Windows: manage installed fonts, then choose a font in the app
Microsoft’s Windows font management instructions place the available font list in Settings → Personalization → Fonts. Use the list to find and preview a family. For a downloaded TTF or OTF file, extract a ZIP archive first if needed, then use the font file’s Install command. Installation makes a resource available; it does not by itself restyle an existing document.
Return to the document application, select the text and choose the intended family in that app’s font controls. Microsoft notes that custom fonts are not supported by every app. Keep the exact family name with your document so you can distinguish an installed resource from a similarly named choice in a web editor.
Mac: select text and use the application’s Fonts window
Apple’s Mac text-formatting guide describes Command-T in supporting apps, or the appropriate Format → Show Fonts route. Select the text, choose a collection and typeface, and choose the required style. Font Book manages installed resources; the application controls the text you are editing.
Prepare one heading and one paragraph before restyling a long file. Compare the complete wording and line breaks. The Inter and Lora profiles here are independent comparison options, not replacements automatically applied to your operating system.
For bigger screen text, use the size controls instead
For Windows 11, Microsoft’s text-size instructions use Settings → Accessibility → Text size. Display scaling is a separate control that enlarges other screen elements too. A document font change and a screen-size change solve different problems.
For a caption field that does not offer a font menu, the free copy-and-paste text generator provides Unicode character styles. Those characters do not install a family or alter the computer’s interface. If the desired change is colour, use the separate font colour guide rather than looking for a new font file.
Your questions, answered.
Does installing a font change every app automatically?
No. Select the family in the application that edits your text; some apps use their own resources or do not support custom fonts.
Should I change the font if everything on screen is too small?
Start with the relevant text-size or display-size setting. That changes viewing size rather than selecting another typeface for a document.
Sources & background
Sources supporting this page’s explanations. Practical examples are our editorial suggestions.