How to Batch Resize a Set of Photos

Posted: November 16, 2014 by Craig Daniels

In this post, we will take a look at the difference between the high resolution photos that we take with our cameras as compared to the optimized copy that we should be using when we are working with web presentations.

Having high resolution images is great for certain types of presentations such as when we need to PRINT a high DPI photo. However websites do not need all those pixels. Most of the time, photos on a web page are 1000 pixels or less in width. So if you have a 10 Megapixel (MP) photo from your camera and you upload it straight to the web, there are thousands of pixels being uploaded that will simply be not used. Transferring large files takes significantly longer time. If you are uploading many files for your real estate listing, each upload takes longer and then multiply that time by the entire set of photos.

In the chart below, this file size comparison is illustrated. The longer bar represents the file size of a 10 MP photo (16MB) compared to a 1000 pixel photo (179KB)


With the above in mind then, it is worthwhile for us to spend a little time in making a copy of our high resolution images with a lower resolution. In the tutorial video below, I demonstrate how to do this. The tutorial is using Microsoft Windows and a free image editor app called Irfanview. We will take a look at how to batch process a whole folder of photo files into a separate folder with smaller file sizes.

Note: Irfanview is a windows app. If you are on a Mac, the concept is the same, but you just have to use a different app. On a Mac, there is the built in ‘Preview’ app that allows you to batch process to resize a group of photos. You can view this tutorial video if you would like to know how to do batch photo resizing on a Mac.

If you are using Microsoft Windows, here is my 12 minute tutorial video on how to do it.
(note: best viewed in full screen, you will see the full screen button at the bottom right corner
of the video once you start playing it)



About the

is a Technology Manager residing in NYC who specializes in applied technologies in the fields of Architecture and Real Estate. Craig focuses on finding the best uses of tech as can be used to help a business be more successful. He is keen on always seeing the perspective and viewpoint of his audience and he tailors his teaching to be easily understood. He teaches by means of this blog and his pre-recorded video classes. It is very easy to become a patron of Craig's Classroom training and it means a lot! [Find out how you can become a Two in Two Patron...]