Add a password to your PDF
Sending a sensitive document — a statement, contract, or ID — and want to lock it? This tool encrypts your PDF with a password so only people who know it can open the file. Everything happens in your browser using 256-bit AES, so neither the document nor the password ever leaves your device.
Who uses this tool
HR teams sending salary slips that should only be opened by the employee, individuals sharing sensitive documents like ID copies or contracts, freelancers locking invoices before emailing them to clients.
How to password-protect a PDF
- Choose the PDF you want to protect.
- Type a password and confirm it (tick "Show passwords" to double-check).
- Click Protect & download — the protected PDF will ask for that password whenever it's opened.
Frequently asked questions
How do I password-protect a PDF?
Choose your PDF, type a password twice, and click Protect & download. The file will then require that password to open.
What encryption is used?
256-bit AES — the modern standard supported by Adobe Acrobat and all major PDF readers.
Is my PDF or password uploaded anywhere?
No. The PDF is encrypted entirely in your browser; neither the file nor the password is ever sent to a server.
Can I remove the password later?
Yes — if you know the password, use our PDF Password Remover to unlock it again.
What if I forget the password?
It cannot be recovered. Strong encryption means a lost password makes the file permanently inaccessible — store it safely.