Does the WAV to MP3 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 MP3 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 MP3 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 MP3 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 → MP3 finishes in 6 to 12 minutes. Batch jobs parallelize across workers for further speedups.
Why is the MP3 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.