When designs require a custom font not installed on a default Windows, macOS, iOS, or Android device, you should remember to embed the custom fonts you used in your template to achieve the best possible results for users on devices that do not have that font installed on the device.File size: Please be aware that embedding fonts can dramatically increase the file size of your Office documents. Use the 'Embed only thr characters use in the document (best for reducing file size)' option to reduce the impact on the file size.Learn more about how to embed fonts in documents here: Embed fonts in documents or presentations (microsoft.com)