Image Tuner is an easy-to-use image editor that supports most popular file types like TIF, GIF, JPG and PNG, as well as unprocessed RAW images. It comprises a few handy tweaks, such as resizing, watermarks, conversion and renaming.

The program is installed very quickly and without any issues. Its interface is simple to navigate, thanks to the familiar look. Image files can be added to the task list using either the file browser, folder view or drag-and-drop method.

As you may probably noticed by now, batch processing is supported, which means you can work with multiple files at once to reduce overall task duration.

As far as tweaks are concerned, you can resize the photos by percentage or size (preset or custom) and use filters (e.g. linear, BSpline, Lanczos3), apply an image watermark and set its opacity and position, as well as convert the pictures to other formats (JPEG, PNG, BMP, GIF or TIFF) and configure JPEG and PNG settings, if necessary.

The batch renaming tool is simple enough, as you can specify a naming pattern. Other effects provided by Image Tuner are able to reset EXIF and general information, flip and rotate the pictures, automatically sharpen them, as well as to adjust the hue, saturation, brightness and contrast levels.

Images can be previewed in a small, built-in frame, as well as enlarged by bringing up a secondary window. In addition, an ongoing project can be saved to file and resumed at a later, more convenient time. Settings can be restored to default.

Image Tuner has minimal impact on PC performance, since it uses low CPU and RAM. We have not come across any unpleasant surprises throughout our evaluation, since the tool did not hang, crash or pop up error messages.

Although it is not the most attractive image processing tool interface-wise, Image Tuner offers a simple solution to performing popular operations, such as resizing, conversion and renaming in batch mode. It can be handled by all types of users.