pdfinverter VS browser

Golang's image package is fairly easy to use. Here is an example.

I still say QT is one of the best out there for Go imo... you will have to do some googling as the docs are lengthy as hell without many good comments. But you can do anything that QT does in any other language. Many times I had to lookup Python or C++ examples and figure it out from there. It always works though. Here's some silly examples: ex1 ex2 The only thing that I don't like about it, is that the first time you build your project a separate binary will be created in your directory for your Golang to work with. I haven't figured out any way around that... so if you package your app, you will have your Golang binary plus a separate qtbox one as well.

I had messed around with QT for go for a while and I actually like it. However I did not use qml though. Maybe you can poke around and get some ideas.

You will end up with a single binary that works across all operating systems. Your Go program uses a web server internally to communicate with your web app and to serve static files. To make it really easy for your users use something like https://github.com/pkg/browser to start the default browser with the correct URL when the program starts. It even works offline because all required files come with the go executable.