📄 Publisher file won't open on Mac
Microsoft Publisher has never had a Mac version, so macOS has no built-in way to open .pub files and no default app is assigned to them. The most practical fix is to convert the .pub file to PDF, which opens natively on any Mac with Preview.
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About .pub to PDF conversion
Why does my Mac say it doesn't know how to open a .pub file?
Publisher is a Windows-only application and Microsoft never released a Mac version. Unlike Word or Excel, which have Mac equivalents, there is no official Microsoft app on macOS that reads .pub files, so the operating system has nothing to assign them to.
How do I convert a .pub file to PDF on a Mac without installing anything?
Upload your .pub file to OpenAny.io and select PDF as the output format. The converted file downloads to your Mac in seconds and opens directly in Preview or any browser. No account or software installation is needed.
Will the PDF conversion preserve my Publisher layout, fonts, and images?
For most standard Publisher documents the layout, images, and embedded fonts carry over accurately. Complex documents that use unusual fonts not embedded in the file may show substitutions, and some interactive or form elements from Publisher will be flattened, but the visual result is typically very close to the original.