Compress Video
Reduce video file size for web, email, and social media sharing. Choose your quality level and download a compressed H.264 MP4 — all in your browser.
How to compress Video
- Drop or select a video file (MP4, WebM, MOV, AVI, MKV).
- Choose a quality level: High, Medium, or Low.
- Click Compress Video and wait for processing to complete.
- Download the compressed MP4.
Private by design — all processing happens in your browser. Your images are never uploaded to a server.
Related tools
Frequently asked questions
How much smaller will my video get?
It depends on the source codec and quality setting. Medium quality typically reduces file size by 30–60% with minimal visible quality loss. Low quality can reduce size by 70–80%.
What format does the compressed video use?
The output is always H.264 MP4, which is the most widely compatible video format for web, email, phones, and social media.
Why does compression take a long time?
Video re-encoding is computationally intensive. Unlike stream-copy operations, H.264 compression must analyze and re-encode every frame. Large files (500MB+) can take 5–15 minutes depending on your device.
Is my video uploaded to a server?
No. All processing happens locally in your browser using ffmpeg.wasm (WebAssembly). Your video files never leave your device.
What is H.265 or HEVC — can you compress to that?
H.265 (HEVC) produces smaller files than H.264 at the same quality, but it is not available in the browser-based version of ffmpeg due to patent restrictions. H.264 MP4 is the best available option here.