Protect files in your browser

Protect PDF

Add a password to your PDF and download the protected file easily.

Drag & drop a PDF to get started, or click to browse.

Accepted type: PDF

No file selected

Upload a PDF to continue.

File size -

Output name -

Output file name

The tool adds ".pdf" automatically if needed.

Password

This tool only adds password protection. It does not edit page content, images, or text.

Confirm password

Password strength guidance

Add at least 8 characters. A mix of letters, numbers, and symbols is best.

Ready to protect

Upload a PDF and set a password to begin.

Waiting 0%

If your browser previews the file first, use your browser save or share option to keep the protected PDF.

Helpful notes

This tool adds password protection only. It does not intentionally edit text, images, or layout.
Different PDFs can have very different internal structures. This version preserves object streams and unreferenced objects to maximize compatibility.
Files stay in your browser during processing. The protection engine is loaded once from a CDN when needed.
You will need the same password every time you open the protected PDF in a reader.

If a PDF is malformed or blocked by a browser extension, the tool shows a real error instead of pretending the file was protected.

Add password protection to PDF files so only authorized people can open them. Keep contracts, financial records, and personal documents secure.

100% free · No watermarks · No sign-up required · Secure browser processing