How to Convert MP3 to WAV Online
Add your MP3 file
Drag an MP3 onto the upload area or click Choose MP3 File to pick one from your device. The tool reads the file directly in your browser, so the audio is processed on your device. The file name and size appear once it loads.
Convert to WAV
Click Convert to WAV. The browser decodes the compressed MP3 into raw audio samples with the Web Audio API, then re-encodes them as a 16-bit PCM WAV. The original sample rate and channel layout (mono or stereo) are preserved exactly as decoded.
Download the WAV
When the conversion completes you see the original MP3 size next to the new WAV size, which will be noticeably larger because WAV is uncompressed. Click Download WAV to save the file, or Convert Another to start over with a different MP3.
MP3 vs WAV: What Changes
MP3 and WAV both hold the same audio, but they store it very differently. MP3 is compressed and small; WAV is uncompressed and large. This converter decodes the MP3 and writes a 16-bit PCM WAV, so the result is a faithful lossless copy of the decoded audio rather than a higher-quality remaster.
| Property | MP3 (input) | WAV (output) |
|---|---|---|
| Compression | Lossy, data permanently discarded | Uncompressed PCM, nothing discarded |
| File size (3 min stereo) | About 3-4 MB at 192 kbps | About 32 MB at 44100 Hz |
| Bit depth | Determined by encoder, not stored as PCM | 16-bit PCM |
| Sample rate | Set when the MP3 was created | Same rate as decoded by the browser |
| Channels | Mono or stereo | Original layout preserved |
| Best use | Streaming, sharing, storage | DAWs, editing, mastering, archiving |
When MP3 to WAV Makes Sense
Importing into a DAW
Many editors and digital audio workstations work most reliably with PCM WAV. Converting first gives you a standard 16-bit WAV that imports into Pro Tools, Logic, Ableton Live, and FL Studio without any extra transcoding step.
Hardware that needs WAV
Samplers, some media players, and embedded devices often require uncompressed WAV input. Use this tool to produce a compatible file when MP3 is not accepted.
Editing without re-compression
If you plan to cut, mix, or process the audio, working from a WAV avoids stacking another round of lossy compression on top of the MP3 while you edit.
When to skip it
If your goal is better sound, converting will not help. The data MP3 removed during compression cannot be restored, and the WAV will simply be a larger file with the same audible quality.
Common Problems and Fixes
Failed to decode audio
The browser could not read the file as audio. Confirm it is a real, complete MP3 and not a renamed file or a partial download. Some unusual or corrupted MP3 streams cannot be decoded by the Web Audio API; try re-exporting the source or using the full Audio Converter.
The WAV is much bigger than the MP3
This is expected. WAV stores every sample uncompressed, so a few-megabyte MP3 can become around 32 MB for a typical 3-minute stereo track. The size jump is normal and does not indicate added quality.
Conversion is slow or the tab stalls
Decoding and re-encoding happen on your device, so long files use more memory and time. Very large files (roughly 50-100 MB and up) may strain a mobile browser. Close other tabs, or split long audio before converting.
Sample rate is not what I expected
The output uses the sample rate the browser produced when decoding the MP3, which follows the source file. This tool does not offer a resampling option, so set the rate in the original export if you need a specific value.