Ever need to resize whole folders of images? Here's the directions and you can do it in a few clicks once you have it set up.
First download and install Irfanview, this is nifty little image utility which does a lot of things like batch resizing.
Once you have it installed open it, click File >> Batch Conversion Rename which will open a dialog box.
Under Batch/Conversion Settings select "Batch Conversion - Rename Result files"
Below that select the output format, generally speaking you're going to use .jpg.
If it isn't already checked put a check next to "Use Advanced Options" and then click the advanced button which will bring up a dialog box for resizing options.
If it isn't already there put a check next to "Resize" and below that select "Set new size"
Below that select "set long side too", make sure pixels is selected over to the right of that and set a size in the text box.
Below that make sure "preserve aspect ratio" is checked.
The same profile will be loaded the next time you open Irfanview and if you only need these options click OK. You can save the profile if you have a need for multiple options when resizing.
Under batch rename settings put "XXXX_$N". XXX_ can be anything you want, for example "resized_". $N is a variable that holds the original filename so if your original image is myoriginal.jpg the re-sized version will be given name like "resized_myoriginal.jpg". which will allow for easy sorting if they are in the same directory as the original.
Up on the top next to look in browse to the folder where the images reside. Once you have the folder selected click the "Add All" button.
On the left under output directory click "look in folder" which will ouput your images to the same directory the originals are in. Note that we aren't overwriting the originals because we have prefixed the filenames with "resize_" and by default Irfanview will not overwrite files unless you force it too anyway. The other option here is if you wanted to output them to their own directory, for example after clicking the "look in folder" button add resized on the end of the output directory.
Click start Batch and that's it.