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is there a way to convert all my jpgs to a smaller MB format like gif?
you can convert them to use a lower resolution or lower quality jpgs which is probably the fastest way to get them smaller.
if you want something more sophisticated you can convert them to JPEG 2000 which is a newer image format and is somewhat more efficient meaning better quality per file size. but not a lot of tools support it. and you'll always suffer some quality loss converting from one format to another like that.
don't convert your jpgs to gif, they'll look like crap. reduce resolution/quality if you want smaller jpgs.
you can try converting your jpgs to PNG, but I doubt you'd save very much space. The exception is if these jpgs are drawings, text, animation, or other block colors, where PNG is vastly more efficient.