Objective-C Library Base64 Encode -NSDataAdditions.h -NSDataAdditions.m -NSStringAdditions.h -NSStringAdditions.m + usage NSData to base64 NSString NSData *data = [NSData dataWithContentsOfFile:fileName]; // load some data NSString* b64str = [NSString base64StringFromData:data length:[data length]]; base64 NSString to NSData NSData *decodeData = [NSData base64DataFromString:b64str]; from Any base64 library on iphone-sdk? (http://stackoverflow.com/questions/392464/any-base64-library-on-iphone-sdk)