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Private by design · 100% on-device

Password Protect PDF

Add a password to a PDF right in your browser. Encrypt the file so only people with the password can open it — no uploads, no sign-up, no watermark.

Drop a PDF to protect

Add an open password so only people with it can read the file.

  • No uploads
  • No sign-up
  • No watermark
  • Works offline

How it works

How to password-protect a PDF

Three quick steps, all in your browser. Your file never leaves your device.

  1. 01

    Add your PDF

    Drop a PDF into the box above or browse for it. The file loads straight into your browser — it is never uploaded to a server.

  2. 02

    Set a password

    Type the password you want to require, then confirm it. This becomes the password anyone needs to open the document.

  3. 03

    Encrypt and download

    Click Protect PDF and save the encrypted file instantly. From now on it asks for your password before it will open — no watermark, no account.

Features

Everything the PDF protector does

One focused tool for locking a document with a password — without a subscription or a single upload.

Real PDF encryption

Your document is encrypted with a password using the standard PDF security supported by every major reader — not a flimsy lock screen.

Open password

The password is required before the PDF will open at all, so the contents stay private even if the file is forwarded or leaked.

Works everywhere

The protected PDF opens with a password prompt in Adobe Acrobat, Preview, Chrome, Edge, and on phones — anywhere PDFs are read.

Never uploaded

Encryption runs in your browser's memory. Your file and your password never travel to a server, so nothing can be intercepted.

No watermark, ever

Your protected PDF comes out clean — no stamps, no branding, no trial badge. Just your document, encrypted.

Works offline

Once this page has loaded you can disconnect entirely. Protecting your PDF keeps working with zero network access.

Privacy

Your PDF never leaves your device

Adobe, Smallpdf, and iLovePDF upload your file to a server to encrypt it — and several make you sign in first. PDFNEO does all of the encryption locally, so your document and password stay private.

Protect a PDF now

PDFNEO

  • Encrypts files in your browser's memory
  • Your password never leaves your device
  • No account, email, or sign-up required
  • No watermark and unlimited use

Typical cloud tools

  • Upload every document to a remote server
  • Often require an account to encrypt or save
  • May add watermarks or daily limits
  • Leave copies of your files in the cloud

Use cases

When to password-protect a PDF

Locking a sensitive document is one of the most important privacy steps — here is where it helps every day.

  • Lock a contract before emailing it to a client
  • Protect a payslip, invoice, or bank statement
  • Secure medical or legal records you need to share
  • Add a password to tax documents before sending
  • Keep a confidential report private in shared storage
  • Protect an ID scan or passport copy you must send

Why PDFNEO

Protect PDF vs. the alternatives

Most online tools upload your confidential document to encrypt it. PDFNEO was built the opposite way — and that changes everything about privacy and trust.

Truly private encryption

Your file and password are processed in your browser and never uploaded. Sensitive documents never touch a third-party server.

Instant, no round-trip

There is no upload wait and no download queue. Encryption happens on your device the moment you click.

Free with no catches

No daily limits, no premium gate, no watermark, and no account. Protect as many PDFs as your device can handle.

Keep going

Other PDF tools you might need

Keep working privately. Every PDFNEO tool runs in your browser with no uploads.

Unlock PDF

Remove the password and restrictions from a PDF you own, so it opens without a prompt.

Open tool

Compress PDF

Re-encode page imagery to trim megabytes while keeping pages readable.

Open tool

Merge PDF

Drag several PDFs together, set the order, and export a single clean document.

Open tool

Split PDF

Extract page ranges or slice a document into separate files in one pass.

Open tool

FAQ

Frequently asked questions

Everything about adding a password to a PDF with PDFNEO.

How do I password-protect a PDF for free?
Add your PDF to the tool at the top of this page, type and confirm a password, then click Protect PDF and download the encrypted file. It is completely free, with no sign-up and no watermark.
Can I add a password to a PDF without uploading it?
Yes. Unlike most online tools, PDFNEO never uploads your file. The PDF is encrypted locally in your browser's memory, so the document and the password stay entirely on your device.
What kind of encryption is used?
Your PDF is encrypted with standard PDF password security that every major reader understands. The password is required to open the document, and the contents are scrambled until it is entered correctly.
Will the protected PDF open on any device?
Yes. The encrypted file opens with a password prompt in Adobe Acrobat, Apple Preview, Chrome, Edge, and on Android and iOS — anywhere PDFs are normally read.
What happens if I forget the password?
There is no recovery option. Because the file is encrypted on your device and the password is never stored anywhere, no one — including us — can unlock it for you. Keep the password somewhere safe.
Can I remove the password later?
Yes. Use the Unlock PDF tool, enter the password, and download a copy with the protection removed. You stay in control of the file the whole time.
Is it safe to protect PDFs online with PDFNEO?
It is private by design. Your PDF and password are handled in your browser and are never sent to a server or third party. Close the tab and every trace of the file is gone.
Can I protect a PDF on my phone?
Yes. The tool is fully responsive and works in any modern mobile browser. Add your PDF, set a password, protect it, then save the encrypted file to your device.

Ready to protect your PDF?

Drop in your file, set a password, and download an encrypted PDF in seconds. No account, no upload, no watermark.

Protect PDF