: For advanced users, tools like yt-dlp allow you to specify the "worst" quality to ensure the smallest file. Command : yt-dlp -f worst [URL]
If your goal is to save data or storage by downloading the absolute smallest MP4 version, you can use the following methods:
: Lowering the bitrate (the amount of data processed per second) reduces file size but also decreases visual clarity.
: The Video Downloader Professional extension for Chrome can detect available streams on a page and list them by file size, letting you pick the smallest one directly. Key Factors for Small File Sizes
: MP4 files using the H.264 codec are the most compatible, while H.265 (HEVC) can offer even smaller files at the same quality level, though it may not play on all older devices.