PrivConvert

PDF tool

Protect PDF

Require a password to open a PDF.

Add your input

Your file stays in this browser.

Settings

Good to know1 file · 100 MB max · 500 pages max
Upload a PDF fileResult: PDF file
  • Your PDF stays in this browser while the tool runs.
  • Encrypted or damaged PDFs may need to be unlocked or repaired before this tool can read them.
  • This tool preserves page artwork where possible, but it does not rewrite original PDF text like a word processor.
  • The output PDF requires the password to open.
  • Keep the password somewhere safe; this tool cannot recover it later.

Next tools

Keep working with this file

UnlockRemove PDF encryption with a valid password.MetadataRead, update, or clear common PDF metadata fields.Compress PDFShrink a PDF with image optimization, lossless cleanup, or flattened page compression.Add imagePlace a PNG or JPG image on top of one PDF page.

How it works

How to use Protect PDF online

  1. Upload a PDF file. The tool validates the published file type and size limits before the run.
  2. 1 adjustable setting. Review these settings before processing.
  3. Run the tool in your browser, review the result, and download the pdf file.

Overview

Protect PDF with local-first browser processing

Require a password to open a PDF. Review supported input, output format, settings, browser requirements, and practical limits before starting.

Input

Upload a PDF file

Output

PDF file

Limits

1 file · 100 MB max · 500 pages max

Best for

Protect PDF use cases

  • Prepare the pdf file for sharing, archiving, or another file workflow.
  • Process the job in your browser without creating an account.
  • Check the published limits before processing larger or unusual inputs: 1 file · 100 mb max · 500 pages max.

Processing

What happens in your browser

PrivConvert uses PDF password protection for this workflow. 1 adjustable setting. This tool checks for wasm support before running

Your PDF stays in this browser while the tool runs.

Related tools

Unlock PDFPDF MetadataCompress PDFAdd Image to PDFAdd Image WatermarkAdd Page Numbers

FAQ

Protect PDF questions

See how privacy works

Is Protect PDF free to use?

Yes. This tool is free to use in your browser and does not require an account.

Are my files private?

Protect PDF uses PDF password protection in the browser. Selected files are processed locally when the required browser features are available, while application, library, model, security, and limited analytics requests may load separately.

What limits should I know about?

1 file · 100 MB max · 500 pages max. Encrypted or damaged PDFs may need to be unlocked or repaired before this tool can read them.