Protect PDF
Password-protect a PDF file.
Reliable PDF encryption requires a server-side library, since no maintained browser-only library implements the PDF standard security handler correctly. This tool is not yet available — we won't ship a version that silently fails to protect your file.
This tool is coming soon
Reliable PDF encryption requires a server-side library, since no maintained browser-only library implements the PDF standard security handler correctly. This tool is not yet available — we won't ship a version that silently fails to protect your file.
- Free — no signup, no account, no watermark
- Works on mobile, tablet and desktop
- Instant — results appear as soon as you enter your input
Overview
Adds password protection and encryption to a PDF using the PDF standard security handler.
How to use it
- 1This tool is not yet available. See the note above for why.
Tips
- We'd rather ship this once it can run reliably (via a server-side processing step) than ship a client-only version that produces PDFs some viewers report as unprotected.
Related guides
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- How to compress a PDF to under 1 MBA 1 MB upload limit is common on application portals. Here's what's realistic, how to get there, and when 1 MB simply isn't possible without losing the text.
- How to compress a PDF for email attachmentsGmail, Outlook and most providers cap attachments around 20–25 MB. Here's how to get a PDF under the limit — or send it without shrinking it at all.
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Protect PDF