Does the AIFF to M4A converter keep ID3 / metadata tags?
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Yes — title, artist, album, year, track number, and album art are read from the AIFF container and written into the M4A container where the format supports tags. All common targets (MP3, AAC, FLAC, OGG) handle tags fine; raw WAV does not.
我可以批量转换成 AIFF 成百上千个文件 M4A 吗?
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Yes — drop a folder of AIFF 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.
Yes — uploaded AIFF files are processed in isolated workers and deleted within minutes. We never play back, store long-term, or share the audio content. The full retention window is in /privacy/.
转换一个 1小时 AIFF 到 M4A 需要多久?
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Same-codec re-mux: 10 to 30 seconds. Re-encode to a different codec: typically 10 to 20% of source duration, so a 1-hour AIFF → M4A finishes in 6 to 12 minutes. Batch jobs parallelize across workers for further speedups.
Why is the M4A louder or quieter than the AIFF source?
If the AIFF download is unprotected (no DRM), yes. DRM-encrypted streams (Spotify, Apple Music tracks) are encrypted at the bit level and we cannot process them. Bandcamp, SoundCloud downloads, personal recordings, and podcast files convert cleanly.
