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Add a password and AES encryption to a PDF.
Drop your files here
or browse, or paste from clipboard
PDF files
Processed in your browser - never uploaded
Protect PDF adds a password and AES-128 encryption to any PDF, so the file can only be opened by someone who knows the password. It's a simple way to keep sensitive documents - bank statements, contracts, medical records, ID scans - private before you email them, upload them, or store them in the cloud.
Everything happens right in your browser. Your PDF is encrypted on your own device using built-in web cryptography, and the file is never uploaded to a server. The password you choose stays on your device and is never sent anywhere, so no one - not even us - can see your document or recover your password for you.
Because the encryption is real and the password lives only in your head, there's one honest catch: if you lose or forget the password, the file cannot be unlocked. Choose something you'll remember (or save it in a password manager) before you protect an important document.
Select your PDF
Drag your PDF into the tool or click to choose it from your device. The file is loaded straight into your browser and stays there - it is not sent to any server.
Set a password
Type the password you want to use to lock the PDF, then re-enter it to confirm. Pick something strong but memorable, since this exact password will be required every time the file is opened.
Encrypt the file
Click Protect to apply AES-128 encryption in your browser. Everything is processed locally on your device, so larger files may take a moment depending on your computer.
Download the protected PDF
Save the newly encrypted PDF to your device. Anyone who opens it in a PDF reader will now be prompted for the password before they can view it.
Store your password safely
Keep the password somewhere secure, such as a password manager. If it is lost or forgotten, the file cannot be recovered - not by you or by anyone else.
The PDF is encrypted entirely in your browser and is never uploaded to a server. This makes it a safe choice for confidential documents you would not want passing through someone else's system.
The tool applies genuine AES-128 encryption, the same standard used to secure sensitive data across the web. The PDF cannot be opened, read, or previewed without the correct password.
You choose the password, and it never leaves your device or reaches us. Because we never see it, we can't access your document - and we can't recover the password if you lose it.
There's no account to create, no email to hand over, and no watermark added to your file. Just open the tool, protect your PDF, and download it.
Most online PDF tools upload your document to a server to process it. This one does not. Every operation runs inside your own browser using WebAssembly, so your files are read, processed, and saved locally - they are never transmitted, stored, or seen by Sapphire Broking or anyone else. That makes it safe to use with financial statements, contracts, and identity documents.
No. The entire process runs inside your browser, so your PDF and password stay on your device and are never uploaded or stored anywhere.
There is no way to recover it. The encryption is real and the password is only known to you, so a lost password means the file can no longer be opened - keep it somewhere safe.
The tool applies AES-128 encryption, a widely trusted standard, directly in your browser. The file cannot be opened without the correct password.
Yes. Standard readers like Adobe Acrobat, Chrome, Preview, and mobile PDF apps will simply ask for the password before opening the file.
This tool only adds a password; it doesn't remove one. To unlock a protected PDF, open it with the password in a PDF app that lets you re-save it without protection, or use a dedicated unlock tool.
No. Your pages, text, and images stay exactly the same - the tool only wraps the file in password-based encryption and adds no watermarks.
Keep going
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