Password protect your PDFfree & no upload
Add a password to your PDF files instantly in your browser. Keep sensitive documents secure — no file upload, no server, completely private.
Your PDF and password never leave your device. Encryption runs entirely in your browser.
Password protection is applied immediately — no waiting for server processing.
Protected PDFs open in Adobe Acrobat, Preview, Chrome, and all major PDF readers.
How to Password Protect a PDF
- Upload your PDF by clicking the upload area or dragging it in.
- Enter a strong password in the password field.
- Confirm the password to avoid typos.
- Click "Protect PDF" and download the encrypted file.
Frequently Asked Questions
Is there a file size limit?
No hard limit. Processing happens entirely in your browser, so performance depends on your device. Most PDFs of any typical size work fine.
Can I protect a PDF that already has a password?
You'll need to unlock the PDF first using our PDF Unlock tool, then re-protect it with a new password.
What happens if I forget the password?
We cannot recover your password — encryption is done locally and we have no access to your files or passwords. Always keep a note of your password.
Does this work on all PDF readers?
Yes. The password-protected PDF is compatible with Adobe Acrobat Reader, macOS Preview, Google Chrome, and all major PDF viewers.
Use our free online PDF password protect tool to lock PDF files, encrypt PDFs, and secure sensitive documents. This browser-based PDF encryption tool lets you add password protection to any PDF without uploading your file to a server. Ideal for securing contracts, financial reports, personal documents, and confidential files before sharing via email or cloud storage.