Protect PDF
Add a password to a PDF with AES-256 encryption, with optional permissions. Your PDF and password stay on your device.
Drop a PDF to protect
One PDF · up to 50 MB · protected with AES-256 on your device
AES-256 encryptionYour PDF and password stay on your deviceNo signup
How it works
- Choose or drop the PDF you want to protect.
- Enter a password twice, or generate a strong one and copy it.
- Optionally open Advanced permissions to limit printing, copying or editing.
- OneDo Hub encrypts the PDF with AES-256, checks it, and you download it.
Privacy
Encryption runs inside your browser. Your PDF, its passwords and the file name are not uploaded, never saved and never sent to analytics. Passwords are cleared as soon as protection finishes.
Supported formats
One PDF up to 50 MB and 2,000 pages. New files are protected with AES-256. Pages, text, fonts, images, links, bookmarks, comments, forms, attachments and metadata are kept; nothing is turned into images. Passwords can't be recovered by OneDo Hub. Permission restrictions depend on the PDF reader. Protecting a digitally signed PDF invalidates its original signature. Already protected PDFs must be unlocked first.
Frequently asked questions
What protection does OneDo Hub use?
New PDFs are protected with AES-256 encryption.
Does my PDF or password upload anywhere?
No. Protection runs in your browser.
What if I forget the password?
OneDo Hub does not store or recover passwords. Keep a safe copy before downloading the protected PDF.
Can I prevent printing or copying?
Advanced permissions can request restrictions such as printing or copying, but enforcement depends on the PDF reader.
Can I protect an already locked PDF?
Unlock it first using its valid owner/permissions password, then protect the unlocked copy.
Will protection reduce PDF quality?
No. Protection encrypts the PDF without turning its pages into images.
Related tools
Unlock PDF
Remove a PDF's password using the password you know.
Remove PDF Metadata
See and remove author, title, dates and software info.
PDF Editor
Sign, fill forms, add links, bookmarks, text and images, checked before download.
Compress PDF
Reduce PDF file size, or hit a target like 500 KB.