Below is a batch WebP converter with a resizing function written in python.

It features:
Choosing a custom output folder or Outputting in the same folder as the original images
Option to delete original files after conversion
Option to resize images during conversion
Auto orientation retainment
Selecting the quality of the WebP image on a scale (1=worst, 100=best)
Ensure you have Pillow installed:
| Windows & macos | linux |
|---|---|
| pip install Pillow | sudo apt install python3-pillow |
Download the python file here
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