This leads to the absurd situation that when you do save a document with highlights, it often forgets the last of those, but when you don’t save the document, it seems to save it even if you didn’t want it to. Select the unhighlighted text again, and sometimes the highlighting reappears spontaneously if the highlighting is still there, that can also force it to vanish again.įurthermore Preview won’t let you close a document, even when it still indicates that it hasn’t been saved, without saving it silently for you. Click on the highlight tool (not the popup to the right of the tool itself) in the toolbar, and sometimes that applies a different highlight colour (which isn’t even selected in the popup), other times it will remove the highlighting altogether. Select something else, then select that highlighted section again.
Select a section of text and highlight it. This appears to be because the final highlighting is tacked onto the end of the PDF code, where Preview seems to forget it. That is until you select the last highlighted text, when it suddenly remembers it again, as do all third-party apps. Save that document, open it again and chances are that Preview has forgotten the last of those highlighted sections. Open a copy of a regular PDF in Preview, and use the Highlight Text command in Annotations to highlight several sections of text. Even now in Catalina, Preview version 11.0 remains a mess, and has some upsetting bugs. But many use it to read PDFs and to add annotations to them, which aren’t particularly demanding requirements.
Preview isn’t, of course, a ‘serious’ PDF editor. One obvious result is that Preview acquired its own bugs in handling PDFs, and hasn’t really recovered yet. Among the apps which had to do this was Apple’s own Preview. The new version broke a lot of existing code, and developers were forced to work around those bugs. A few years ago, Apple decided to completely rewrite its support for PDFs in PDFKit and Quartz2D.
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