UIImage to base64 String Encoding

Question

How to convert UIimage to base64 encoded string? I couldn't find any examples or codes with detailed regarding.

Answer 1

I wonder why didn't you find your question because it's a very old question & can be found here.

Anyways, You need to first add NSData categories to your project which are available from here -

header and implementation Then convert your UIImage object into NSData the following way:

NSData *imageData = UIImageJPEGRepresentation(image, 1.0);

And then apply Base64 encoding to convert it into a base64 encoded string:

NSString *encodedString = [imageData base64Encoding];

Answer 2

There are changes in iOS 7 that allow this to be done without using any external categories to support Base64 encoding/decoding.

You could just write it directly using:

- (NSString *)base64String {
    return [UIImagePNGRepresentation(self) base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
}

Answer 3

You can follow below code

-(NSString *)imageToNSString:(UIImage *)image
{
NSData *imageData = UIImagePNGRepresentation(image);
    return [imageData base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
}

-(UIImage *)stringToUIImage:(NSString *)string
{
 NSData *data = [[NSData alloc]initWithBase64EncodedString:string
                                                     options:NSDataBase64DecodingIgnoreUnknownCharacters];
    return [UIImage imageWithData:data];
}

Answer 4

@implementation UIImage (Extended)

- (NSString *)base64String {
    NSData * data = [UIImagePNGRepresentation(self) base64EncodedDataWithOptions:NSDataBase64Encoding64CharacterLineLength];
    return [NSString stringWithUTF8String:[data bytes]];
}

@end

Answer 5

NSData (Base64) has changed slightly since the last reply in this thread.

you should now use:

NSData *base64EncodedImage = [UIImageJPEGRepresentation(img, 0.8) base64EncodingWithLineLength:0];

Answer 6

Swift 3

I use base64EncodedString() to convert Data() object to base64 string

To convert image to base64 string

    var sample = UIImage(named: "image_logo")
    let imageData:Data =  UIImagePNGRepresentation(sample!)!
    let base64String = imageData.base64EncodedString()