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For various reasons I want to scale down a couple of images so that they have a specific file size. I want to convert gif, tiff and jpeg files.

Is there any tool that allows me to do that with a batch?

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You can do this with GIMP or Photoshop quite easily, just Google batch resize with either program name. –  Breakthrough Jun 19 '12 at 19:07
    
I can find tutorials that show me how to batch process images to resize based on image resolution. But I can't find an explanation on how I can do that based on image file size. –  RoflcoptrException Jun 19 '12 at 19:37
    
You might take a look at ImageMagick for accomplishing this, it is a powerful tool with many features. –  jmreicha Jun 19 '12 at 20:52
    
How specific do you want the file size to be? Down to the byte? Kilobyte? You could probably do it with a script and ImageMagick - compress, check file-size, compress more or less depending on how much bigger or smaller than the target it is, repeat until close enough.. –  Blorgbeard Jun 19 '12 at 22:52
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2 Answers

In GIMP when you save a JPG, you can preview the output as you play with the compression level and it estimates the output file size. I believe this is the closest to what you're looking for. And I believe it only does this for JPGs.

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There is also IrfanView which is a free download that would allow you to batch resize. Download Here.

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