How do I convert MP3 audio to M4A without losing quality?
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Upload the MP3 file and our converter chooses the M4A codec / bitrate combination that matches the source. Lossless target (M4A = WAV / FLAC / ALAC) preserves every sample; lossy target (M4A = MP3 / AAC / OGG) defaults to 192 kbps which is transparent for most ears.
Will going from MP3 to M4A reduce my audio quality?
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If MP3 is lossy and M4A is lossless (e.g. MP3 → WAV), the M4A file is no better than the MP3 — you can't recover information that's already been thrown away. If MP3 is lossless and M4A is lossy, expect the M4A codec to recompress; at 192 kbps this is transparent for most content.
Does the MP3 to M4A converter keep ID3 / metadata tags?
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Yes — title, artist, album, year, track number, album art are read from MP3 and written into the M4A container (where the M4A format supports tags, which all common ones do).
Can I batch convert hundreds of MP3 files to M4A?
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Yes — drop a folder of MP3 files in and we process them in parallel. Premium has more parallel workers and no per-file size cap, so a 500-file batch finishes in minutes rather than tens of minutes.
Will the M4A keep the same sample rate as MP3?
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By default yes (48 kHz MP3 → 48 kHz M4A). If you need to downsample for compatibility (e.g. 96 kHz → 44.1 kHz for CD burning) the advanced sample-rate option does this with high-quality resampling.
Can I normalize loudness in the MP3 to M4A step?
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是的,响声标准化选项将ITU-R BS.1770/ EBU R128 正常化应用于 `M4A产出,目标是 -14 LUFS(流标准)或 -16 LUFS(播客标准)。
If the MP3 download is unprotected (no DRM), yes. DRM-encrypted streaming files (Spotify, Apple Music) are encrypted at the bit level and we can't process them. Sources from Bandcamp, SoundCloud download, and personal recordings convert fine.