This is a quickly-made image filter editor which I made so I don't have to use other websites to add filters.
Here is the UI
Example of me using 'inverting' tool on a smiley face
First load an image using 'File' button at the top then select a filter from the tab menu on the left. Fill out the options to what you want the click apply to see result. To save the result use 'File' and 'Save' buttons.