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ONLYOFFICE 7.5 now features a dedicated PDF editor.
(news.itsfoss.com)
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It either runs in the browser or an electron app, so unlikely that OnlyOffice will be a good fit.
You could try Collabora/Nextcloud Office, which runs the LibreOffice on the server and just streams UI tiles to the clients, so the impact of running that in shifted to the server. Still needs to run a browser though.