Convert WMV to MP4: Free Online Converter
Convert WMV files to MP4 format instantly. Free online converter for Windows Media videos. Works on all devices.
WMVに対応
アップロードすることで、これらのファイルの権利を有していること、および利用規約に同意することを確認したものとみなされます。
変換設定: ファイルを追加すると調整できます
安全な転送
HTTPS暗号化アップロード
プライバシー優先
ゲストのファイルは約2時間で自動削除
登録不要
すぐに変換を開始
どこでも動作
あらゆるブラウザ、あらゆるデバイス
About WMV files
WMV (Windows Media Video) is Microsoft's older video format. It was common for Windows Movie Maker projects, training videos and downloads from the 2000s.
Macs, iPhones, Android phones and most web platforms do not play WMV without extra software. MP4 with H.264 plays on all of them.
How we convert WMV to MP4
- Always re-encoded
- WMV cannot be copied into MP4, so the video is re-encoded to H.264 High profile at CRF 23.
- Audio
- Windows Media Audio is converted to AAC at 192 kbps.
- Resolution
- Kept as in the WMV. We never upscale small videos.
- Quality presets
- High (CRF 18), Medium (CRF 23) and Low (CRF 28) let you trade size for detail.
Common problems and fixes
The WMV will not open on a Mac.
Convert it to MP4 here, then open the MP4. macOS plays H.264 MP4 without any add-on.
The picture looks blocky in the MP4.
Old WMV files are often low bitrate, and the MP4 cannot restore lost detail. Choose the High preset so no more detail is lost.
The file is protected and fails to convert.
Some purchased or rented WMV files use copy protection. We cannot convert protected files, only normal ones.
WMV から MP4 への設定
- エンジン
- メディア
- 設定
- 調整できる設定: 31
- Trim Start
- Trim End
- Volume
- Audio Fade In
- Audio Fade Out
- Video Codec
- Quality (CRF)
- Encoding Speed
- Profile
- Level
- Tune
- Resolution
WMVからMP4への変換について
WMV (Windows Media Video) was Microsoft's answer to video compression in the early 2000s, but the format has become increasingly problematic in today's cross-platform world. Mac users can't play WMV natively. Smartphones struggle with the format. Even modern Windows PCs sometimes require codec packs. Converting WMV to MP4 modernizes your video library for universal playback.
Our WMV to MP4 converter transforms legacy Windows Media files into the universally accepted MP4 format. The process preserves video quality while dramatically improving compatibility. Most devices that struggle with WMV play MP4 flawlessly without any additional software.
WMVをMP4に変換する理由
WMV's platform limitations create constant headaches. Videos that play fine on older Windows PCs fail on MacBooks, iPhones, Android phones, and smart TVs. Sharing WMV files means recipients often can't view them. The format's age shows in these daily frustrations.
MP4 eliminates compatibility concerns entirely. It's the lingua franca of digital video—every modern device and platform supports it natively. No codec packs, no player apps, no workarounds needed.
The conversion also benefits video quality. MP4's H.264 codec achieves better quality per byte than WMV's older compression. Your converted files can actually look better while being smaller, especially for older WMV files encoded at low bitrates.
主な活用例
- Play old Windows Media files on Mac computers
- Share WMV recordings with iPhone and Android users
- Upload legacy videos to social media platforms
- Watch WMV files on smart TVs and streaming devices
- Import Windows Media videos into modern editing software
- Archive corporate training videos in a future-proof format
仕組み
Our converter decodes WMV using robust Windows Media decoding, handling both WMV7, WMV8, and WMV9 codecs. Video is re-encoded to H.264 at CRF 23, while audio converts to AAC at 192 kbps.
For WMV files with Windows Media Audio (WMA), the converter extracts and transcodes to AAC seamlessly. The channel setting lets you mix multi-channel audio down to stereo or mono.
品質とパフォーマンス
WMV to MP4 requires transcoding since the codecs are fundamentally different. Our encoder produces MP4 files that match or exceed WMV visual quality. For heavily compressed WMV source files, the conversion cannot restore detail—quality reflects the original encoding.
デバイス互換性
| Device | WMV | MP4 |
|---|---|---|
| iPhone/iPad | No | Native |
| Android | No | Native |
| Windows PC | Native | Native |
| Mac | No | Native |
| Smart TV | No | Native |
| Web Browser | No | Native |
WMV to MP4: real-world performance
| Speed | ~5 seconds for a 10-second clip. |
| Output size | Comparable to the source at a visually-lossless default. |
| Quality | Re-encoded to H.264/AAC — plays on Mac, iOS and phones where WMV won't. |
| Engine | Media engine (H.264), server-side. |
Measured on our servers, June 2026, on a 10-second 1280×720 clip. See all measured conversions →
プラットフォーム別の推奨設定
YouTube
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 High Profile, AAC audio
Instagram Reels
Resolution: 1080x1920
Bitrate: 3.5 Mbps
Vertical 9:16, max 90 seconds
Resolution: 960x540
Bitrate: 1-2 Mbps
Max 16MB, keep under 3 minutes
TikTok
Resolution: 1080x1920
Bitrate: 4-6 Mbps
Vertical, max 10 minutes
Twitter/X
Resolution: 1920x1080
Bitrate: 5-8 Mbps
Max 512MB, max 2:20 minutes
Discord
Resolution: 1280x720
Bitrate: 2-4 Mbps
Max 25MB free, 100MB Nitro
最良の結果を得るためのヒント
- 1WMV files from Windows Movie Maker convert well to modern MP4
- 2DRM-protected WMV cannot be converted—only DRM-free files work
- 3Expect 50-70% file size reduction with H.264 encoding
- 4Keep original WMV if you need to edit in legacy Windows software
- 5Batch convert entire folders of old Windows videos efficiently
関連する変換
Bring your Windows Media library into the modern era. Our WMV to MP4 converter creates universally playable videos from legacy files, ending compatibility frustrations forever.
WMVとMP4の比較
| 特徴 | WMV | MP4 |
|---|---|---|
| 正式名称 | Windows Media Video | MPEG-4 Part 14 |
| 拡張子 | .wmv | .mp4 |