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Audio to MP3

Free online tool to convert WAV, M4A, AAC, OGG, OPUS, WebM, FLAC, and other audio files to MP3 locally in your browser

Upload audio

Output audio

Choose a file and start processing. The output audio will appear here.

About this tool

MP3 is a widely compatible lossy audio format for speech, music previews, and general sharing. Conversion decodes the source and re-encodes at the selected bitrate. Lower bitrate reduces size but more readily damages high frequencies, transients, and complex mixes.

The tool processes common audio inputs in the browser and outputs MP3. Transcoding cannot improve a weak source and adds another lossy generation, so begin with the best available file and choose bitrate for the content and listening environment.

How to use it

  1. Upload the source

    Choose an undamaged file with the highest practical quality.

  2. Choose a bitrate

    Speech can be tested lower, while music should be compared from a higher setting.

  3. Listen and download

    Check vocal sibilance, instrument highs, and noise in quiet passages before saving.

Supported range and limits

Input formats
WAV, M4A / AAC, OGG, FLAC, WebM, MP3; anything the browser can decode
Output
MP3 (MPEG-1 Layer III) at the usual 96 / 128 / 192 / 320 kbps steps
Sample rate and channels
Carried over from the source; MP3 supports a limited set of rates, so an unsupported rate is resampled to the nearest one
Metadata
Title, artist and cover art are not guaranteed to survive; re-tag after converting
Size estimate
Roughly bitrate ÷ 8 × seconds; about 0.9 MB per minute at 128 kbps
Where it runs
FFmpeg compiled to WebAssembly in your browser; the file is never uploaded

When you would use it

  • Improving playback compatibility

    Convert an audio format that a browser or device does not read reliably into common MP3.

  • Preparing a shareable file

    Reduce a speech or music sample while retaining acceptable listening quality.

  • Normalising a batch of material

    Convert audio from different recorders and platforms into one MP3 specification so it imports cleanly into an editor or podcast host.

What to know before you start

  • MP3 is not lossless, and a higher setting cannot restore detail absent from the source.
  • Repeated MP3 transcoding accumulates artifacts, so retain a lossless master for editing.
  • Tags, cover art, and chapters may not survive browser transcoding.

Related concepts

bitrate
The amount of data used for each second of audio, commonly measured in kbps.
transcoding
Decoding one audio representation and encoding the result into another.

Frequently asked questions

Does converting to MP3 upload my file?
No. WAV, M4A, FLAC and other audio are decoded and re-encoded to MP3 locally in your browser, with no upload to any server.
Which input formats are supported?
It accepts common formats such as WAV, M4A, OGG, FLAC and WebM, all exported as MP3.
Can I convert files in batch?
Yes. Select several files and convert them one after another, then download each MP3 when it is ready.
Does converting to MP3 hurt quality?
Yes. MP3 is lossy, so information is discarded whatever the source. A higher bitrate can reduce audible loss, but the result still depends on the material, encoder, and listening conditions. Re-encoding a file that is already MP3 adds a second generation of loss.
Which bitrate should I pick?
Speech can usually be tested from a lower step, while complex music should start higher. Follow the destination platform when it has a requirement; otherwise listen for vocal sibilance, background noise, and high-frequency instruments before deciding.
Why is conversion slow, or failing outright?
Transcoding runs on your device and the whole file is read into browser memory. Long or high-bitrate material can exhaust it; cut the source into shorter pieces and process them separately.

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