# Encrypt a PDF with password

**Available in [pre-release 3.7](https://www.sumatrapdfreader.org/prerelease)**

## In application

To encrypt a PDF in SumatraPDF:
- open un-encrypted PDF document
- `Ctrl + k` for [command palette](Command-Palette.md)
- `Encrypt PDF`

Or:
- open un-encrypted PDF document
- right-click for context menu
- `Document` > `Encrypt PDF`

## From command-line

To encrypt a PDF with password using SumatraPDF from command-line:

`SumatraPDF clean -E aes-256 -U pwd foo.pdf foo-encrypted.pdf`

Flags:

- `-E` : encryption algorithm
- `-U <pwd>` : password required to open PDF file

You can see [all flags](Tool-clean.md).

You can also [decrypt](Tool-x-decrypt-pdf.md)