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Take a look at this website

http://www.motobit.com/util/base64-decoder-encoder.asp

Is the content of your binary in characters alphanumeric?

/9j/4AAQSkZJRgABAQAAAQABAAD//gA8Q1JFQVRPUjogZ2QtanBlZyB2MS4wICh1c2luZyBJSkcg

SlBFRyB2NjIpLCBxdWFsaXR5ID0gMTAwCv/bAEMAAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEB

AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAf/bAEMBAQEBAQEBAQEBAQEBAQEB

OR is it a bunch of letters, and symbols?

ÿØÿà  JFIF          ÿþ <CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 100

ÿÛ C                                                                 ÿÛ C                                                                 ÿÀ    X   "       ÿÄ                            

ÿÄ µ                }        !1A  Qa "q 2‘¡ #B±Á RÑð$3br‚

     %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyzƒ„…†‡ˆ‰Š’“”•–—˜™š¢£¤¥¦§¨©ª²³´µ¶·¸¹ºÂÃÄÅÆÇÈÉÊÒÓÔÕÖרÙÚáâãäåæçèéêñòóôõö÷øùúÿÄ                 

The 1st one is base64.  The 2nd is binary.