ImageShell Resizer is a free, simple yet powerful, bulk image editing tool.
It takes all the files you have placed into one folder, and creates a new folder with all the files changed as per your requirements.
As the name indicates, it can resize your images (expand or shrink), as well as rotate, crop and convert their format. If you are resizing, you can specify a percentage increase/decrease as well as a fixed size specified in pixels.
ImageShell Resizer handles a large number of file formats as input and output, including all the major ones (JPG, PNG, PDF, GIF, BMP, TIFF) as well as a large selection of less common formats. In total 50 file formats are handled.
Help is available in the form of documentation and videos on our website.