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When I forward emails with JPEG attachments inline, the JPEG files size enlarge. Is this normal? Can I turn it off?

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When I forward emails with JPEG attachments inline, the JPEG files size enlarge. Is this normal?

Yes. E-mail standards require that emails consists only of text; JPEG files are binary data. The inline images must first be converted into text, which increases their size. These are converted back into binary JPEG data at the recipient's end.

Can I turn it off?

No.


The Base64 Wikipedia article has more technical information and examples if you are interested in one of the most common ways this conversion takes place -- this one increases sizes by approximately 33%.

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So this will be true for any email client? Funny how I've never noticed it before. Thanks for the answer. –  Henri May 18 '12 at 7:39
    
Yes, any email client and almost any attachment: zip, jpg, etc, unless you are attaching a plain text .txt file :) –  izx May 18 '12 at 7:48

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