Does the WAV to AAC converter keep ID3 / metadata tags?
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Yes — title, artist, album, year, track number, and album art are read from the WAV container and written into the AAC 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 WAV 成百上千个文件 AAC 吗?
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Yes — drop a folder of WAV 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 WAV 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 WAV 到 AAC 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 WAV → AAC finishes in 6 to 12 minutes. Batch jobs parallelize across workers for further speedups.
Why is the AAC louder or quieter than the WAV source?
If the WAV 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.