Audio Converter
Upload audio files or drag and drop
MP3, WAV, M4A, AAC, OGG or FLAC. Files never leave your device.
Conversion runs entirely in your browser using WebAssembly. Your audio is never uploaded. Large files use more memory, so very long recordings may be slow on older devices.
Convert audio files between MP3, WAV, OGG and FLAC without uploading them anywhere. Drop in one file or a whole batch, choose the output format and quality, and download the results. Everything runs on your device using WebAssembly, so your recordings never leave your browser. It reads common inputs like MP3, WAV, M4A, AAC, OGG and FLAC, which makes it a quick way to standardise a mixed folder of audio.
How to use this tool
- 1Drag your audio files onto the upload area, or click to browse. You can add several at once.
- 2Choose the output format: MP3, WAV, OGG or FLAC.
- 3Pick a quality setting - MP3 and OGG let you trade size for fidelity, FLAC lets you choose compression effort.
- 4Click Convert. A progress bar shows each file encoding on your device.
- 5Download each file, or use Download all (.zip) when you convert several at once.
Example
Add five WAV takes, choose MP3 at 192 kbps, and click Convert. Each file encodes in your browser and you download all five as a single zip. A 50 MB WAV typically becomes a 3-5 MB MP3 at 192 kbps.
Drop an M4A memo, choose WAV, and convert. The output is uncompressed 16-bit PCM WAV ready for editing. WAV is larger than the M4A because it stores full audio data with no compression.
Common use cases
- Turning a folder of WAV recordings into small MP3s to email or upload
- Converting a downloaded M4A voice memo into MP3 for a player that will not read M4A
- Making lossless FLAC copies of WAV masters for archiving without extra size of WAV
- Standardising a mixed batch of MP3, M4A and OGG files into one format for an app
- Extracting a plain WAV from a compressed file to edit in software that prefers uncompressed audio
Common mistakes
- Expecting MP3 or OGG to sound identical to the source - both are lossy, so pick a higher bitrate or quality if fidelity matters.
- Converting an MP3 to WAV or FLAC and thinking it becomes higher quality - lossless output cannot restore detail the MP3 already discarded, it just makes a larger file.
- Choosing WAV or FLAC for email attachments - they are much larger than MP3, so use MP3 when size matters.
- Uploading a very long recording on an old phone - decoding to raw audio uses memory, so long files can be slow or fail on low-memory devices.
- Assuming the sample rate changes - the tool keeps the decoded sample rate, it does not resample to a target rate.
Frequently asked questions
Which formats can I convert between?
It reads common inputs including MP3, WAV, M4A, AAC, OGG and FLAC, and writes MP3, WAV, OGG (Vorbis) or FLAC. So you can go from most everyday audio files to any of those four output formats.
What is the difference between MP3 and FLAC?
MP3 is lossy: it discards some audio data to make small files, and quality depends on the bitrate. FLAC is lossless: it compresses without discarding anything, so it sounds identical to the source but files are larger. Use MP3 for size, FLAC for archiving.
Is my audio uploaded to a server?
No. Decoding and encoding both run on your device using the browser's audio engine and WebAssembly. Your files are never sent anywhere, which is why the tool still works if you disconnect from the internet after the page loads.
What if my file will not convert?
The tool relies on your browser to decode the input. If a format is not supported by your browser (some browsers cannot read OGG or certain M4A files), you will see a clear message. Try a different browser such as Chrome, or convert the file to WAV first.
Does converting change the sample rate or channels?
It keeps the decoded sample rate and channel layout of your file. It does not upsample, downsample, or force mono, so a 44.1 kHz stereo file stays 44.1 kHz stereo in the output.
Can I convert several files at once?
Yes. Add as many files as you like and they convert one after another to keep memory use reasonable. When more than one finishes you can download them together as a single zip file.
Is there a file size limit?
There is a 150 MB per-file guard to avoid crashing the browser tab. Conversion happens in memory, so very large or very long files use more RAM and are slower, especially on phones and older computers.
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