Convert MP3 to WAV in your browser and get a plain 16-bit WAV that audio editors, DAWs, samplers, video editors and WAV-only upload forms all accept. This MP3 to WAV converter is free, needs no sign-up, and works on your own device: each MP3 is decoded and written out as WAV locally, and nothing is uploaded. Convert one file or up to 200 at once and download them as a ZIP. Expect two things. The WAV will be several times larger than the MP3, and converting cannot bring back detail the MP3 encoder already removed.
How it works
- Drop the MP3, or up to 200 of them. Each file is listed with its length and sample rate.
- WAV is already selected on this page. Turn on Trim if you only need part of the track, or add a short fade in or out.
- Convert and download the WAV, or one ZIP of WAVs when you dropped several. The size is shown before you download: expect about 10 MB per minute of stereo.
Questions
- Does converting MP3 to WAV improve the quality?
- No. The detail an MP3 encoder discards is gone once the MP3 is made, and no conversion can rebuild it. The WAV holds what the MP3 decodes to, uncompressed, so it sounds the same as the MP3. What you gain is a file that loses nothing more: you can edit it and save it as often as you like, where every re-save of an MP3 compresses it once again.
- Why is the WAV so much bigger than the MP3?
- WAV stores every sample uncompressed, so its size is set by length rather than content: a minute of CD-quality stereo is about 10 MB. The same minute as a 128 kbps MP3 is about 1 MB, and about 2.4 MB at 320 kbps. So expect the WAV to be roughly 4 to 11 times the size of the MP3 it came from. That is the price of a format any program can read without decoding.
- What kind of WAV file does it make?
- A standard 16-bit PCM WAV with the plain 44-byte header and no extra chunks, the variant every audio editor, DAW, sampler and video editor reads. A mono MP3 stays mono and a stereo one stays stereo. It does not write 24-bit or 32-bit float WAV; for a file that started life as an MP3, those would add size, not detail.
- Does my file get uploaded?
- No. The models and all processing run inside your browser on your own device. You can verify this yourself: open your browser’s DevTools, watch the Network tab, and process a file: there are no uploads. After the first visit most tools also work fully offline.
- Which formats can it read?
- Anything your browser can decode: MP3, WAV, M4A/AAC, OGG, Opus, FLAC and the audio track of MP4/WebM/MOV video. Output is MP3 or WAV, the two formats that open everywhere.
- Does converting to MP3 lose quality?
- MP3 is lossy, so some information is discarded, though at 192 kbps and above most people cannot hear the difference. WAV output is lossless and correspondingly larger. Converting MP3 to WAV does not restore quality that was already gone.