Add a password to a PDF
Open your PDF
Click "Choose file" or drag your PDF into the tool. The file is loaded locally in your browser and never sent anywhere.
Set your passwords and permissions
Enter a user password (required to open the document) and an optional owner password to restrict printing, copying, or editing. Both are applied with 128-bit AES encryption.
Download the protected PDF
Click "Protect PDF" and download the encrypted file instantly. The original file is untouched; you get a new, locked copy ready to share.
PDFsuite encrypts your document entirely inside the browser using 128-bit AES, the same standard used by banks and government agencies. Because the file never leaves your device, there is no risk of interception during processing. Encryption happens locally, and no internet connection is required once the page has loaded.
You can set two separate passwords: a user password that recipients must enter to open the file, and an owner password that controls document permissions such as printing, copying text, and making edits. This dual-password model matches the PDF specification and is compatible with Adobe Acrobat, Preview on Mac, and every major PDF reader.
Protecting a PDF before emailing it is the single most effective step you can take to keep sensitive documents private. Whether you are sharing contracts, financial statements, or personal records, a strong password ensures that only the intended recipient can read the content. No cloud service stores your file - just open, encrypt, and download.