Forum Discussion
gjvdkamp
Mar 01, 2026Copper Contributor
Side load office add-in?
I've created an office.js add-in that I can test with debugging in VS Code. I have deployed it including the manifest to a web site, but now I can't find the option to add it to my Excel anymore, wh...
Olufemi7
Mar 03, 2026Iron Contributor
Hello gjvdkamp,
You can sideload your Office.js add‑in in Excel 365 by going to Insert → Add‑ins → Get Add‑ins → My Add‑ins, then choose Upload My Add‑in or Add a Custom Add‑in → Add from File and select your manifest. If you don’t see it click Manage My Add‑ins at the bottom of the dialog. For a shared folder you can add the folder under File → Options → Trust Center → Trust Center Settings → Trusted Add‑in Catalogs, restart Excel and then pick it from My Add‑ins → Shared Folder. This is the supported way to add your manifest for testing and development. Support docs: https support microsoft com en‑us office view manage and install add‑ins for Excel PowerPoint and Word 16278816‑1948‑4028‑91e5‑76dca5380f8d