How Can I Reduce the Size of a Large Video Zip File?

As many have said, expect diminishing returns on compression here. MP4 videos will only reduce so much more. It sounds like you’ve done a good job already. If you’re okay with potentially lower quality, you can try some more advanced codecs which can sometimes get you down to around 20 GB with decent quality.

If you’re open to it, you might want to lower the video resolution or adjust the bit rate. Tools like Handbrake can be really helpful for transcoding your videos to a more efficient format. Just keep in mind that reducing quality is the trade-off to get smaller files.

Honestly, you won’t get much more compression out of the videos since they’re already in an MP4 format, which is pretty efficient. If you're looking to reduce the size further, you might consider changing the video codec to H.265 or AV1, but that will take some time and could result in a slight loss in quality.

You’ve already done pretty well by going from 150 GB down to 100 GB – that’s a significant reduction! For further size reduction, try compressing again with something like 7-Zip or using the xz format with max compression. Just know that the more you compress, the more you'll sacrifice quality – it's a trade-off.

You’ve already compressed them pretty well! If you really want to save space, look into using variable bit rate encoding. It might help squeeze out a bit more compression, but you need to be careful with how much quality you’re willing to sacrifice.