Painless Image Resizer is an easy to use tool that can (batch) resize all images in a folder with a single mouse click. Just choose the pictures you want to resize, the new size and press "Resize" button. ainless Image Resizer uses a very complex algorithm that loses almost no quality while resizing. It is the only image resizer on the market offers 7 resampling filters. This allows you to increase or decrease the image size, virtually without losing quality.