Convert MP3, M4A, OGG, FLAC or WEBM to uncompressed WAV, with control over sample rate and mono/stereo.
Because browsers cannot do it honestly without help. They decode a long list of formats, but the only format they can reliably encode on their own is WAV. Offering an MP3 button would mean shipping a megabyte of extra codec, so we do the part that works properly and tell you where the line is instead of faking it.
44.1 kHz is CD quality and the safe default for music. 16 kHz is the standard for speech and what transcription models expect — it makes files far smaller with no meaningful loss on voice. Choosing a higher rate than the source adds no detail, only bytes.
WAV stores every sample uncompressed. An MP3 packs the same audio into roughly a tenth of the space by throwing detail away. Converting back cannot recover what the MP3 discarded — you get a lossless container around already-lossy audio, which is why WAV is best treated as a working format, not an archive one.
This tool runs entirely in your browser. Your file is processed on your device and is not uploaded to a server.