Video Compressor Online — Reduce MP4 Size Locally
Compress video locally with selectable quality and resolution limits without uploading it.
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About this tool
The compressor creates an H.264 MP4 using one of three quality profiles. Balanced and high-quality modes cap height at 1080p, while the smaller-file mode caps height at 720p.
How to use
- Choose a supported video smaller than 200 MB.
- Select the output option, then start local processing.
- Preview and download the new video before closing the page.
Features
- Three compression profiles.
- Automatic 720p or 1080p height cap.
- H.264 and AAC MP4 output.
Common use cases
- Reduce a video before email or upload.
- Create a smaller preview copy.
- Lower the resolution of an oversized recording.
Common issues and tips
- A highly compressed source may not become smaller after another conversion.
- Smaller settings trade detail and audio bitrate for file size.
Privacy
The video is processed locally in your browser with FFmpeg WebAssembly and is not uploaded to Tools12345.
Frequently asked questions
Which setting creates the smallest file?
Smaller file uses stronger compression and a 720p height cap.
Will resolution ever increase?
No, the compression filter only limits height.
Can the result be larger?
Yes, especially when the source was already efficiently compressed.