Add a password to your PDF directly in the browser. Set a user password to open the document and an owner password to restrict editing, printing and copying. 100% private, no server upload, no installation.
Drag the PDF to protect here
or drag the file here
or open the full PDF editor for annotations, signatures and much more.
Drag the PDF or click to select it. The file never leaves your device.
Choose a user password to open the PDF and, optionally, an owner password to lock editing and copying.
Click "Protect PDF" and the encrypted file is downloaded immediately. Share it safely.
Everything runs in the browser via WebAssembly. Your PDF is never sent to any server.
No upload, no queue. Processing is local and completes in seconds even for large files.
No required account, no credit card, no watermark. Truly free.
PC, Mac, iPhone, Android — just a modern browser. Safari, Chrome, Firefox or Edge.
Protecting a PDF with a password prevents unauthorised people from opening or modifying the document. OnlinePdfEditor supports two levels of protection: an opening password (required to view the document) and an editing password (required to modify, print or copy content).
Encryption is applied in the browser using AES-256, the industry standard for PDF document protection. The protected file is compatible with all major PDF viewers: Adobe Acrobat, Foxit, Preview, Chrome and Edge.
The password is never transmitted to external servers: the encryption process happens entirely on your device.
The user password (or open password) is required to view the PDF. The owner password (or permissions password) restricts operations such as printing, copying text and editing, even without blocking the document from opening.
OnlinePdfEditor applies AES-256 encryption, the most robust standard for PDF files, compatible with Adobe Acrobat Reader and all major PDF readers.
If the PDF is already protected you will first need to unlock the document by entering the original password. Once opened you can apply new protection.
Yes. PDFs protected with standard AES-256 password are compatible with Adobe Acrobat, Foxit, modern browsers and mobile apps on iOS and Android.
No. Protection happens entirely in the browser. No files are sent to external servers.
Use our "Unlock PDF" tool: upload the protected file, enter the current password and get a copy without protection.
Free, in the browser, nothing to install. Upload your PDF and go.
This site uses technical cookies and Google Analytics to improve your experience. & .