how to make JPG image transparent background?

Question

As we all know that jpg image format does not support transparency. so we use .png format.

i was surfing on net and i found an image with .jpg format and transparent. it is wonder how a jpg format image can be transparent.

here is the example image. http://bdthemes.net/demo/joomla/intensy/images/sampledata/features/top_b.jpg

Answer 1

The provided example image is in fact not a JPEG, but a png file. It has the extension and mime-type of a jpeg file, but it's contents are in png format.

JPEG file format does not support transparacy.

So if you need transparancy in images for use in browsers. You can either:

• convert the image to png, this works in all browsers
• use ZorroSVG, requires SVG support but results in smaller files for photographic images.
• use webp, only use when you have fallbacks in place for browsers that do not support webp.

Answer 2

The new JPEG-XR standard supports transparency.

However, this is not a real JPG, it's a PNG. If you rename it to .txt, you can see that the contents of the file start with PNG:

Answer 3

check its mime type, it must be renamed .png to .jpg