How can I crop and export a video to be 480x480 in Premiere?
Downscaling video

By scaling down a video, you are essentially compressing an amount of pixels to a less amount, which per definition means quality loss. While modern techniques and algorithms are not bad at their job, scaling videos, especially to odd multiples, can give odd results. But if you are really sure that this is what you want, here's how you can do it in Premiere Pro:

Setting up the sequence

In Premiere, you first create a new sequence of the desired resolution for your video. In the New Sequence pop-up, under the Settings tab, select Editing Mode: Custom. Now fill in the Frame Size to 480 horizontal and 480 vertical. Fill in other values in the screen as desired and appropiate for the project.



Resizing the video

Add your video to the just created sequence. Now we need to calculate the values at which we are going to scale the video:

480 / 774 ≈ .62 as vertical scale value
480 / 632 ≈ .76 as horizontal scale value


So then we simply fill in these values in the Effect Controls of the video. (Make sure the Uniform Scale option is not selected, otherwise you wont be able to set a different value for the width.)



And thats it! You can now export the sequence, Premiere Pro will automaticly take over the sequence settings.