In this article you can read how you can download a certified transcript of results. This is only available for students of a bachelor or master program
When you are logged in, click on the title Transcript

You will now land on the tab My Transcripts under the tab My Academics. Here you can download a certified transcript for the program of you choosing by clicking on the button Transcript. If you would like a Dutch Transcript, you can click on the button Cijferlijst.

The transcript will open in a new browser tab. You can recognize that the document is certified by the text "Universiteit Leiden" in the upper right corner. Don't forget to download and save the document.

If you want to validate the certification, you will need to open the document in Adobe Acrobat Reader. Here you can validate it with the signature validation tool.