Image Compression and Resizing Tool

When I'm working on my niche sites, I often have the problem that I need to resize my images and compress them so I get the best performance.

For my use-case I needed 2 different tools + renaming them manually to get the image I want to upload onto my niche site.

I'm a programmer and hate tedious and repeating work, so I decided to make a tool for my workflow: https://www.canvar.io

Right now the functionality is very basic: You can upload an image, select an output format, resize and rename it. When you click on "Compress & Download", the image gets compressed and - surprise - downloaded to your computer.

Now I would love your feedback on the tool. What can I make better? What did I do good, what sucks?