Audio / Convert
MP3 to WAV — Local Browser Tool
Convert MP3 audio to WAV locally, with decoding checks, progress, cancellation and a downloadable audio preview.
MP3 to WAV — Local Browser Tool: A PCM WAV copy is useful when an audio editor or playback workflow requires uncompressed samples. It will usually be much larger than the MP3. Converting cannot bring back frequencies or detail removed by MP3 compression, and it does not turn a low-quality source into a high-quality master. Choose an input file smaller than 250 MB. Audio is decoded and exported at 44.1 kHz. Mono stays mono; wider audio is folded to stereo, and the mono option combines the stereo channels if needed. The output is a 16-bit PCM WAV. It has no bitrate control because its size depends on duration, sample rate and channel count. The mono option can halve the sample data for a stereo source. The progress display distinguishes decoding from encoding. Cancel discards the current result; browser decoding may finish its current operation before releasing memory. The encoded file size appears above the download and you can listen to the full output in the page. The original file is unchanged. Large decoded recordings need considerably more memory than their compressed source, so shorter clips work better on phones. Protected or unsupported audio shows a clear error. Runs 100% locally in your browser with zero server file uploads.
- Category
- Video tools
- Runs
- In your browser
- Cost
- Free · no sign-up
- Availability
- Ready to use
Runs entirely in your browser
Click, drag and drop, or paste · stays on this device
Files stay on this device. Up to 250 MB. Decoding support depends on the audio codec; MP3 is lossy and WAV cannot restore detail already lost.
Checking recording support…
Audio encoding
MP3 uses the locally bundled LAME encoder, distributed as a separate replaceable file under the LGPL. LAME source and licence (https://lame.sourceforge.io/) describe the encoder. WAV output contains uncompressed 16-bit PCM samples.
Decoding and quality
The Web Audio specification (https://www.w3.org/TR/webaudio/) describes decoding audio to samples. Browser codec support still determines which sources open. Conversion cannot restore information lost in an earlier lossy encode; keep the original for editing.
How to use it
- Choose a file in the input format shown.
- Adjust the available output controls.
- Create the result, check its preview and download it.
Privacy & limitations
Your file is processed on this device. No image, video or audio is uploaded.
Related tools
Frequently asked questions
Can every MP3 file be converted?
A PCM WAV copy is useful when an audio editor or playback workflow requires uncompressed samples. It will usually be much larger than the MP3. Converting cannot bring back frequencies or detail removed by MP3 compression, and it does not turn a low-quality source into a high-quality master.
Will the output sound better?
Conversion cannot restore detail already lost. MP3 encoding can remove more detail; WAV stores the decoded samples without a further lossy encode. Keep the original when editing or archiving.
Are tags and cover art preserved?
The output contains the decoded audio, with the chosen channel layout and format. Tags, cover artwork and other source metadata are not copied.
Free tool · runs in your browser · no account required