Some folks have had issues finding our PCB builder. Here’s the path you want to follow to get there: From the Digi-Key homepage (and most pages on the Digi-Key site), move your mouse cursor over the “Resources” tab on the banner to make a drop-down menu appear, and in that menu click on “Engineering Resources.”
From the Engineering Resources page, click on “Design Tools” on the banner above the “Featured Content” section, where you will see the PCB Builder listed with other tools and programs for design help.
If you have any trouble, here is the direct link: https://www.digikey.com/en/pcb-builder/
Something to keep in mind is that the PCB Builder assumes you have a gerber file ready to upload with your layout complete. It is not a stand-in for a CAD program.