Choose the input
Choose an audio file your browser can open, such as MP3 or WAV.
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Audio Converter — Convert Audio Online
Decode a browser-supported audio file and export a WAV or MP3 copy locally, with channel and bitrate controls for editing, sharing or compatibility. No account or software installation is required.
AUDIO STAYS ON YOUR DEVICE
Your file stays on this device while you edit it. This tool does not upload your audio.
Three steps from input to answer
Use the live tool
Review its duration, channels and sample rate, then choose WAV or MP3 and the output settings.
Check the result
Press Export, keep the tab open while the new file is prepared and check the download on your device.
THE BASICS
What is an audio converter?
An audio converter changes the container or encoding used to store sound. This browser tool converts decodable audio into uncompressed 16-bit PCM WAV or a newly encoded MP3 at 128, 192, 256 or 320 kbps.
This page gives you a dedicated workspace for audio converter, followed by practical guidance for checking and using the result. If you need a different workflow, the related tools below make it easy to continue without starting over.
HOW IT WORKS
How does an audio converter work?
The browser decodes the source codec into raw audio samples. WAV export writes those samples into a RIFF/WAVE structure; MP3 export resamples when necessary and uses the bundled JavaScript LAME encoder. Source, mono and stereo channel modes are available, and the original file is not modified.
The browser decodes a complete supported file into floating-point audio samples. WAV export writes those samples as 16-bit PCM in a RIFF/WAVE container. MP3 export converts samples to 16-bit integers, resamples to a supported MP3 rate when needed and encodes at 128, 192, 256 or 320 kbps with the bundled JavaScript LAME implementation. Channel controls can preserve the source, mix to mono or create stereo output.
The page creates a new file in browser memory and leaves the source unchanged. Decode and encode support depends on the current browser, so preview the processed version and verify the saved download before using it in another workflow.
Where this tool helps
WAV is useful for editing and interchange, while MP3 is smaller and convenient for compatible sharing. Choosing the output deliberately avoids treating every conversion as a quality improvement.
Create an editing WAV
Move a decodable compressed source into a widely supported uncompressed working file.
Make a compact MP3
Choose a practical bitrate for sharing a copy when smaller size matters.
Convert stereo to mono
Prepare speech or compatibility audio with one mixed channel.
Resolve editor compatibility
Decode a browser-supported source that another simple program refuses to open.
BETTER RESULTS
How to get a useful result
WAV is the safer working format for editing because it avoids a new lossy generation, but it creates a much larger file. MP3 is convenient for compact delivery; higher bitrate usually reduces encoding artifacts but cannot restore information missing from a compressed source. Converting an old low-bitrate MP3 to WAV changes storage, not the original detail.
Begin with a short, known source when testing the workflow: Choose an audio file your browser can open, such as MP3 or WAV. Preserve the original, use a new output name and audition the downloaded file in a separate player before replacing any production asset.
If the export is not right
- Try WAV or MP3 input when the browser does not include the codec needed for M4A or FLAC.
- Keep the original file because conversion cannot reconstruct missing compressed detail.
- Use WAV for further editing and avoid repeated MP3-to-MP3 generations when quality matters.
USEFUL CONTEXT
Codec, container and file extension
A container describes how data is packaged, while a codec describes how the sound is represented. Common PCM WAV files contain uncompressed samples; MP3 uses perceptual lossy compression. A new extension alone does not perform conversion, which is why this tool decodes and writes a new audio stream rather than simply renaming the file.
QUALITY CHECK
Check an export before you use it
Preview the boundary or processed version with a little context before and after the important sound. Headphones make clicks, clipped syllables, over-reduced center material and abrupt fades easier to notice. Keep the source file unchanged and choose a short test export first when you are working on a long recording or a phone with limited memory.
After export, open the downloaded file in a separate player and confirm its beginning, ending, channel balance, duration and format. Re-encoding can change file size and sound even when the timing is correct. That final playback check is especially useful before replacing a production asset, sending a clip to someone else or deleting any earlier version.
EXAMPLE
How to read the result in practice
You can decode an MP3 or browser-supported M4A and export WAV before editing, or turn a WAV voice recording into a smaller 192 kbps MP3. WAV will usually be much larger because it stores uncompressed samples.
What to keep in mind
Input support depends on codecs built into the browser and operating system. MP3 output is a lossy re-encode, large files can take time on mobile devices, metadata and artwork are not preserved, and conversion cannot restore detail already lost in a source.
Check the saved file from beginning to end, confirm its format and channel layout, and return to the unchanged source if a boundary, codec choice or processing artifact needs correction.
Learn more about this tool
These technical references provide extra background on the browser features, audio formats or music concepts used on this page.
REFERENCE
MDN: decodeAudioData()
Read the original reference for more detail.
View reference ↗REFERENCELibrary of Congress: WAVE Audio File Format
Read the original reference for more detail.
View reference ↗REFERENCELAME MP3 Encoder
Read the original reference for more detail.
View reference ↗Your audio stays private
Selected files are processed in your browser and are not uploaded to Music Tools Lab. Keep this tab open while the tool is working. Read about privacy & accuracy.
Frequently asked questions
Does converting audio improve quality?+
No. Conversion can improve compatibility, but it cannot recreate information removed by earlier lossy compression. WAV preserves the decoded result without another lossy encode.
Why is the WAV file much larger?+
PCM WAV stores sample values with little or no compression. MP3 and M4A use perceptual compression to reduce size, so an equivalent WAV commonly occupies far more space.
Can I convert WAV to MP3 here?+
Yes. Choose MP3 and a bitrate from 128 to 320 kbps. The browser performs a new lossy encode locally, so the result can be smaller but cannot improve the source.
Which input formats work?+
MP3 and WAV are the safest choices. M4A, AAC, OGG and FLAC support varies with browser and operating system; the tool reports a clear decode error when unsupported.
Is the original file changed?+
No. The converter reads the local selection and creates a new download. Your original file remains untouched on the device.