Magiceraser.io requires no signup and is completely free to use for basic edits, but for some reason, it limits your ability to edit in high resolution unless you cough up $9.99 USD per month..

With MagicEraser.io, you can cut out anything you want, including people, faces, and objects. Use the automatic cleaning wand and adjust the intensity of the cleaning. Clean unwanted pixels with a manual cleaning wand. Changing the background color and zooming are both essential for the best image results!