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     8 years ago  

    easiest way for one image is "MS Paint". There is a resize tool.
    If you are using advanced programs like Adobe Lightroom, there are export options which let you dictate the export rules(quality, size, format, colorspace etc).

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       8 years ago (edited) 

      In Windows I would highly suggest not using the standard MS Paint, and using Paint.NET instead. It's a really good balance of simplicity and standard bread-and-butter photo editing tools, and resizes images in high quality. It allows you to select your JPEG compression when you save an image and gives you a quality and filesize preview.

      But if you're using another high quality image editing program like Lightroom and Photoshop, by all means use those. I still will use Paint.NET for simple resizes and JPEG/PNG edits sometimes just because it's so lightweight and simple.

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       8 years ago  

      I love Paint.net for resizing and simple photo editing, but it's not very effective in lossless image compression. I recommend using online tools like:
      https://compressor.io/compress
      http://optimizilla.com/
      https://tinypng.com/

      (I wrote a guide about this for a client once, so I remember these by heart)

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         8 years ago  

        but you don't need lossless for JPG's you upload to sites like these + it takes time to upload them to the online compressor. (It's another matter if you intend to sell prints ofc... but then you are going to use the original file anyway).
        But thanks for the links :) It's definitely useful for users who don't have any image processing software at hand.

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