Convert M4A to WAV: Free Online Converter
Convert MPEG-4 Audio to Waveform Audio online for free. Fast, secure audio conversion with no watermarks or registration.
M4A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 M4A files
M4A holds AAC or Apple Lossless audio in an MP4 container. iPhone voice memos, GarageBand exports and iTunes downloads are often M4A.
People convert M4A to WAV to edit a recording in software that wants WAV, to load it into a transcription or phone system, or to import it into a video editor without trouble.
How we convert M4A to WAV
- Output
- 16-bit PCM WAV.
- Sample rate
- Kept from the M4A unless you pick 44.1 kHz, 48 kHz or 96 kHz.
- Channels
- Keep stereo or switch to mono, which suits voice memos.
- Clean-up
- Normalize, noise reduction and trim are available before conversion.
Common problems and fixes
A voice memo is too quiet to transcribe.
Turn on normalize before you convert so the speech reaches a clear level.
A video editor wants 48 kHz audio.
Set the sample rate to 48 kHz, which is the standard for video.
The WAV sounds no better than the M4A.
That is normal for AAC sources. WAV cannot bring back what the AAC encoder removed. It only makes the file easier to edit.
M4A から WAV への設定
- エンジン
- メディア
- 設定
- 調整できる設定: 11
- Trim Start
- Trim End
- Volume
- Fade In
- Fade Out
- Sample Rate
- Bit Depth
- Channels
- Audio Channels
- Reverse Audio
- Strip Metadata
M4AからWAVへの変換について
WAV (Waveform Audio File Format) is the uncompressed audio standard created by Microsoft and IBM in 1991. Converting M4A to WAV decodes the AAC or ALAC audio inside the M4A and writes it as raw PCM samples. WAV is universally supported by every operating system, DAW, audio editor, and hardware device. This conversion is the go-to when you need uncompressed audio for editing, processing, mastering, or feeding into systems that require raw PCM input.
M4AをWAVに変換する理由
DAWs like Pro Tools, Ableton Live, FL Studio, and Audacity work most efficiently with WAV files. Sample-based instruments and hardware samplers (Akai MPC, Roland SP, Elektron Digitakt) require WAV input. Broadcast and live sound systems often need WAV for reliability — no codec decoding means no latency or compatibility risks. CD mastering requires Red Book-compatible 16-bit/44.1 kHz WAV files.
主な活用例
- Importing M4A into DAWs (Pro Tools, Ableton, FL Studio) for editing and production
- Loading audio into hardware samplers that accept only WAV format
- Preparing audio for live sound playback systems where uncompressed format is required
- Creating 16-bit/44.1 kHz WAV masters for CD burning
- Converting Voice Memo M4A recordings to WAV for archival in a universal format
- Feeding audio into analysis tools that require raw PCM input
仕組み
Our media engine decodes the M4A container's audio (AAC or ALAC) to PCM and writes it into a WAV container using RIFF structure. WAV stores PCM data in little-endian byte order. Our output is 16-bit PCM at the source sample rate, or at 44.1, 48 or 96 kHz if you choose one. WAV itself supports up to 32-bit float at 384 kHz. For files over 4 GB, RF64 (WAV64) is required due to the 32-bit size field limitation in standard WAV headers.
品質とパフォーマンス
If the M4A contains 16-bit ALAC: the WAV is bit-perfect lossless (24-bit ALAC is reduced to 16-bit). If the M4A contains AAC: the WAV faithfully stores the decoded lossy audio. Converting lossy to uncompressed does not improve quality — the file grows ~10x but sounds identical to the M4A played back in real time.
デバイス互換性
| Device | M4A | WAV |
|---|---|---|
| Windows PC | Partial | Native |
| macOS | Native | Partial |
| iPhone/iPad | Native | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | Native |
プラットフォーム別の推奨設定
Spotify
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Apple Music
Resolution: N/A
Bitrate: 256 kbps
AAC format required
SoundCloud
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Podcast
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
最良の結果を得るためのヒント
- 1Match the sample rate to your DAW session for seamless import; the WAV is always 16-bit
- 216-bit/44.1 kHz for CD mastering, 24-bit/48 kHz for video production audio
- 3Be aware of the 4 GB WAV size limit — for very long recordings, use RF64 or split into segments
- 4WAV metadata support is limited — keep the M4A for tagging and the WAV for production
- 5Convert on demand rather than maintaining a duplicate WAV library to save storage
関連する変換
M4A to WAV produces universally compatible uncompressed audio for production, mastering, and hardware playback. It is a standard studio workflow step for bringing Apple ecosystem audio into professional tools.
M4AとWAVの比較
| 特徴 | M4A | WAV |
|---|---|---|
| 正式名称 | MPEG-4 Audio | Waveform Audio File Format |
| 拡張子 | .m4a | .wav |