Video compressor that shows its plan first

How the target size is worked out

A video's size is roughly its bitrate multiplied by its length, plus the sound. So when you ask for “under 25 MB”, the assistant works out a bitrate that fits your clip's duration, and the plan shows the size that bitrate should produce. Treat it as an estimate: the finished file can land a little above or below it.

Resolution matters in a different way. At the same bitrate a 720p video is about as large as a 1080p one, but a low bitrate looks cleaner at the smaller size. That is why lowering the resolution often helps when the target is small.

When compression will not help

Many phone recordings and downloaded videos are already efficiently compressed. If the plan would not make the file meaningfully smaller, ToolGPT refuses and says why, rather than re-encoding for nothing. It can then suggest what will help, such as a lower resolution or trimming the clip first.

You can combine steps in one request. “Trim the first minute, then compress it for email” becomes a short workflow that you review once.

Where the work happens

Compression runs in your browser, using its built-in video encoder where possible and a WebAssembly build of FFmpeg where not. The time it takes depends on your device and the video's length. A progress bar shows how far along the job is, and you can cancel it.