How to Compress Videos for Easier Sharing
Video files are the largest everyday file type most people deal with, and compressing them well is what separates a clip that uploads and plays smoothly from one that stalls out or gets silently size-limited by whatever platform you're sending it through.
Bitrate matters more than resolution
It's tempting to assume shrinking resolution (say, from 1080p to 720p) is the main lever for file size, but bitrate — how much data is used per second of video — usually has a bigger direct effect. A 1080p video at a well-chosen lower bitrate can be smaller and look better than the same video downscaled to 720p at a high bitrate, since resolution and bitrate are solving different problems: resolution is how much detail is in each frame, bitrate is how much data is spent encoding that detail over time.
What a good compression tool is actually doing
Video compression works by re-encoding the file — finding redundancy between frames (a mostly-static background across many frames needs far less new data than one that's constantly changing) and adjusting how much visual detail is preserved per frame. A good encoder does this intelligently, keeping quality highest where motion and detail are most noticeable and compressing more aggressively in less visually important areas. This is why two videos compressed to the same file size can look noticeably different in quality — the underlying encoding matters as much as the target size.
Picking a target based on where the video is going
A video for a messaging app or social media upload benefits from more aggressive compression, since those platforms usually re-compress it again on their end anyway and have their own size limits. A video meant to be archived or edited further later deserves a lighter compression setting, since starting from a heavily compressed source limits what you can still do with it in a later edit.
Trim before you compress
If a video has dead time at the start or end — a few seconds before recording actually begins, or after the important content ends — trimming that out first, before compressing, means you're not spending compression effort (and remaining file size) on footage that's getting deleted anyway.
Compress Video handles bitrate-based compression directly in your browser, with a live preview of estimated output size. If a lower resolution genuinely fits your use case, Resize Video can combine with compression for an even smaller file, and Trim Video is worth doing first if there's unneeded footage at either end.