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免费 Video Converter

Convert video between MP4, WebM, MOV, MKV, and AVI. Great for making WebM play on iPhones or turning MOV into MP4. No upload — runs in your browser.

无文件大小限制文件保持私密无需登录永久免费

将文件拖放到此处或点击浏览

MP4, WebM, MOV, AVI, MKV, Video 无文件大小限制

浏览文件

你的文件永远不会离开你的设备。所有处理都在你的浏览器中本地进行。

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Convert WebM to MP4 Convert MOV to MP4 Convert MP4 to WebM Convert MKV to MP4 Convert Video for Editing

工作原理

Converting between video containers and codecs normally means uploading to a conversion site. This converter runs the real FFmpeg engine in your browser, so the file never leaves your device.

1
FFmpeg.wasm loads once
The WebAssembly build of FFmpeg (~30 MB) downloads on first use and is cached for instant reuse.
2
You pick a target format
Your video is loaded into FFmpeg's in-memory filesystem. Nothing is uploaded — it stays in your browser's RAM.
3
FFmpeg re-encodes to the new format
The same x264/VP9/MPEG-4 encoders desktop FFmpeg uses run locally on your CPU to produce MP4, WebM, MOV, MKV, or AVI.
4
The converted file is offered for download
The result is handed back as a downloadable blob and (for web-playable formats) previewed in-page.

A common need is making a WebM play on an iPhone (iOS Safari can't play WebM) — converting to MP4 fixes it instantly, with no upload, no queue, and no watermark.

为什么选择我们的？

✓Completely free — no hidden costs, ever

✓No account, email, or login required

✓Files stay on your device — processing happens in your browser

✓Works on any device — phone, tablet, desktop

✓No watermarks on any output

✓Browser memory limits may apply for very large files

免费 Video Converter

Optimize for your platform

工作原理

为什么选择我们的？

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