Will the audio quality be as good as the original?

The output is limited by whatever audio was encoded in the original video. If the video has 128kbps audio, you will not get better than that regardless of the quality setting. High quality just avoids re-encoding at a lower bitrate than the source.

Video to MP3 Converter

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Questions

MP3 works everywhere and is what most people need. AAC gives slightly better quality at the same file size and is the default on iPhones. WAV is uncompressed — best quality but large files, mainly useful for editing in audio software.

The output is limited by whatever audio was encoded in the original video. If the video has 128kbps audio, you won't get better than that regardless of the quality setting. High quality just avoids re-encoding at a lower bitrate than the source.

Audio extraction is faster than compression. A 100MB video usually extracts in 15 to 45 seconds. WAV takes a little longer due to the larger output file.

No. Both the uploaded video and the extracted audio are deleted from the server once you download. Nothing is kept.