One of the most popular alternatives to Okular is SumatraPDF, which is free and open source. Other popular alternatives are Foxit PDF Reader, LibreOffice - Draw, KOReader and Evince. PDF Readers like Okular are a crowded field, with more than 100 alternatives for Windows, Mac, Android, Linux and iPhone.
ZapPDF is the ultimate privacy-first PDF utility. Whether you are dealing with sensitive financial documents, legal forms, or heavy study materials, ZapPDF gives you the power to manage them instantly—without ever uploading your private files to a random cloud server.
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PDFSimplified is an online PDF editor. Edit text in PDF files, create PDFs from scratch or from a prompt, and edit or translate pages with AI.
PDF Guard is a PDF editor that runs inside the browser tab and processes documents on your own device instead of uploading them. Files are read from disk into the tab's memory, handled by engines that run locally - pdf.
