For Windows power users, it is theoretically possible to create a system-level font substitution rule using the Windows Registry. This is for casual users, as editing the registry can be dangerous. The key is located at HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\FontSubstitutes . A skilled user could add a value to automatically map a missing font name to an installed one, but this is a complex and fragile workaround.
Less commonly, a similar prompt may appear on macOS when a webview or application needs to download a font to display a webpage correctly. The message might read, "‘CharacterPalette.app’ wants to download the font". This is a similar concept: the system is missing a required font and is offering to download it from the internet to avoid substitution. Download Font Substitution Will Occur Continue
If the document uses a custom, rare, or corrupted font that the driver cannot successfully send to the printer, substitution is the fallback mechanism. For Windows power users, it is theoretically possible
Clicking "Continue" or "Yes" lets you view the document, but it can cause several visual problems: A skilled user could add a value to
In the dialog box, look at the top list showing the missing fonts (marked with an alert icon).
Solution 2: Embed Fonts Before Sharing (For Content Creators)
Rather than crashing, the software relies on an automated fallback process: