NoApp / PDF & Documents

Protect PDF

Runs locally

Add a password and encryption to keep a PDF private.

What is Protect PDF?

Protect PDF adds a real password to a PDF, so anyone who opens it — in Acrobat, Preview, Chrome, or any standard reader — has to type the password first. The file is encrypted with AES-256 using the PDF standard security handler, and all of it happens inside your browser tab: your document and your password are never uploaded, never logged, and never leave your device.

How to use Protect PDF

Add your PDF
Drop a PDF in or click to browse. It's read straight into this browser tab — nothing is sent to a server.
Choose a password
Type the password you want readers to enter. It must be at least 8 characters, and a strength meter shows how solid your choice looks as you type.
Confirm it
Re-enter the same password in the confirm field. Since a forgotten password can't be recovered, this catches typos before the file is encrypted.
Protect and download
Click Protect & download. The PDF is encrypted in your browser and saved as <name>-protected.pdf, ready to send.
Test before you share
Open the downloaded file in your PDF reader and check it asks for the password. Store the password somewhere safe — a password manager is ideal.

Common uses

Email a contract, invoice, or payslip without leaving it readable to anyone who gets the file
Protect scanned ID documents, bank statements, or medical records before sharing
Lock a confidential report so only the intended recipients can open it
Add a password to tax paperwork before sending it to an accountant
Keep sensitive HR or legal documents private in shared cloud storage
Secure a PDF on a USB stick or external drive in case it's lost

Why use this on NoApp?

100% private

Your files are processed inside your browser and are never uploaded to a server.

Free, no account

No sign-up, no watermark, no paywalled “premium” tier. Just open a tool and use it.

Instant

No upload, no queue, no server round-trip — work starts the moment you drop a file.

Runs in your browser

Built on open web standards. Works on any modern desktop browser, nothing to install.

No upload size caps

Nothing leaves your device, so there’s no server file-size limit — only your machine’s memory.

Yours to keep

Results download straight to your device in clean, standard file formats.