Any Windows freeware that can trim an MP4, without bloat?

[mikebw]

You can just trim off the parts you don't want without recompression.

https://www.shutterencoder.com/en/ (available for Mac/PC.) Donationware.

Cut without re-encoding
Allows you to cut any video or audio file(s) by changing input and output point from the right panel.

If it's a video file with highly compressed codec (like H.264), the cut will be automatically on the nearest keyframe.