Using XnConvert to bulk convert image sizes

XnConvert is a user-friendly tool that works on Windows, macOS, and Linux.

• Install XnConvert :

  • Download it from XnConvert's website.

• Batch Processing :

  1. Open XnConvert.

  2. Add your portrait images by dragging and dropping or using the `Add files` button.

  3. Go to the `Actions` tab.

  4. Click `Add Action` and select `Image > Resize`.

  5. Set the desired dimensions (e.g., 800 x 600 pixels) and check the box to maintain the aspect ratio.

  6. Click `Add Action` again and choose `Image > Canvas`.

  7. Set the canvas size to match your desired dimensions and choose a background color (white, black, etc.).

  8. Select the output format under the `Output` tab and choose the output folder.

  9. Click `Convert` to start the process.