Is there a freeware or commercial WYSIWYG editor that supports pasting of images like this awesome tool? I have a use-case where users are creating charts in E

Is there a freeware or commercial WYSIWYG editor that supports pasting of images like this awesome tool? I have a use-case where users are creating charts in Excel and want to paste them into a HTML textarea and WYSIWYG editor that supported paste of images from the clipboard would be awesome. Thanks