Tagging PDF Files

I am looking for a tool with which I can tag PDF files. Ideally, the PDF files should be findable in the NC web interface using these keywords. And the keywords should not be lost when exchanging data between Windows, Debian and macOS.

What about using the Files automated tagging app?

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Thanks. But this by far does not match my approach. I want keywords, been added to a synced file within Nextcloud, to keep being preserved and are being available outside of Nextcloud. With other words: Keywords given to a file in Nextcloud should being displayed in macOS as tags and vice versa tags added to a file in macOS should being recognized by Nextcloud as keywords to the file. Such auxiliary information to a file should being synced lossless between Nextcloud and macOS an iOS as the file itself.