XnView is a software to view and convert graphic files, really simple to use. XnView is provided as freeware for private non-commercial or educational use (including non-profit organization). Here is the instruction to tell you how to use it.
1. Download XnView from here:
2. Here are the basic toolbar instruction:
Browser - for organizing and renaming your images.
Open – open your images for digital changes.
Search – Search for a file by its name, size, location, and a sundry of others.
Scan – If you have a scanner or a digital camera you can ‘acquire’ the pictures with this button.
Convert – you can batch convert files
Capture – Do a screen capture for whatever you might need screenshots for.
Quick slide show – Create a quick slide show with a collection of pictures or images.
Options – Make any changes in XnView that you need to do