Between Photopea (Photoshop like) and Olive (Premiere like) content creators have a lot of tools to get creative these days!
I highly recommend Olive if you are looking for free editing software!
You can easily make alerts if you use the WEBM codec! You may or may not need to install this codec: If you don’t see WEBM in the export options download here: https://www.fnordware.com/WebM/ Or Alternate Download Click Here!
To export a video with transparency effects, select Webm and click advanced, choose the codec yuva420p. The “a” in this codec stands for alpha which is our transparency effect!
Feel free to message me if you need help!