PDFThings

Protect a PDF Online

Protect a PDF online with no install and no account. Add or remove password protection from PDF files. Upload up to 20 PDFs per job, process instantly, and download clean output.

Drop a file here, or browse

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Protect a PDF online in your browser — no desktop app, no install, no account. Open the page, drop in your files, and download the result in seconds. Everything runs through an encrypted connection and your files are auto-deleted within 12 hours.

The tool accepts up to 20 PDFs per job, lets you protect them in the order you choose, and produces clean output every time.

Why use this merger

Add a password

Protect a PDF so only people with the password can open it.

Unlock PDFs

Remove a password from a file you're authorized to open.

Choose your own password

Set any password you like when protecting a document.

Secure by design

Transfers are encrypted and uploads auto-delete within 12 hours.

How to protect a pdf online

  1. 1

    Upload your PDF

    Select the PDF you want to protect or unlock.

  2. 2

    Choose protect or unlock

    Pick protect to add a password, or unlock to remove one (you'll need the password).

  3. 3

    Run and download

    Download the protected or unlocked PDF.

Related ways to merge PDFs

Protect a PDF FreeProtect a PDF on WindowsProtect a PDF on AndroidAll Protect PDF features

Frequently Asked Questions

Is protecting PDFs online safe?
Yes. Files are uploaded over an encrypted connection and automatically deleted from our servers within 12 hours.
Do I need to create an account?
No. The tool works without registration — upload, process, and download.
How many files can I protect at once?
You can protect up to 20 PDFs per job in a single job.