Outlook: Ultimate insert images into signature that you can safely send

Outlook has a tendency to either not send embedded images with signatures, or it sends links to images (like in OWA) The solution is to convert the image to Base64 string, and use it like that

Embedding base64 image string into html
<img alt="Embedded Image" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADIA..." />

Now, You can either use an online converter such as this one, or you can start coding yourself:

c# converter
// convert from bitmap to byte array
public byte[] getBytesFromBitmap(Bitmap bitmap) {
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    bitmap.compress(CompressFormat.JPEG, 70, stream);
    return stream.toByteArray();
// get the base 64 string
String imgString = Base64.encodeToString(getBytesFromBitmap(someImg), Base64.NO_WRAP);

The imgString value is what you want to send Other examples:

div.image {
  <title>An Image</title>
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  • software/outlook/signature_pictures.txt
  • Last modified: 2019-10-31 09:05
  • (external edit)