Yes they can figure it out and if @TryNinja can figure it out he would definitely come up with this service as he is usually working on lot of tools to help forum members.

OP, there are image converter sites online, free tools. You can convert webp, svg or any other format to png, jpeg etc. Use them.
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Only if we are trying to upload image in any format that's not supported by the image hosting sites as usually we have them in .jpg or .png format as I have no problem in image uploading ever but yes there are many services through which you can easily convert the format without even compressing the file.