Online Convert - Convert files like images, video, documents, audio and more to other formats with this free and fast online converter.
PhotoPenguin App - PhotoPenguin is a completely free batch photo editor with support for cropping, resizing, adding watermarks, and converting photos to other formats. It works on the user's device, using the capabilities of modern browsers.
Wide Angle PDF Converter - Convert PDF documents to Word, PowerPoint, Excel, JPG and other formats!
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
CometDocs - Free online conversion service. Possible to determine unknown file format too.
Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats