Password Protect a PDF Online
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.
- 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.
- 02
Set a password
Type the password you want to require, then confirm it. This becomes the password anyone needs to open the document.
- 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 standard PDF security (128-bit RC4) that every major reader supports - 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.
What password protection does
Protecting a PDF adds an open password, so the file asks for that password before it will show its contents. PDFNEO sets the same password as the owner and user password and grants all permissions; the goal is to require a password to open the file.
Encryption strength and its limits
The encryption engine in this tool writes the standard PDF security handler with 128-bit RC4 keys. It works in every major PDF reader and is enough to keep casual readers out, but it is an older algorithm and not a substitute for modern AES-256 encryption. For highly sensitive documents, use a long, unique password and consider an encryption tool that supports AES-256.
There is no password recovery. The password is never stored, so keep it somewhere safe.
Privacy and related tools
Your PDF and password stay in your browser. See are online PDF tools safe? for why that matters. To remove a password you know, use Unlock PDF. To permanently hide text before sharing, use Redact PDF.
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.
See how PDFNEO processes your files or read client-side vs cloud PDF tools.
Protect a PDF nowPDFNEO
- 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 toolCompress PDF
Re-encode page imagery to trim megabytes while keeping pages readable.
Open toolMerge PDF
Drag several PDFs together, set the order, and export a single clean document.
Open toolSplit PDF
Extract page ranges or slice a document into separate files in one pass.
Open toolLearn
Read the guide
FAQ
Frequently asked questions
Everything about adding a password to a PDF with PDFNEO.
How do I password-protect a PDF for free?
Can I add a password to a PDF without uploading it?
What kind of encryption is used?
Will the protected PDF open on any device?
What happens if I forget the password?
Can I remove the password later?
Is it safe to protect PDFs online with PDFNEO?
Can I protect a PDF on my phone?
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.