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Compress Video
Compress Video Online — Free Video Compressor
Shrink video files with presets optimized for WhatsApp, Email, or Web sharing.
Nothing is enforced, but the whole file is read into one buffer to decode its audio to 32-bit float, and the compressed MP4 is built up in another beside it — so clips much past ~100 MB risk exhausting the tab.
About Compress Video
Video files too large to share via email, messaging apps, or social media? Raw recordings and high-quality video files can easily be hundreds of megabytes or even gigabytes, far exceeding the limits of most sharing platforms. This tool offers smart compression presets optimized for common use cases: WhatsApp (720p resolution at approximately 1 Mbps, fitting within WhatsApp's file size limits), Email (480p at approximately 500 kbps, small enough for most email attachment limits), and Web (up to 1080p at approximately 2 Mbps, ideal for uploading to websites or cloud storage). The tool re-encodes your video to the H.264 codec using the browser's native WebCodecs API with mp4-muxer — hardware-accelerated where available, providing excellent visual quality at dramatically reduced file sizes. The compression typically reduces file size by 50-90% depending on the preset and source material. Everything runs in your browser — no video files are uploaded to any server, ensuring complete privacy for personal videos, confidential meeting recordings, and proprietary product demos. Supports MP4, WebM, and MOV input formats (in-browser encoding requires Chrome or Edge).
Questions
Which preset should I choose?
WhatsApp: optimized for mobile sharing (720p, ~1 Mbps). Email: small enough for email attachments (480p, ~500 kbps). Web: balanced quality for websites and social media (original resolution, higher bitrate).
How much smaller will my video get?
Results vary by content. Typical reductions: WhatsApp preset 60-80% smaller, Email preset 70-90% smaller, Web preset 30-60% smaller than the original.
Is there a file size limit?
No limit is enforced, but everything runs in your browser tab, so files much beyond ~100 MB risk exhausting its memory. Trimming the clip first is usually the better route for very long recordings.
Can the output end up bigger than my original?
It shouldn't — the preset bitrate is a ceiling, not a fixed target, and the encoder aims for at most 90% of what your source actually spends per second (with a 200 kbps floor so tiny clips aren't re-encoded into mush). If an encode still lands at or above the original size, the tool reports 0% saved and suggests keeping the original file.
Is the audio compressed too?
Yes — the audio is re-encoded to AAC at a bitrate matched to the preset: 96 kbps for WhatsApp, 64 kbps for Email, and 128 kbps for Web. A silent clip compresses fine; the output just carries no audio track.
Is my file uploaded to a server?
No. Transmute processes everything locally in your browser using JavaScript and WebAssembly. Your files never leave your device — there is no server, no upload, no cloud processing.