Video Conversion
Convert MP4 to ASF Online — Free
Fast, free MP4 to ASF converter. No registration required.
またはインポート元
200万以上のファイル変換
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処理後にファイルを自動削除
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すぐに変換を開始
どこでも動作
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変換方法
1
Upload your .mp4 file by dragging it into the upload area or clicking to browse.
2
Choose your output settings. The default settings work great for most files.
3
Click Convert and download your .asf file when it's ready.
MP4とは？
MP4 is the most widely used video container format. It stores video, audio, subtitles, and metadata. Compatible with virtually every device and platform, from smartphones to smart TVs.
形式の詳細
- 正式名称
- MPEG-4 Part 14
- 拡張子
- .mp4
主な特徴
- Universal compatibility
- Streaming support
- Small file sizes
- Hardware-accelerated playback
ASFとは？
ASF is a Microsoft container format designed for streaming audio and video. It can contain various codecs including WMV and WMA.
形式の詳細
- 正式名称
- Advanced Systems Format
- 拡張子
- .asf
主な特徴
- Streaming optimized
- Microsoft format
- DRM support
- Web delivery
MP4とASFの比較
| 特徴 | MP4 | ASF |
|---|---|---|
| 正式名称 | MPEG-4 Part 14 | Advanced Systems Format |
| 拡張子 | .mp4 | .asf |
| 最適な用途 | Universal compatibility | Streaming optimized |
よくある質問
Our converter preserves resolution, frame rate, and audio tracks by default. The ASF output uses optimized codec settings to maintain quality as close to the original MP4 as possible.
Free users can convert videos up to 100MB. Pro users can convert files up to 2GB with server-side processing — no software installation needed.
Most videos convert in under 60 seconds. Longer or higher-resolution files may take 1-3 minutes. Processing runs on our servers, so your device stays fast.
Yes. Our video converter is browser-based — works on iPhone, Android, tablet, and desktop. No app download required.
Yes. Audio is preserved by default during video conversion. You can also adjust audio codec, bitrate, and volume in the advanced settings.