Protect PDF with Password
Contracts, ID documents, medical records: some files shouldn't travel naked. Add a password so the PDF can only be opened by someone who has it: AES-256 encryption, free, no sign-up.
Uploaded for temporary server processingSelect a PDF or drag & drop
One PDF, up to 25 MB
This tool uploads your file to our server. Protect PDF with Password needs server-side processing, so your file is sent over HTTPS and handled using temporary server files in a separate job directory. Cleanup is attempted when processing ends, but immediate or secure deletion cannot be guaranteed. Don't use this tool for files you can't upload to a third party.
How to protect pdf with password
- Select your PDF. Choose or drag in the document to protect.
- Set a password. Enter it twice. Anyone with it can open the file; without it, no one can.
- Encrypt. Press Protect PDF. Your file is sent over HTTPS and encrypted on our server with AES-256 using temporary files.
- Download. Download the protected PDF and share the password through a separate channel.
Want more detail? Read our full guide: How to password-protect a PDF.
Why password-protect a PDF?
Once a document leaves your hands, it travels further than you intended. An email attachment passes through several mail servers and sits in inboxes you don't control; a shared cloud link tends to outlive the moment you meant it for; a forwarded file can be opened by anyone it's forwarded to. When that file carries personal, financial, medical or legal details, protecting the folder or the link isn't enough: the protection has to live inside the document, so it holds wherever the file ends up.
A password does exactly that. Encrypting the PDF with AES-256 (the standard every modern reader supports) scrambles the actual page content, so without the password the file is unreadable noise rather than a locked door someone can pick. This is worth doing before you send things like:
- Bank statements, tax forms and pay slips
- Scans of passports, IDs and other identity documents
- Medical records and insurance paperwork
- Signed contracts and confidential business reports
One habit makes all the difference: send the password through a different channel than the file. If you email the PDF, text or call with the password. Mailing both together is like taping the key to the box. And remember there is no back door; if the password is lost, the file genuinely can't be recovered, so store it somewhere safe.
This tool uses qpdf on our server, so your file is sent over HTTPS and encrypted using temporary server files in a separate job directory. Cleanup is attempted when processing ends, but immediate or secure deletion cannot be guaranteed.
Frequently asked questions
Is my file uploaded?
Yes. This tool uses qpdf on our server. Your file and chosen password are sent over HTTPS. The file is processed using temporary server files in a separate job directory; cleanup is attempted when processing ends, but immediate or secure deletion cannot be guaranteed.
What encryption is used?
AES-256, the current standard for PDF encryption, supported by every modern PDF reader and recommended over the legacy 40/128-bit formats.
Can the password be recovered?
No. There is no back door: not for us, not for your recipient, not for anyone. If the password is lost, the file is unreadable. Store it somewhere safe.
How should I share the password?
Through a different channel than the file itself: if you email the PDF, text the password. Sending both together is like taping the key to the lock.
Can I remove the password later?
Yes. With the password, the Unlock PDF tool removes it. That's useful once a document no longer needs protecting, or to let a recipient work with it freely.