XnConvert is a cross-platform XnView batch image converter and resizer with a powerful and easy to use experience. It supports a wide range of input and output formats of graphic files, photos and images.
All common picture and graphics formats (i.e. JPG, PNG, TIFF, GIF, Camera RAW, JPEG2000, WebP, OpenEXR) as well as over 500 other image formats are supported.
This freeware application provides you with numerous image processing tools that can come in handy.
Also available within the batch operations include rotating, adding of watermarks, adding of text along with many image-adjustment features such as brightness, shadows and more.
XnConvert has been created by XnView developers. It is free for Windows, Mac, and Linux. Both 32-bit and 64-bit editions are available.