Compression is a trade-off
This tool re-encodes to MP4 with H.264 video and AAC audio. Supported browsers use native WebCodecs with low, medium or high bitrate presets and a hardware-encoding preference. The compatibility path uses CRF 28, 23 or 18 for the corresponding choices. Smaller resolution and stronger compression generally reduce size while losing detail. An already efficient source can produce a larger output; compare the actual sizes before keeping it.
A practical workflow
Select a video, choose a short range and output width, then compress. Play the output and inspect small text or fast movement. Original rotation and advanced HDR metadata are not guaranteed.
Before you export
Use only media you own or have permission to process. Keep the source and inspect the result. Desktop Chrome or Edge is a useful starting point; memory, codecs, and graphics support vary by device. A readable error means the current file or environment needs a different workflow, not that a result was created.
Why is the result not always smaller?
A very small source, a different codec, or short clip overhead can outweigh the chosen compression. Try a smaller width or stronger compression. The tool reports the actual size instead of promising a target.
Do my files leave this device?
No media is uploaded by these tools. Your browser downloads pages and models from the website host, and the media engine from jsDelivr. Hosting requests and contact inquiries are explained in the privacy policy.
Report a problem or suggest an improvement →
Read the current limits for this tool. Files are processed locally; ordinary website and dependency requests are explained in the privacy policy.