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I recently discovered something that I previous thought was impossible: PNG-8 files can store Alpha Transparency in the same way as PNG-32 files can. Not Indexed Transparency (like GIFs), but full on Alpha Transparency.

(You can learn more about this here: http://blogs.sitepoint.com/png8-the-clear-winner)

Apparently it's possible to do this using Fireworks, but I can't find a way to do it using Photoshop.

Does anyone know a way of enabling this incredible feature in Photoshop? Through add-ons or by any other means? It's so incredibly useful for web developers that I can't believe it's not been included in the latest version (or any version) of PS!

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Photoshop and PNG-8 hate each other. Just thought you should know. –  Ignacio Vazquez-Abrams May 17 '11 at 21:00
@Ignacio: lol :) –  Mehrdad May 21 '11 at 7:41

4 Answers 4

You can use Ethan Gardner's pngquant script to convert a photoshop file to alpha-tx PNG. It works on Mac and PC. http://www.ethangardner.com/articles/alpha-transparency-in-png-8-images-without-using-fireworks/

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This may be the best option available today. Such a shame, but thanks. –  Django Reinhardt Oct 3 '11 at 0:31

This is an important subject, especially for web design. A big png24 image can be ~1mb, almost impossible to consider for web site design use. But same image as png8 with alpha is ~250kb, ok in a lot of situations.

And finally a drag-and-drop solution for png8 with alpha transparency, free as of 2013 04: http://tinypng.org/

And some more related tools are here: http://pngquant.org/


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Not that I know of, but save the image as PNG-24 then use this:


(I tried http://www.8bitalpha.com and http://tinypng.org but they gave me poor results.)

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Seems a lot slower than 8bitalpha and tinypng, but good for control, thanks. –  Django Reinhardt Oct 3 '13 at 16:42

go to file > save for web and device

look at right side there is a drop down after Preset you'll find there PNG 8 there are some option related to transparency,just check them out.

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Yes. Those options are for indexed transparency. My question was about alpha transparency. –  Django Reinhardt May 23 '11 at 0:09

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