Protect PDF
Add password protection to your PDF files. AES-256 encryption, 100% in your browser.
Add password protection and AES-256 encryption to your PDF files. This prevents unauthorized users from opening, copying, or printing your sensitive documents. Essential for contracts, financial reports, medical records, and any confidential material shared digitally.
You set the password, and the tool encrypts the entire document in your browser. The encrypted PDF can only be opened by someone who knows the password. Since encryption happens client-side, your unprotected document is never sent to any server.
Drop your PDF file here to protect
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Frequently Asked Questions
How to Password Protect a PDF
Add AES-256 encryption and password protection to any PDF file. This prevents unauthorized access — the recipient must enter the correct password to open and view the document. Essential for contracts, financial documents, medical records, and any sensitive information.
- Upload the PDF you want to protect.
- Enter a strong password (we recommend 8+ characters with mixed case, numbers, and symbols).
- Click "Protect PDF" to encrypt the file.
- Download your secured PDF and share it safely.
AES-256 is the same encryption standard used by governments and financial institutions. Once protected, the PDF cannot be opened without the correct password. Remember to share the password with your recipient through a separate channel (like a phone call or text message) — never include it in the same email as the file. **Why Local Encryption Matters:** When you use cloud-based PDF protectors, you are uploading your unencrypted, highly sensitive document to a remote server and trusting them to delete it. Our tool runs locally. The file is encrypted directly inside your computer's memory, ensuring true zero-knowledge privacy.
Frequently Asked Questions
How do I password protect a PDF for free?
Upload your document to our tool, type a secure password, and click protect. The tool will download a new, encrypted copy of your PDF without charging you any fees.
Can someone brute-force the PDF password?
Because we use AES-256 encryption, brute-forcing a strong password (8+ mixed characters) would take modern supercomputers millions of years. However, a weak password like "1234" can be easily guessed, so always choose complex passwords.
Is it safe to encrypt financial records online?
Yes, but only if processing is 100% client-side. TinyPDFTools never uploads your file, meaning your financial records are never exposed to the internet.
Can I lock a PDF from being printed or copied?
Currently, our tool applies an "open" password, meaning the entire document is locked from being viewed. We plan to add specific permission controls (like disabling printing) in a future update.