Pixillion, an image conversion tool that will convert images to other formats, is available. You can convert your images into any format you like, including jpg, png and pdf.
Pixillion allows you to see the preview so that you can decide if it's the correct size.
Pixillion is a great option if you are looking to make a photo smaller. It doesn't have many features but they're simple and accurate. The program weighs just 128Kb.