Protect PDF online

Protect PDF, free and fast, right in your browser.

Drag & drop your PDF here, or click to choose a file

MarqPDF encrypts your PDF with a password in a couple of clicks. Upload, run it and download the result. No install, first downloads free.

How to password-protect a PDF

1) Upload your file. 2) MarqPDF encrypts your PDF with a password. 3) Download the result.

Edit the text too

Need to change a word, a date or a figure as well? Edit the PDF in place; the rest of the page stays where it was.

Frequently asked questions

Is Protect PDF free?

Free to try: no signup, no install, no watermark. Downloading needs a free account, which includes 2 exports; after that, a Week Pass ($6.99) or Pro ($14.99 a month), see pricing.

Do it from code or an AI agent

The same tool is in the MarqPDF API as POST /v1/protect, and in MarqPDF's MCP server as protect_pdf for Claude, Cursor and other AI agents.

curl https://marqpdf.com/v1/protect \
  -H "Authorization: Bearer $MARQPDF_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"file": "file_…", "password": "…"}'

API reference · Use it from an AI agent (MCP) · JavaScript and Python SDKs · Chain it with other steps