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.

Refer http://stackoverflow.com/questions/11251340/convert-image-to-base64-string-in-ios — Paresh Navadiya, Aug 21 '14 at 06:24

score 56 · Answer 1 · edited Jun 13 '19 at 14:23

56

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];

edited Jun 13 '19 at 14:23

Cœur

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answered Oct 08 '10 at 10:12

Sagar

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http://svn.cocoasourcecode.com/MGTwitterEngine/MGTwitterEngineGlobalHeader.h -- However it should not be required and can be removed from header – Sagar May 09 '13 at 05:48
anyreason that why it takes some time to covert ?? – Mr.G Jul 27 '16 at 09:44

Abizern · Answer 2 · 2014-05-12T13:19:34.327

47

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];
}

edited May 12 '14 at 13:19

answered Oct 02 '13 at 15:58

Abizern

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4

Note that these methods have been introduced with iOS 7 but `base64Encoding` has been made available back to iOS 4. So unless you still support iOS 2 or 3 you can use `base64Encoding` or the one @Abizern mentions without any external frameworks. – Pascal Oct 26 '13 at 21:40
Thanks for mentioning the back port. – Abizern Oct 27 '13 at 09:05
2

I had better luck when passing options of `0` instead of `NSDataBase64Encoding64CharacterLineLength`. That way it does not insert any line breaks, and is usable in a `data:` URI in UIWebView. – TalkLittle Apr 01 '14 at 17:56
1

@TalkLittle try using `kNilOptions`. Same thing but more readable – Abizern Apr 01 '14 at 22:10
NSDataBase64EncodingEndLineWithLineFeed – Sound Blaster Jan 24 '19 at 21:57

Bhat · Answer 3 · 2016-09-29T08:10:14.113

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];
}

score 7 · Answer 4 · answered Oct 02 '13 at 15:17

7

@implementation UIImage (Extended)

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

@end

answered Oct 02 '13 at 15:17

Peter Lapisu

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Why don't use base64EncodedStringWithOptions directly? – Jiejing Zhang Apr 22 '14 at 14:52
So the code doesn't look like spagety :) a good habbit is to avoid 3 statements in each other like [Me doSmthh:[[Something execute:@"..."] someTypeOfValue]]; – Peter Lapisu Apr 24 '14 at 11:28

Fabio Napodano · Answer 5 · 2013-10-31T10:03:00.470

3

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

you should now use:

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

edited Oct 31 '13 at 10:03

answered Mar 04 '13 at 10:46

Fabio Napodano

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base64EncodingWithLineLength returns NSData – Peter Lapisu Oct 02 '13 at 15:18

score 2 · Answer 6 · answered Jan 22 '17 at 14:07

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()

score 0 · Answer 7 · 2016-08-24T08:55:25.957

when converting to image to base64 in ios the new line “\n” from base64 encoded strings :

use this code :


 UIImage* orginalImage = [info objectForKey:UIImagePickerControllerOriginalImage];



        NSIndexPath *indexPath = [NSIndexPath indexPathForRow:isRowIndex inSection:isSectionIndex] ;

        UITableViewCell *cell = [jobstable cellForRowAtIndexPath:indexPath];

        UIImageView *tableIMAGE=(UIImageView *)[cell.contentView viewWithTag:19];

        tableIMAGE.image=orginalImage;



imageStris = [UIImageJPEGRepresentation(tableIMAGE.image,1)base64Encoding];

answersARRAY[indexPath.row] = [NSString stringWithFormat:@"-1,%@,%@",answersARRAY[indexPath.row],imageStris];

[self dismissViewControllerAnimated:YES completion:nil];

UIImage to base64 String Encoding

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