Audio Converter
Convert audio to WAV, resample, switch mono/stereo, and normalize volume — all in your browser.
Drop an audio file here or click to browse
MP3, WAV, M4A, OGG, FLAC — decoded locally
How to Use
- 1. Upload an MP3, WAV, M4A, OGG, or FLAC file.
- 2. Choose a sample rate and mono or stereo output.
- 3. Turn on volume normalization if the file is too quiet.
- 4. Click Convert and download the resulting WAV file.
About Resampling and Normalization
Resampling changes how many audio samples represent one second of sound. A higher sample rate captures more detail, especially higher frequencies, at the cost of a larger file. Music is conventionally stored at 44.1kHz; spoken-word recordings lose very little at 16kHz while shrinking substantially.
The conversion here uses the browser's own OfflineAudioContext, the same resampling engine used internally when audio is played at a different rate than it was recorded — so the result matches what your browser would produce natively.
Normalization measures the single loudest sample in the file and scales every sample by the same factor so that peak reaches full volume without clipping. It raises overall loudness but does not compress the dynamic range the way a broadcast loudness normalizer would.
Need to trim instead of convert? Try our Audio Trimmer, or generate speech with Text to Speech.
Frequently Asked Questions
Why does this only export WAV?
Browsers can decode compressed formats like MP3 but do not include an encoder for them — there is no built-in way to write a new MP3. WAV is lossless and universally supported, so it is the only format a browser can produce without a large extra encoder library.
What does "Normalize volume" do?
It scans the whole file for its loudest peak, then scales every sample so that peak reaches (but does not exceed) full volume. Quiet recordings get louder without clipping, and already-loud files are left alone.
What is the difference between mono and stereo?
Stereo carries separate left and right channels for a sense of space; mono combines everything into a single channel. Converting to mono roughly halves the file size and is common for voice recordings and podcasts where stereo width adds nothing.
Why would I change the sample rate?
A lower sample rate produces a smaller file at the cost of high-frequency detail. 44.1kHz is CD quality and safe for music; 16kHz is plenty for spoken voice and cuts file size substantially.
Is my audio uploaded anywhere?
No. Decoding, resampling, and encoding all happen locally using the Web Audio API. The file never leaves your device.
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