How do I make the MB's smaller

i have photos 5-8 mb's 

want keep size of photo , reduce mb's can send them via email without loosing information in them.  

thank you, penni

where want loose image quality. can keep image same size , loose image quality encoding image using lower quality jpeg setting result in smaller size jpeg file.  or can resample image reduce number of pixels have image.  loose image detail, image size smaller jpeg file size..

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