These are not for cinephiles. They are for story consumption on the go.

You will rarely find true 1080p or 4K video at this size. Instead, these files typically utilize resolutions like 480p (Standard Definition) or custom mobile resolutions like 640x360 pixels. On smaller smartphone screens, these resolutions still look remarkably sharp. Bitrate Reduction

The are not about visual fidelity; they are about accessibility. They are the files that load in 10 seconds on a train station Wi-Fi, the ones that fit 200 movies onto a microSD card the size of a fingernail, and the ones that keep you entertained when the power is out and your battery is at 15%.

For those comfortable with the command line, FFmpeg is extremely powerful. The following one-liner is a strong starting point:

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If a movie file ends in .exe , it is malware. A compressed movie should always end in .mp4 , .mkv , or .3gp .

This is your best bet. The H.265 codec is roughly 50% more efficient than the old standard.