GIF to MP4 Converter Online

The GIF format was created in 1987 and is incredibly inefficient. A high-quality animated GIF can easily exceed 15MB, which will completely ruin your website's Google Lighthouse performance score. This transcoder is built to convert heavy GIFs into lightweight MP4s, often reducing the file size by over 90%.

FFmpeg via WebAssembly

Video transcoding usually requires a heavy backend server. This tool is built to use a WebAssembly (Wasm) port of FFmpeg. It loads the massive GIF into your browser's local RAM, decodes the individual image frames, and re-encodes them into an H.264 MP4 video stream entirely client-side. Your files are never uploaded anywhere.

How to Mimic a GIF in HTML

If you replace a .gif with an .mp4 on your website, it won't auto-play by default; it will look like a paused video with a play button. To make the MP4 behave exactly like a GIF, you must use the following HTML attributes: <video autoplay loop muted playsinline>. The muted tag is strictly required, or modern browsers will block the auto-play.

The Transparency Limitation

Be aware: The standard H.264 MP4 video codec does not support an alpha channel (transparency). If your original GIF had a clear background, the FFmpeg encoder will automatically fill the transparent void with a solid color, which is usually black.