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Add password protection to any PDF. Lock your document so only people with the password can open it. No upload, no watermark.
Password-protect any PDF instantly — no upload, no watermark, no account. Enter a password, and your PDF is encrypted so only people with the password can open it. Unlike online tools that upload your sensitive documents to their servers, everything runs in your browser using pdf-lib. Your file and password never leave your device — the most private way to protect a PDF.
Drop your PDF, enter a password (and confirm it), then click Protect. The encrypted PDF downloads instantly. Anyone who tries to open it will be prompted for the password.
The tool applies standard PDF encryption. The strength depends on your password — use at least 8 characters with a mix of uppercase, lowercase, numbers, and symbols. PDF encryption is designed for access control and is sufficient for most business and personal use cases.
Yes. Use our Unlock PDF tool to remove the password. You'll need to enter the original password to unlock it.
No. Everything runs in your browser. Your file and password never leave your device — completely private and secure. This is actually more secure than uploading to a cloud service.