: Need png optimisation/compression advice I have a large set of png images I am trying to compress and I would like some advice from all of the graphics experts out there :) on the best method

@Steve758

I use pictureslash.com its awesome, with many features :) - and free

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@Angela777

For Mac I've created ImageOptim which runs all PNG optimization tools on every file and picks the best result.

It includes PNGOUT and all tools that YSmushit and PNGSLIM use, so with single drag'n'drop you have equivalent of applying all the advice of all other answers here :)



If you could sacrifice a little quality, then you could reduce size of PNG images by 60%-70% with lossy PNG compressor ImageAlpha (TinyPNG is equivalent tool you can use on Windows).

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@Smith574

More tools:


PNGOut
Yahoo SmushIt (online)


For me PNGOut seems to be the best, but in a few cases SmushIt produced lower sized images. OptiPNG produced larger files than both.

There's also Google Page Speed, which tells you which images could be optimized...

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@Ogunnowo857

Try these two, both of which are very good:

RIOT - luci.criosweb.ro/riot/
PNGGauntlet - pnggauntlet.com/

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@Jennifer810

The tool you mentioned seems to work great for me (no virus warning). I saw a 44% decrease in file size, after a single test.

You can download here: people.bath.ac.uk/ea2aced/tech/png/
It also looks like a newer version may be available, according to the modified dates. I downloaded and ran pngslim091.zip.

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@Holmes874

On the Mac I use PNGCrusher:
www.macupdate.com/app/mac/17768/pngcrusher
On Windows I use Optipng:
optipng.sourceforge.net/
Both basically strip out all meta information that isn't required by the browser to render it.

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