PDF password-protection

AES-256 encryption: the strongest available algorithm for password-protecting PDF files. Processing is entirely client side – your document never leaves your device.

Click here or drag and drop your PDF

True PDF password-protection — client side with AES-256. Simple password features can be removed in a few clicks — many “PDF password removal” websites rely on this. We use full content encryption: PDF password-protection with AES-256 and strong key derivation, so the entire document is protected byte by byte.
– Strong protection. Modern PDF password-protection.
– Tip: choose a long, unique password!
– If you are looking for a working PDF password-protection solution, you are in the right place: encryption is strong and processing is 100% client side.

PDF password-protection – strong AES-256 encryption, client side – remove password from PDF, password protect PDF, password PDF document, forgot my PDF password

With this tool you can set a PDF open password and apply content encryption. Processing is fully client-side, so the document is never uploaded. Printing, modification and content extraction restrictions are applied for compatible viewers.

How to use?

Select PDF: click to upload or drag and drop the file.
Enter password: type a strong password (12+ characters with uppercase, lowercase, numbers and symbols).
Encrypt: click Encrypt & save. The output is a new PDF that requires a password to open.
Download: save the file; its name ends with .secured.pdf.

Typical uses

Contracts and NDAs – protect them before sharing.
Invoices and financial reports – secure them before emailing.
HR and medical documents – protect sensitive data.
Project documentation (proposals, specifications) – for secure transmission.
Legal documents – prevent unauthorized access.

Frequently asked questions

What happens during encryption?: The entire document content is encrypted using the AES-256 algorithm; without the password the file cannot be opened.
Does the system set printing/modification restrictions?: Yes. In addition to the open password, printing and modification restrictions are set. Enforcement depends on the PDF reader.
What if I forget the password?: It cannot be recovered. Store it safely; if lost, the content cannot be restored.
Can I encrypt a password protected PDF?: No. Remove the existing protection first, then run the encryption.
How long should the password be?: We recommend at least 12–16 characters with a random combination. Avoid dictionary words and reused passwords.

Related tools: PDF merge, PDF compression, OCR – searchable PDF.