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PdfViewer
Simple Android PDF viewer based on pdf.js and content providers. The app doesn't require any permissions. The PDF stream is fed into the sandboxed WebView without giving it access to content or files. CSP is used to enforce that the JavaScript and styling properties within the WebView are entirely static.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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To keep it updated, use https://github.com/GrapheneOS/Apps/releases
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PDF Converter, can remove password protection altogether if needed & is a great tool, then view in MJ PDF
NOTE:
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Hence, a higher number means a more popular project.