Audio Conversion
Convert iPhone Audio to AAC Online — Free
Fast, free iPhone Audio to AAC converter. No registration required.
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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
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変換方法
1
Upload your .m4a 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 .aac file when it's ready.
iPhone Audioとは？
iPhone-optimized audio format using AAC encoding at 256kbps. Configured for high-quality playback on iPhone devices with full Apple ecosystem compatibility.
形式の詳細
- 正式名称
- iPhone Compatible Audio
- 拡張子
- .m4a
主な特徴
- iPhone optimized
- AAC 256kbps
- Apple ecosystem
- AirPlay compatible
AACとは？
AAC is an audio coding standard designed to be the successor of MP3. It provides better sound quality at similar bit rates.
形式の詳細
- 正式名称
- Advanced Audio Coding
- 拡張子
- .aac
主な特徴
- Superior to MP3
- Streaming optimized
- Wide support
- Efficient compression
iPhone AudioとAACの比較
| 特徴 | iPhone Audio | AAC |
|---|---|---|
| 正式名称 | iPhone Compatible Audio | Advanced Audio Coding |
| 拡張子 | .m4a | .aac |
| 最適な用途 | iPhone optimized | Superior to MP3 |
よくある質問
Converting between lossless formats preserves perfect quality. When converting to lossy formats, our optimized encoding minimizes any audible difference. You can adjust bitrate to control quality vs. file size.
We preserve ID3 tags, album art, and metadata when both iPhone Audio and AAC support them. Some metadata may not transfer between incompatible formats.
Pro users can batch convert multiple audio files simultaneously. Free users convert one file at a time with up to 5 free conversions per day.
We support all standard sample rates from 8kHz (voice) up to 192kHz (studio quality). The default preserves your source file's sample rate.
Yes. Our audio converter handles music, podcasts, voice memos, and audiobook files. For podcasts, we recommend MP3 at 128-192kbps for the best balance of quality and file size.