Free Online Video Compressor
Our Video Compressor tool reduces video file sizes by re-encoding them at a lower resolution directly in your web browser. This is useful for shrinking videos before sharing via email, messaging apps, or social media platforms that have file size limits. The entire process runs locally on your device, so your videos are never uploaded to any external server.
How It Works
The tool uses the browser's native MediaRecorder API combined with the Canvas API to re-encode your video. When you select a quality level, the video is played internally through a hidden video element, drawn frame-by-frame onto a canvas at the target resolution, and then captured by MediaRecorder into a WebM file. The audio track is captured separately and merged into the final output.
Quality Options
Three output resolutions are available. Low quality (360p) produces the smallest files and is suitable for previews or mobile viewing on small screens. Medium quality (480p) provides a good balance between file size and visual clarity for most general purposes. High quality (720p) retains more detail and is ideal when you need reasonable quality but want to reduce the size of a Full HD or 4K source video.
Limitations to Be Aware Of
Browser-based video compression has important limitations compared to dedicated desktop software. Processing speed is tied to the video's real-time duration since the browser plays and recaptures the video. The output format is limited to WebM, which may not be compatible with all video players. Compression ratios may vary depending on the source material and your browser's MediaRecorder implementation. For professional-grade compression with precise control over bitrate, codec, and format, tools like HandBrake or FFmpeg are recommended.
Supported Input Formats
The tool accepts any video format that your browser can play, which typically includes MP4 (H.264), WebM (VP8/VP9), and sometimes MOV and AVI depending on your operating system and browser. If a video fails to load, try converting it to MP4 first using another tool.
Privacy and Security
Your video files never leave your computer. All encoding and compression happens locally in your browser's memory. No data is transmitted to any server, making this tool safe for personal, confidential, or proprietary video content. Once you close or refresh the page, all temporary data is cleared from memory.