Java - Convert Image to Base64

How to convert an Image to base64 string in java?

The problem is that you are returning the toString() of the call to Base64.encodeBase64(bytes) which returns a byte array. So what you get in the end is the default string representation of a byte array, which corresponds to the output you get.

Instead, you should do:

encodedfile = new String(Base64.encodeBase64(bytes), "UTF-8");

convert image to base64 with java

Using Apache IOUtils and Base64:

byte[] imageBytes = IOUtils.toByteArray(new URL("...")));
String base64 = Base64.getEncoder().encodeToString(imageBytes);

Converting javafx image to/from base64

Path path = Paths.get("...");
byte[] bytes = Files.readAllBytes(path);

And then

byte[] img = Base64.getDecoder().decode(bytes);

Or with better memory usage:

 InputStream in = Base64.getDecoder().wrap(Files.newInputStream(path));
 Image image = new Image(in);

One problem is that there are several Base64 classes historically, you need java.util.Base64.

Convert selected image into base64 string in Android (Java)

Please follow this to get actual image.

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) 
     {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == CAMERA_PIC_REQUEST && resultCode == RESULT_OK) {
           Bitmap photo = (Bitmap) data.getExtras().get("data");
           String imgString = toBase64(photo);
          }
     }

public String toBase64(Bitmap bm) {

    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    bm.compress(Bitmap.CompressFormat.JPEG, 100, baos); //bm is the bitmap object
    byte[] b = baos.toByteArray();

    return Base64.encodeToString(b, Base64.NO_WRAP);
}

Converting specific image to base64 string is incorrect

Looks like I was using Resttemplate to make the initial call to get the image URL in the response. I included the .pfx certificates in this resttemplate call. However, when I make the second call using new URL() I did not include the certificates and I was retrieving a failed html response that I encoded.

How to convert a image into Base64 string without compressing the image?

First of all using PNG compression will not lose image quality.

If you want to get the bytes without compression anyway, you can try the following:

ByteBuffer buffer = ByteBuffer.allocate(bitmap.getRowBytes() * bitmap.getHeight());
bitmap.copyPixelsToBuffer(buffer);
byte[] data = buffer.array();

To get Bitmap back from byte array:

Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.copyPixelsFromBuffer(ByteBuffer.wrap(data));
return bitmap;