OpenPDFSign

https://openpdfsign.org

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OpenPDFSign is a command-line tool and server module for cryptographically signing PDF files in...

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### Download Open PDF Sign CLI

Source: https://openpdfsign.org

Download the latest release of the open-pdf-sign.jar file using curl.

```bash
curl -LO  https://github.com/open-pdf-sign/open-pdf-sign/releases/latest/download/open-pdf-sign.jar
```

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### Sign PDF with Invisible Signature

Source: https://openpdfsign.org

Invoke the CLI to sign a PDF file with an invisible electronic signature using a specified certificate and key.

```bash
java -jar open-pdf-sign.jar -i input.pdf -o output.pdf \
     -c /etc/letsencrypt/live/openpdfsign.org/fullchain.pem \
     -k /etc/letsencrypt/live/openpdfsign.org/privkey.pem
```

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### Sign PDF with Visible Signature and Timestamp

Source: https://openpdfsign.org

Sign a PDF file with a visible signature, including a custom image and a timestamp hint, on the last page.

```bash
java -jar open-pdf-sign.jar -i input.pdf -o output.pdf \
     -c /etc/letsencrypt/live/openpdfsign.org/fullchain.pem \
     -k /etc/letsencrypt/live/openpdfsign.org/privkey.pem \
     --page -1 --image mylogo.png \
     --hint "You can check the validity at signaturpruefung.gv.at"
```

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