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Protect PDF

Protect PDF

Add a password to your document. Encryption happens in the browser, not on a server.

AES-256100% local protection

Privacy

Your documents do not leave your device.

PDFTasker runs in your browser. No uploads. No server detour. No tricks.

Security guide

  1. 1. Load the file you want to protect.
  2. 2. Enter a strong password.
  3. 3. Save the encrypted PDF without uploading it.

Load document

Document to protect

Load your document. The browser locks it before it goes anywhere.

Drop files here, or tap to choose them.

Password

This is the key to open the document. Do not forget it.

Local encryption

PDFTasker runs AES-256 encryption in the browser without sending the file anywhere.

Lock it in your browser

Set PDF Passwords in Your Browser

Some documents should not travel unlocked — a contract, a payslip, a scanned ID, a board pack. Adding a password is the obvious step, but handing the file to a cloud service to encrypt it rather defeats the purpose. PDFTasker applies the password in your browser with AES-256 encryption, so the document is protected on your device and never uploaded to be secured.

Privacy and trust

No unnecessary compromise

Encrypting a file you consider sensitive enough to protect, by first uploading it to someone else's server, is a contradiction. PDFTasker avoids it: the encryption runs locally, and your password is used on your device and never sent anywhere. You select the file, set a password, and download a new protected PDF — the original and the password both stay with you.

How to use it

How to password-protect a PDF

  1. 01Open the document you want to protect.
  2. 02Enter and confirm a strong password.
  3. 03Click encrypt to protect the file in your browser.
  4. 04Save the password-protected PDF.

FAQ

Protect PDF FAQ

How secure is the encryption?

PDFTasker applies AES-256 PDF encryption in the browser using the password you provide. The real strength still depends on choosing a strong password and sharing it through a separate channel. A weak or reused password can undermine the protection even when the encryption method is strong.

Is my password stored anywhere?

No. The password is used in your browser to create the protected PDF and is not sent to a server by PDFTasker. You still need to manage it carefully. Do not put the password in the same email or message as the protected document or chat.

Will the protected file open in other PDF viewers?

Yes. The protected file follows standard PDF encryption methods supported by major PDF viewers. Some older or limited viewers may behave differently, so open the output in the viewer your recipient will likely use. Confirm that the password prompt appears before sending the file or archiving.

Can PDFTasker recover a forgotten password?

No. PDFTasker does not store passwords or keep a recovery copy. If you lose the password, you may lose practical access to the protected output. Keep an unprotected original in a safe place when your workflow allows it, then share only the protected copy for recovery.

Does protecting a PDF upload the document?

No. Encryption runs locally in your browser after you select the file and enter the password. The output is created on your device as a new protected PDF. That is useful when the document is sensitive enough to protect and should not be uploaded first.

Is a password the same as a watermark or sanitizing the file?

No — they solve three different problems and are often used together. A password controls who can open the file at all. A watermark is a visible label that travels with the page and communicates status to anyone who can see it. Sanitize removes hidden metadata — author names, software traces — that you cannot see but a recipient could find. A sensible order for a sensitive document: finish the content, sanitize the metadata, watermark if status matters, and protect with a password as the final step before sending.

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