XnResize is a freeware batch image processing tool, made by the developer of XnView. You can use it to resize, rotate or convert several images in just matter of seconds.
The program has a dark theme, the interface is uncluttered and easy to use, It has four tabs at the top. Add the pictures for conversion, using the Select Photos tab. You may drag and drop files onto the interface or use the "Add Files" or "Add Folders" buttons in the bottom left corner.
XnResize displays a thumbnail of each photo that you've added, along with the filename, resolution (in pixels) and file size (in Kilobytes). Use the four icons above the preview pane to change the size of the thumbnails. Sort the order of the pictures by clicking on Name, Size, Modified Date, Created Date, EXIF Date Taken, Properties or Print Size. The buttons toward the bottom right allow you to remove a selected photo or all of them, in case you want to start over.
Click on the Next button or the Action tab to proceed. Here you can choose the resize options. There are a few presets (resolution sizes) available for quick selection. However you can manually define the width and height in terms of pixels, percentage, inches, cm and mm. The Mode setting determines the resizing method, you can pick from the following options: Fit, Fill, Longest Side, Shortest Side, Megapixels, Width and Height.
Keep the "maintain ratio" option enabled, else your picture will be stretched oddly. For e.g. the pictures that I used for conversion were press renders which were in QHD and UHD resolution (3000 x 2804, 4000 x 5997 pixels). I wanted to convert them to a usable size, so I set the maximum width and height to 1024 x 800 pixels. XnResize converted the images to 534 x 800, 856 x 800 pixels by maintaining their ratio.
XnResize has the following resampling methods: Bilinear, Hermite, Gaussian, Bell, Bspline, Mitchell, Lanczos,and Hanning. Optionally, you can set the rotation setting for the pictures (90° Clockwise, 90° Counter Clockwise, or 180°).
Switch to the Output tab to set the Output folder. XnResize can batch rename the files. You may choose to retain the original Filename, or Filename_result or Filename_DstWidthXDstHeight.
The program allows you to change the case of the filenames, and options for these include No change, Name and extension lower case, Name and extension upper case, Name lower case, Name upper case, Extension lower case, Extension upper case, First letters uppercase.
Use the format section to convert the images into a different format. XnResize supports 500 image formats including the following: BMP, GIF, PNG, JPG, CIN, CSV, DCX, DDS, DIS, DPX, EMF, FLIF, FTS, GBR, GRO, HDR, HEIC, HRU,ICO, IFF, IMG, JIF, JP2, JXR, KRO, MBM, MIF, MTV, NGG, NLM, NOL, OTB, PAT, PBM, PCL, PCX, PDB, PDF, PGM, PI1, PIC, PIX, PNM, PPM, RPC, PS, PSD, QRT, RAD, RAW, RAWRAW, RGB, RLA, SCT, TGA, TIF, VST, WBMP, WEBP, WRL, XBM, YUV.
Adjust the image quality, subsampling, and other options from the format settings. XnResize allows you to retain the original filename, folder structure, date/time, metadata and color profile in the output settings. When you're ready, hit the convert button to process the images. The program will switch to the Status tab, which displays a log of the process.
XnResize is available in an optional portable version. According to a message on the developer's portal, a version for Mac and Linux will be available soon.
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