変換元フォーマット
AAC is a lossy audio codec that is efficient at moderate bitrates.
AAC
AAC is a file format supported by Convertr for online file conversion workflows.
M4A
M4A is a file format supported by Convertr for online file conversion workflows.
What happens when AAC becomes M4A
ターゲットフォーマット
M4A is an MPEG-4 audio container that commonly carries AAC or Apple Lossless audio.
どんな変化
Audio samples are decoded from AAC and encoded according to the M4A format and selected bitrate or quality.
- 何が保持されるか
- Duration and audible content are preserved, subject to decoder support and any settings you change.
- What may be lost
- Tags, embedded artwork, chapters, and codec-specific metadata may not map to M4A.
- Codec and quality implications
- Inspect the output before replacing the source, especially when the formats use different layout, codec, or editing models.
- Realistic limitations
- Protected audio, malformed headers, unsupported codec variants, or files without a decodable audio stream cannot be converted.
変換ステップ
- Upload a AAC file no larger than 1 GB.
- Confirm that M4A is selected as the target.
- Start the conversion. A healthy compatible worker begins processing immediately.
- Download the M4A file and check the result before deleting your source.
トラブル解決
- The AAC file is rejected or will not open.
- Confirm that the file is not empty, password-protected, or corrupt and that its real format matches the extension.
- The M4A file is larger than expected.
- Choose a more efficient codec or lower quality setting when available. Lossless and uncompressed targets are often larger by design.
- The result has no sound or will not play.
- Try a broadly supported target codec and verify that the source contains a decodable audio stream.
プライバシーとファイル保管
Uploads and converted files are processed automatically and irreversibly deleted within 24 hours. You can delete them sooner with the delete control. Convertr does not read, mine, sell, or manually review file contents.
Read the privacy policy