MP4 to WebM
Web 用に MP4 動画を WebM に convert
Drop a video/mp4 video
🔒 Files never leave your device
⚡ Uses FFmpeg WebAssembly. First run downloads ~30 MB (cached after). Encoding takes roughly 1–5× the video's duration.
使い方
- 1Upload your video
Drop or select a video file.
- 2Configure options
Choose the settings that fit your use case.
- 3Download
Save the processed video to your device.
MP4 to WebM について
Browser で FFmpeg-wasm を使って MP4 動画を WebM に変換。より小さいファイルで web embed に最適です。
仕事、勉強、個人利用 — この tool は必要なだけ無料で使えます。Watermark なし、sign-up なし、documents 内の広告もなし。
よくある質問
Are my videos uploaded?
Never. Processing runs entirely in your browser using FFmpeg WebAssembly.
Why is it slow?
Video encoding is CPU-heavy. Expect roughly 1–5× the video's duration for encoding. First-time load also downloads ~30 MB of FFmpeg (cached after).
What's the file size limit?
Depends on your device's memory. Files up to ~1 GB usually work; multi-GB files may crash the tab.
続きを読む
GIF vs MP4 vs WebM: which format for looping video on the web?
GIFs are 25 years old, everyone knows what they are, and they're objectively the worst option for looping video on the web today. Here's why, and what to use instead.
How to compress video for email, web, and social - without losing quality
Gmail caps attachments at 25 MB. Discord at 25 MB. WhatsApp at 16 MB. Here's how to get any video under those limits while keeping it watchable.