MP3 or WAV for vocal removal? Choose the next handoff carefully
Use the best original you actually have. A WAV made from an MP3 does not restore missing information. WAV can avoid another lossy editing handoff; it does not make separation perfect.
1. Separate the extension from the recording’s history
A .wav extension does not tell you whether the recording was once a low-bitrate MP3. Renaming is not conversion, and decoding a compressed copy into WAV does not recreate its original master. Avoid a chain of conversions before upload.
2. Choose a format and check upload and download rules
| You have or need | Practical choice | Reason |
|---|---|---|
| An original WAV or FLAC | Upload the original if it fits the limits. | No need to create an MP3 just to feed the separator. |
| Only an MP3 or M4A | Upload the existing supported file once. | A preparatory WAV conversion cannot restore discarded detail. |
| Rehearsal playback on a phone | MP3 is a convenient final download. | Smaller files are easier to transfer and manage. |
| Further editing or mixing | Use WAV when available or preserve decoded audio in the editor. | Avoid another lossy encode after every small edit. |
| A noisy or distorted source | After the full result is ready, compare the difficult passage with the original. Check both the wanted detail and unwanted leakage before choosing a track. | A larger output file is not an audio-repair method. |
3. Understand file size and avoid needless conversions
Uncompressed PCM size depends on duration, sample rate, bit depth and channel count. A five-minute stereo file at 44.1 kHz and 16-bit contains about 52.9 MB of audio data: 300 × 44,100 × 2 channels × 2 bytes. At 24-bit the example is about 79.4 MB. Headers add some overhead.
4. Know the actual upload and download rules
Free input: MP3 or WAV; credit-funded input also supports FLAC and M4A. Free output: MP3 or 16-bit WAV; credit-funded output also includes FLAC and M4A. Select one export format before processing. Downloading a generated file again is free; other formats are not created automatically.
5. A handoff without needless copies
- Keep the original source unchanged.
- After the full result is ready, compare the difficult passage with the original. Check both the wanted detail and unwanted leakage before choosing a track.
- Download for the next task. Do not convert files just to make extensions match.
- In an editor, save the working project instead of exporting a new MP3 after each edit.
- Create a final delivery copy once the edit is finished and test it on the destination device.