AVS Image Converter 

AVS Image Converter can change the original format of a batch of pictures. Moreover, it can be used to resize, rotate and apply effects to your images. The tool supports importing a wide array of picture formats. Besides, although the list of target extensions is definitely not as extensive, it allows exporting to the most widely used image formats as well as PDF.

Fortunately, the program comes with various dimension presets so you do not need to worry about remembering the exact measures of your favorite formats. Likewise, you can use customized sizes and even save them as new presets. Depending on the output format chosen, it is possible to make additional adjustments, such as quality and compression. The converter also lets you apply filters to achieve the desired effects. It can also automatically adjust contrast, temperature, brightness and other picture parameters. Moreover, you can easily stamp a watermark in the form of text or another image. Finally, the program lets you create a renaming pattern, which is quite useful when you are converting multiple pictures.

In my opinion, the best advantage of this tool is derived from the possibility to work with batches, which saves a lot of time and effort. What is more, the program can be controlled from the command line so you can create BAT files and even use Windows Task Scheduler to automate repetitive tasks. However, there is the limitation of not allowing individual conversion profiles.

All in all, there is no doubt AVS Image Converter is extremely helpful for those users who need to manage multiple pictures. The product advertises other software by the same vendor, which seems fair to me, as it is absolutely free to use.