Are my files uploaded anywhere?

No. PDFs are opened entirely in your browser using pdf.js. Nothing is sent to a server.

Does it support text selection and copy?

Yes. PDFs with a text layer let you select and copy text. Scanned PDFs without OCR will show pixels only.

What about password-protected PDFs?

You'll be prompted to enter the password locally; it never leaves the page.

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Portable Document Format — fixed-layout documents.

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About PDF

Portable Document Format — fixed-layout documents.

PDF is the world's most common fixed-layout document format. It preserves typography, vector graphics, and embedded fonts across operating systems, which is why contracts, manuals, papers, and forms all settled on it. Our viewer renders PDFs locally with pdf.js, the engine that ships inside Firefox, so the experience matches what your browser already knows how to do — minus the chrome.

FAQ

Are my files uploaded anywhere?: No. PDFs are opened entirely in your browser using pdf.js. Nothing is sent to a server.
Does it support text selection and copy?: Yes. PDFs with a text layer let you select and copy text. Scanned PDFs without OCR will show pixels only.
What about password-protected PDFs?: You'll be prompted to enter the password locally; it never leaves the page.