For the purpose to make thumbnails, You could use a variety of programs. I suggest Irfanview, as it has the ability to, not only save in JPG, but to optimize the image to web-usage. It is an excellent tool, and it is free. Even if I have the Corel Paint, and Paint Shop Pro, I have used Irfanview for the images used on this site.
What is IrfanView?
IrfanView is a very fast, small, compact and innovative FREEWARE (for non-commercial use) graphic viewer for Windows 9x, ME, NT, 2000, XP, 2003 , 2008, Vista, Windows 7, Windows 8, Windows 10.
It is designed to be simple for beginners and powerful for professionals.
IrfanView seeks to create unique, new and interesting features, unlike some other graphic viewers, whose whole "creativity" is based on feature cloning, stealing of ideas and whole dialogs from ACDSee and/or IrfanView! (for example: XnView has been stealing/cloning features and whole dialogs from IrfanView, for 10+ years).
IrfanView was the first Windows graphic viewer WORLDWIDE with Multiple (animated) GIF support.
One of the first graphic viewers WORLDWIDE with Multipage TIF support.
The first graphic viewer WORLDWIDE with Multiple ICO support.
You can visit their site : http://www.irfanview.comSome IrfanView features:
- 32 and 64 bit version
- Many supported file formats
- Multi language support
- Thumbnail/preview option
- Paint option - to draw lines, circles, arrows, straighten image etc.
- Toolbar skins option
- Slideshow (save slideshow as EXE/SCR or burn it to CD)
- Show EXIF/IPTC/Comment text in Slideshow/Fullscreen etc.
- Support for Adobe Photoshop Filters
- Fast directory view (moving through directory)
- Batch conversion (with advanced image processing)
- Multipage TIF editing
- File search
- Email option
- Multimedia player
- Print option
- Support for embedded color profiles in JPG/TIF
- Change color depth
- Scan (batch scan) support
- Add overlay text/image (watermark)
- IPTC editing
- Effects (Sharpen, Blur, Adobe 8BF, Filter Factory, Filters Unlimited, etc.)
- Screen Capturing
- Extract icons from EXE/DLL/ICLs
- Lossless JPG rotation
- Shell Extension PlugIn
- Unicode support
- Many hotkeys
- Many command line options
- Many PlugIns
- Only one EXE-File, no DLLs, no Shareware messages like "I Agree" or "Evaluation expired"
- No registry changes without user action/permission!
- and much much more