All the ones I've tried in the past have started requiring subscriptions to use or use without watermarks.

Victoria Rose | Bi trans girl | Game/UX Designer | Creator of Secret Little Haven | Your local otherkin cartoon snep kitty :3
All the ones I've tried in the past have started requiring subscriptions to use or use without watermarks.
It's TOTAL overkill, but you can import gifs into Krita.
I realized that ezgif.com will let you upload an existing gif + another image into its gif maker and there's a checkbox for "use first frame as background" so I updated my other post