Password Protect PDF
Add a password to any PDF so it can't be opened without it. AES-256 encryption. Runs entirely in your browser — your file is never uploaded.
Browser-side encryption builds a new PDF from page images, so the output will look identical but its text won't be selectable. For text-selectable encryption you'll need a desktop tool. We surface this so there are no surprises.
Rendering uses pdf.js and the encrypted PDF is built with jsPDF — both in your browser. Your file and password never leave the page.
FAQ
Is my PDF uploaded?▼
No. Rendering, encryption, and the new file build happen entirely in your browser. Nothing ever leaves your device.
Why does the output rasterize my PDF?▼
Browser-side PDF encryption is only available via jsPDF, which builds a new PDF from scratch. To carry over your original content, we render each page at 2× resolution and embed it as an image. The result looks identical but text won't be selectable in the output. If you need text-selectable encryption, use a desktop tool like qpdf.
How strong is the encryption?▼
jsPDF supports AES-256 encryption by default (standard for modern PDF viewers). The user-password is required to open the file; the owner-password (if different) is required to change permissions.
What permissions can I block?▼
By default we allow printing and copying. Toggle the checkboxes to disallow printing, copying text, or annotating — your owner-password is required to change these later.
Is the password recoverable if I forget it?▼
No. The whole point of PDF encryption is that the file is unreadable without the password. Save it somewhere safe (a password manager) before sharing the file.
More PDF Tools
Rotate PDF Free
Rotate PDF pages by 90°, 180°, or 270°. Free PDF rotator that runs in your browser — no upload, no signup, no watermarks.
Text to PDF Free
Convert plain text, TXT files, or HTML into a PDF document in your browser. Free text to PDF converter — no upload, no signup.
PDF to PPT
Convert each PDF page to a slide in a PowerPoint file. Works with PowerPoint, Google Slides, Keynote. Browser-only — no upload.