")
   (cond
    ((member "Apple Symbols" (font-family-list)) "Apple Symbols")))
  ((string-equal system-type "gnu/linux")
   (cond
    ((member "Symbola" (font-family-list)) "Symbola")))))

Set Font for emoji

• Emacs: Emoji Font Setup

Set Font for Chinese

• Emacs: Chinese Font Setup

How to install font

• Microsoft Windows: double click on the font.
• MacOS: double click on the font.
• Linux: How to Install Font, List Fonts

Restart emacs. Emacs should see it.