> For the complete documentation index, see [llms.txt](https://docs.signius.eu/manuals/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.signius.eu/manuals/harmony-desktop-en/signing/pdf-documents-pades-in-securedoc.md).
# PDF Documents (PAdES in SECUREDOC)
1. Open SecureDoc application.
2. Choose PAdEX fromat in the "Signing" tab.
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4. To add a timestamp, go to "Settings" tab, click "Timestamp Settings" and enter timestamp server data. Alternatively you cen select a variant without timestamp.
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7. Add the file(s) by clicking "Add File" in the "Signing" Tab.
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9. You will see the list of your documents below. Select files to sign and click "Sign files".
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11. Click "Personal certificates", select your certificate and click OK. If you can't see uour certificate make sure, that Harmony Desktop is running and click "Refresh".
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13. Enter your OTP code (SMS token). This might show up two times.
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15. Click the stamp icon and select the area, where graphical reprezentation of signature will be located.
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17. Click "Sign" to sign the document.
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19. Enter the OTP code (SMS token). This might show up two times.
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21. After that, your document should be signed. On SIGNIUS Professional platform the amount of qulalified signatures will be reduced by the number of signed documents.
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23. Select the file and click "Show document" to display the signed file.
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25. You are able to download or print the signed document by clicking icons in the upper right corner.
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