Protect PDF
Add or remove a password with AES encryption and permission controls - 100% in your browser.
Drop a PDF here
or click to browse
About this tool
Password Protect a PDF
Add a strong AES-256 password to a PDF so only people with the password can open it.
Never upload an unencrypted bank statement or contract to a cloud tool - do it locally instead.
Encrypt a PDF
Secure sensitive PDFs with strong encryption before sharing or storing them.
Because it is local, your confidential documents stay confidential.
Remove a Password from a PDF
Have a PDF that asks for a password every time? If you know the password, remove it for good.
Decryption happens locally - your file and password are never uploaded.
Frequently asked questions
How strong is the encryption?
You can choose AES-256 (recommended), AES-128, or legacy RC4-40.
Does my password get sent anywhere?
No. Encryption runs in your browser via WebAssembly; the password and file never leave your device.
What encryption is used?
AES-256 by default, with AES-128 and RC4-40 options for compatibility.
Is it private?
Everything runs locally in your browser using WebAssembly. Because no data is uploaded to a cloud server, your files remain strictly private, and the entire process generates zero server carbon emissions, making it highly eco-friendly.
Do I need the password?
Yes. This removes protection from PDFs you can already open with the correct password; it is not a password cracker.
Can it unlock a PDF without the password?
No - you must know the password. This is not a cracking tool.
Is this HIPAA compliant?
KuroPDF processes everything locally - no data is transmitted, stored, or accessible by any third party, which supports HIPAA data minimization principles.
Does this work on iPhone?
Yes - KuroPDF works in any modern browser on iPhone. No app download required.
Does this work on Android?
Yes - KuroPDF works in any modern browser on Android. No app download required.
Does this work on Mac?
Yes - KuroPDF works in any modern browser on Mac. No app download required.
Does this work on Chromebook?
Yes - KuroPDF works in any modern browser on Chromebook. No app download required.
Does this work on iPad?
Yes - KuroPDF works in any modern browser on iPad. No app download required.
Does this work on Windows?
Yes - KuroPDF works in any modern browser on Windows. No app download required.
How do I password protect a PDF?
Open the tool, drop your file, adjust any settings, and click the action button. The result downloads to your device instantly.
Do I need to create an account?
No - KuroPDF is completely free with no sign-up required.
Are my files uploaded?
Everything runs locally in your browser using WebAssembly. Because no data is uploaded to a cloud server, your files remain strictly private, and the entire process generates zero server carbon emissions, making it highly eco-friendly.
How do I remove a PDF password?
Open the tool, drop your file, adjust any settings, and click the action button. The result downloads to your device instantly.
How do I encrypt a PDF?
Open the tool, drop your file, adjust any settings, and click the action button. The result downloads to your device instantly.