Add Password to PDF
Choose PDF files and a password; each file is encrypted with AES-256 so it asks for the password when opened. Protected in your browser.
- Runs in your browser
- Free to use
About this tool
Contracts, payslips and medical reports should not travel as open files. Add Password to PDF encrypts PDFs with AES-256 in your browser, with an open password and an optional owner password that allows printing but blocks editing and copying, for up to 25 files at a time, nothing uploaded.
Related: PDF Password Unlock, PDF Metadata Remover.
How to use it — quick steps
- 01
Add the PDF files
Drop the files on the dashed area or choose them, up to 25 files of 50 MB each per run.
- 02
Set the password
The open password is needed to read the file; an optional owner password controls printing and copying.
- 03
Press "Add password"
Each file is encrypted with AES-256 in your browser; download them one by one or as a .zip.
Key features of this tool
AES-256 encryption
Standard PDF security that Acrobat, browsers and every PDF reader understand.
Open and owner passwords
One password to open; optionally a second one for the owner, with printing allowed and editing or copying blocked.
Nothing leaves your browser
Files and passwords stay on your device; nothing is uploaded or stored.
Frequently asked questions
What is the owner password for?
It unlocks the restrictions (editing, copying) while the open password only lets people read the file. If you leave it empty the open password is used for both.
I forgot the password
It cannot be recovered; keep the original unprotected file somewhere safe.
Can I protect an already protected PDF?
Remove the existing password first with PDF Password Unlock, then add the new one.
Are my files or data uploaded?
No. The tool is plain JavaScript that runs in your browser; the files or data you provide here are never uploaded to our servers.