10+ best image compression software [2022 Guide]

RIOT stands for Radical Image Optimizer, and this is another free image compression tool. This tool is lightweight, but it offers advanced features, so it can be used by both basic and advanced users alike.

Regarding the file support, this tool allows you to optimize JPEG, GIF, and PNG images. The tool comes with two panes that will show you the original and optimized image.

RIOT comes with an in-place compare feature that will temporarily replace the original image in the preview pane with the compressed one so you can examine the changes in a single pane.

The tool allows you to change the image quality of JPEG images, but it also allows you to choose different encoding.

If you want, you can also perform image adjustments and change brightness, contrast, gamma, and other settings.

You can also rotate or flip your image if you need to. There’s a resample option available, and you can use it to resize the image using 6 different resampling filters.

During resampling, you can set the desired width or height in pixels or percents and choose to keep the aspect ratio if you want.

Regarding PNG images, you can change the color reduction profile or choose the number of colors manually. In addition, you can change the compression, color quantization, or use external optimizers.

As for GIF images, you can choose color reduction presets or reduce the number of colors manually. You can also add images to RIOT directly from the clipboard, which can be rather useful.

RIOT also comes with a useful option that lets you compress the image to the desired size in KB. There’s also support for batch optimization, so you can quickly edit and compress multiple images at the same time.

One thing that we don’t like about batch optimization is the lack of ability to set the desired quality. There’s also no preview window for batch optimization, which can be a problem for some users.

Despite those minor flaws, this is still one of the best image compression tools on our list.

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