Protect PDF
Add AES-256 password encryption locally. Keep your password safe, we cannot recover it.
or drop it here
Maximum 50 MB. Original files remain unchanged.
0 KB uploaded. Your file never leaves this browser tab.
Open your browser's Network tab while you use this tool, you will see zero data sent to any server.
How to use
1. Choose a PDF
Up to 50 MB.
2. Set a password
Your file and password stay on this device.
3. Download
Save a new copy of your document.
FAQ
Does this preserve my PDF?
QPDF rewrites encryption without rasterizing pages. Text, images, and forms are retained. Rewriting a signed PDF can invalidate its digital signatures.
What encryption is used?
Protection uses AES-256. Unlocking requires the correct password for standard PDF encryption. Unsupported or malformed files produce an error, not a success result.
Are my files uploaded?
No. The QPDF engine runs in a local Web Worker. Its code is downloaded from this site; your document and password are never sent to a server.
What about older protected exports?
Exports from the earlier IYONM implementation were not encrypted and could contain the entered password in metadata. Do not rely on them. Change any password reused for other accounts.