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Anonymous
You can use Irfanview.
1) go in menu File, Batch conversion (or press "B") 2) select the images (Add / Add all), choose the output directory and the output format (use "options" to set the jpeg quality and other details) 3) check "use advanced options", click con "set advanced options" 4) in the advanced options panel, check "resize", choose the new size, check "preserve aspect ratio" and "use resample function" 5) of course, you can use some other options if you want (I usually use the sharpen filter with value 15, when I reduce the size of the images) 6) start the conversion
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