Use IrfanView to Batch Resize Lots of Images at Once
IrfanView is first and foremost an image viewer, and it’s a great one. It’s fast, lightweight, and can open just about every image format in existence (even a lot of audio and video formats). And best of all, it’s free.
It doesn’t include a lot of the editing and annotation tools of an image editor like PicPick, but it is great for quickly resizing, cropping, and rotating images. And there are lots of plugins available that extend its functionality.
Resize a Single Image in IrfanView
To resize a single image in IrfanView, open the Image menu, and then click the “Resize/Resample” command.
You can resize by specific dimensions (pixels, centimeters, or inches) or by percentage. IrfanView uses dimensions by default, which is great for when you need images to be a specific size, though you can switch to percentages for rough resizing.When you type a width or height value, IrfanView automatically sets the other value for you to maintain the original image’s dimensions. You can disable this by deselecting the “Preserve aspect ratio (proportional)” check box.
Type in the new dimensions (or percentage) for the image, and then click the “OK” button.
That’s it. Your new image has been resized and is ready to use!
Resize a Batch of Images at Once in IrfanView
IrfanView has a built-in batch tool if you have multiple images that you need to convert all at once. The batch tool can be a little bit confusing to work with, since you can use it to apply just about any of the functions IrfanView includes. But once you get a hang of it and what options to use, it’s a great addition to an already excellent product.
Open the File menu, and then click the “Batch Conversion/Rename” command.
Next, in the right pane, navigate to the images you want to resize, select them, and then click the “Add” button. When you’ve got your images added, click the “Advanced” button over to the left.
The next window has a lot of features and is a little bit of an eye sore. The options we’ll need for resizing images are all over on the left, so we’ll just focus our attention there.
Select the “Resize” check box, and then enter the new size you want for all your images. The options here are the same as you’d find when resizing a single image. When you’ve got it set up then click the “OK” button to close the Advanced window.
Back in the main Batch Conversion window, make note of the output directory. That’s where your new, resized images are stored. If you want, you can select a different folder or just click the “Use Current (‘Look In’) Directory” button to have the new images save to the same folder as the originals. And don’t worry, your originals are retained by default.
Finally, click “Start Batch” to convert all your images.