Free Protect PDF (Add Password) Tool

About the Protect PDF

Add a password to a PDF so it can't be opened without it — set a password and download the protected file, all in your browser with no upload.

How to use the Protect PDF

1Add a PDF — drop it in or click to browse.
2Choose a password and confirm it.
3Click Download protected PDF — anyone opening it will need that password.

Frequently asked questions

Is this protect PDF tool free?

Yes — completely free with no sign-up and no watermark on the result.

Is my PDF uploaded anywhere?

No. The password is applied entirely in your browser — the file never leaves your device.

What kind of password protection does this add?

Standard PDF password encryption (RC4 128-bit) — the same protection Adobe Acrobat used by default for years. Any PDF reader will prompt for the password before opening the file.

If I forget the password, can I recover it?

No. Nothing is stored anywhere — if you lose the password, the PDF can't be opened again, by this tool or any other.

Can I remove a password I set earlier?

Yes — use the Unlock PDF tool with the same password to remove it again.

More PDF tools

View all

Image to PDFCombine JPG, PNG and WebP images into a single PDF — reorder the pages and download, all in your browser with no upload.Merge PDFCombine several PDF files into one — add your PDFs, drag them into the order you want and download the merged file, all in your browser with no upload.Split PDFSplit a PDF into separate files — by page ranges, every N pages or one file per page — and download them as a ZIP, all in your browser with no upload.Organize PDFReorder, rotate and delete pages in a PDF from a visual thumbnail grid, then download the rearranged file, all in your browser with no upload.