How to Add a New Font to Obsidian

Following the guide in this Reddit post, as below:

Convert the font file to CSS through this website https://hellogreg.github.io/woff2base/ or https://www.fontconverter.io/en/css-embedded-font-base64.
Make sure the CSS font property contains font-family: "{fontName}"
Place the generated CSS file in Obsidian snippets folder .obsidian/snippets
In Obsidian Settings/Appearance
1. Enable the CSS file, under CSS snippets,
2. in Text Font, enter the font name placed in the CSS under font-family

@font-face {
	font-family: '{font-name}';
	src: url(......)
}

While if you want to set a specific font to a specific language, you could use unicode-range CSS property, so the font is applied to specific set of characters. For example, for Arabic language that includes every possible Arabic character:

@font-face {
	font-family: '{font-name}';
	unicode-range: U+0600-06FF, U+0750-077F, U+08A0-08FF, U+FB1E-FB4F, U+FB50-FDFF, U+FE70-FEFF;
	src: url(......)
}

Explanation of the Unicode Ranges

Arabic (0600–06FF):

This range includes the basic Arabic letters, diacritics, and some punctuation marks.
- Example characters: ا (U+0627), ب (U+0628), ت (U+062A), etc.

Arabic Supplement (0750–077F):
- This range includes additional Arabic letters used in various languages.
- Example characters: ٱ (U+0671), ٲ (U+0672), etc.
Arabic Extended-A (08A0–08FF):
- This range includes more letters used in specific Arabic dialects and languages.
Arabic Presentation Forms-A (FB1E–FB4F):
- This range contains ligatures and contextual forms of Arabic letters.
- Example ligatures: ﻻ (U+0644 U+0627), ﻷ (U+0644 U+0623), etc.
Arabic Presentation Forms-B (FB50–FDFF):
- This range includes additional ligatures and contextual forms.
Special Characters (FE70–FEFF):
- This range includes additional presentation forms and special characters related to Arabic script.

And you could change the Font size for this specific font by adding size-adjust CSS property

@font-face {
	font-family: '{font-name}';
	unicode-range: U+0600-06FF, U+0750-077F, U+08A0-08FF, U+FB1E-FB4F, U+FB50-FDFF, U+FE70-FEFF;
	size-adjust: 120%;
	src: url(......)
}