10 Free Tools to Batch Convert and Resize your Images

With the size of the photo some digital cameras and smartphones can produce, it’s entirely possible for you to have images with a file size of several Megabytes each. Having files like this is great when you want to view them in high quality or print them out. When it comes to distributing them to others, uploading to online photo albums, or just storing them on your phone, keeping huge files is a waste of time and bandwidth.

Shrinking your images to a lower resolution or converting them to a more size efficient format before emailing or uploading is a sensible solution. It’s far easier to shrink a 10MB JPEG file down to 1MB and send or store that while only noticing a small drop in quality or not even seeing a difference at all.

We’ve previously listed 10 online services where you can upload and resize images from your web browser without installing any software but they are not meant for multiple images. Here are 10 free options to help you convert and resize multiple images locally on your own computer.

1. Microsoft PowerToys for Windows 10 / Image Resizer for Windows

Older users might remember PowerToys from the days of XP and Windows 95. In 2019, Microsoft resurrected PowerToys as an open source project for Windows 10. One of the returning features is the image resize tool which is based on Image Resizer for Windows from Brice Lambson. You can use either software on Windows 10 but Image Resizer is the only one that works on Windows 7 or 8.

Image resizer

Select the files to convert in Explorer and click on Resize Pictures from the context menu. A small window pops up with some preset sizes, a custom size option, and some checkboxes for overwriting and downsizing. When resizing, a value of 0 (or blank) will proportionally resize that dimension. For example, a width of 1600 and a height of 0 will make all images 1600 pixels wide and individually adjust their height to match.

Powertoys image resizer

In the Options window, you can add your own presets, adjust quality/compression, and make up your own naming scheme. Image Resizer has its own options window while PowerToys has the options in its main user interface. If you don’t want the extra tools in PowerToys, install Image Resizer. However, development has shifted solely to PowerToys and future updates will be for the PowerToys version only.

Download Microsoft PowerToys for Windows 10 | Download Image Resizer for Windows


2. FastStone Photo Resizer

FastStone’s tool is a powerful program for batch converting images. It also has a dedicated batch renaming function in case you don’t want to change the files but give them more orderly names. Photo Resizer includes its own file browser in addition to the standard drag and drop, and the amount of supported images is quite large with Photoshop PSD files and ICO icon files also included. There are seven output image formats, one of which is PDF.

Faststone photo resizer 1

The Advanced Options button (click the checkbox first) opens up another whole new area where there are a number of useful and advanced functions that can be applied to the images. These include; resize, rotate, crop, canvas size, color depth, brightness/contrast/gamma/sharpness adjustments, change DPI, add text, add a watermark, and border/framing/shadow effects. Check the Resize box to show the resize options.

Resizing can be by pixels, percentage, physical print size, or based on one side. There’s also some settings for cropping or filling if the image proportions differ from the original. Both setup installer and portable versions are available. The excellent FastStone Image Viewer also has a basic resize option and is worth looking at if you want to combine an image viewer and some simple conversion tools.

Download FastStone Photo Resizer


3. IrfanView

The well known and popular image viewer IrfanView boasts quite a powerful batch conversion function which is accessible by pressing B or from the File menu. There are three main modes; batch conversion, batch rename, or both in combination. As you might expect, it can load and save a large number of different file formats, and settings for Exif data, transparency, compression, and quality are accessed through the Options button.

Irfanview batch conversion

IrfanView has an Advanced checkbox and button that gives you the opportunity to make a large number of different adjustments to the images such as crop, resize, DPI, color depth, rotate, flip, overlay, watermark, and sharpen or blur functions to name just a few. The resize function itself has options for width, height, long side, short side, image size (in Megapixels), or a percentage. Various other resize options are in the lower left of the window.

The sheer amount of options might be slightly overwhelming for some, but the IrfanView batch conversion function has a great deal of power behind it. A portable version is also available and because it’s a great image viewer and has options for the command line as well, IrfanView is a useful program to have around.

Download IrfanView


4. XnResize, XnConvert, and NConvert

XnConvert is a free and comprehensive piece of image processing and conversion software. XnResize is essentially the batch image resizing part of XnConvert ported into a standalone program. As that is our goal here, we’ll look at XnResize but if you want more features, try XnConvert. XnResize and XnConvert are available for Windows (setup installer or portable version), Mac, and Linux.

Xnresize

One issue with XnResize is it doesn’t accept dropping folders onto the window. However, folders can be recursively added with the “Add folder” button. From the Action tab, you can choose the resize options from presets or enter dimensions manually and choose the mode of fit, fill, longest/shortest side, width, or height. The output window is where you select the save location, naming options, and save format. There’s dozens of different output image formats to choose from.

Download XnResizeDownload XnConvert

NConvert

This tool is also worth mentioning because it’s basically the command line version of XnConvert. If you want to resize, transform, filter, adjust, or add effects to images from the command line or a batch script, download and try NConvert.

Download nConvert


5. Batch Convert Images From A Webpage

This method is not actually what many users might think it is. You don’t upload anything to the internet as all the work is done within the browser using Javascript so the images never leave your computer. A number of websites can resize images using this method. They all work in a similar way and the only real differences are the options each one has. We’ll look at Bulk Resize Photos.

Bulk resize photos

Bulk Resize Photos is quite good because it offers a number of different ways to process the images. You can resize by percentage scale, file size, exact dimensions, width, height, or longest side. Simply drop the images onto the window or browse your computer, select the resize method and its options, then click Start Resizing. Single images will save normally but multiple images will be saved into a Zip archive.

The Expert Mode button gives options for saving as JPG, WebP, or PNG, and changing the quality level. Bulk Resize Photos also has some useful options like a URL where you can visit the site with the same settings applied each time and a Chrome App that acts like a standalone program.

Visit Bulk Resize Photos

Other webpage based image resizers we tested were Image Resizer Online, Birme, and RedKetchup Bulk Image Resizer. Do note that none of the online converters we list support folders or recursive processing, only image files are accepted for drag and drop or file browsing.

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