Protecting a PDF with a password on Android is easy without any app. Here is how to encrypt a PDF directly in Chrome on Android — for free.
Navigate to pdfeditor.onl/protect-pdf in Chrome. The tool is fully mobile-optimized.
Tap the upload area and select the PDF from your Downloads folder, Google Drive, or any accessible storage. The PDF is processed entirely on your device — no data leaves your phone.
Tip: For financial documents or documents with personal data, always use the local processing tool rather than cloud-based options that transmit your file to a server.
Enter a strong password — at least 12 characters with a mix of letters, numbers, and symbols. Avoid using your name, birthdate, or common words. Confirm the password in the second field.
Tap Protect & Download. Chrome saves the encrypted PDF to your Android Downloads folder. Test it: try opening the downloaded PDF — it should immediately prompt for the password.
Yes. Locate the protected PDF in Downloads, tap Share, and select WhatsApp as the destination. The recipient needs the password to open it — share the password via a separate channel, not in the same WhatsApp chat.
Yes. Use pdfeditor.onl/unlock-pdf, enter the current password, and download the unprotected version. Then add a new password if needed.