文件与媒体
视频格式转换器
MP4, WebM, MOV, AVI, MKV — all directions.
Drop a file or click to browse
MP4, WebM, MOV, AVI, MKV — re-encoded with sensible defaults
FFmpeg.wasm runs entirely in your browser. The first use downloads ~30 MB of engine — cached for every subsequent run.
编辑注
Understanding · Containers, codecs, and three numbers that matter.
本深度章节目前仅有英文版本。上方的转换工具支持您的语言;长篇说明文章尚未翻译。
常见问题
Quick answers.
›Is my video uploaded to a server?
No. The conversion happens locally on your computer using your browser's resources, so your video data never leaves your device.
›Which video formats are supported?
We support most standard containers including MP4, WebM, MOV, AVI, and MKV, along with common codecs like H.264 and VP9.
›What is the maximum file size?
The limit depends on your system's available RAM, as the entire conversion process runs within the browser's memory environment.
›Will I lose quality during conversion?
Transcoding often involves some loss of data. Use a high-bitrate setting or high-quality preset to minimise visible artifacts in the output file.
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