Some of the most common edits your images will have to go through are simple things such as resize, rename, format conversion, basic color fixes, etc. While you can’t be expected to sit through an album of 300 photos, manually resizing and renaming each one, many of the common image viewers don’t let you do these things by batch. Don’t waste your time, though, just download one of the free tools below, and start batch-editing!
IrfanView is an excellent image viewer and editor I’ve been using for years and years, and it just so happens that it includes a pretty nifty batch-editing tool. IrfanView’s batch editor can help you resize, rename, convert and adjust multiple images at once. The only downside? It’s not intuitive to find. Luckily, you have this post to refer to!
FastStone Capture is my go-to screenshot tool, and now that I’ve found FastStone Photo Resizer, I think I might have a go-to batch editor as well. Unlike Capture, Photo Resizer is completely free, and despite its name, does much more than resizing photos. Photo Resizer includes two main tabs: Batch Convert and Batch Rename. Unfortunately, you can’t use FastStone to do both at the same time (as least as far as I could see), which makes it just a tad cumbersome to use.
If you’re using Picasa as a photo viewer and uploader as it is, there’s nothing easier than doing some batch edits while you’re already there. There are several aspects you can edit in batches, and not all of them are done from the same place. 7 Free Apps to Batch Edit, Resize, & Rename Images