Free Online Audio Converter — MP3, WAV, M4A & More

Audio Converter

Convert MP3, WAV, M4A, AAC, OGG, FLAC & more right in your browser. Resample, trim, fade, normalize & batch convert. 100% private.

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Drop audio files here or click to browse
Supports MP3, WAV, M4A, AAC, OGG, FLAC, WebM · batch & paste supported · files never leave your device
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Recent Conversions

How to Use the Audio Converter

  1. Add your audio. Drag and drop files onto the box, click to browse, or paste a copied file. You can add several files at once.
  2. Pick an output format. Choose MP3 for small, universal files or WAV for lossless quality.
  3. Fine-tune (optional). Adjust bitrate, sample rate, channels, volume, trim, fade in/out, or enable Normalize.
  4. Convert. Press Convert All (or convert a single file), preview the result, then download individually or as a ZIP.

What Is an Online Audio Converter?

An audio converter changes a sound file from one format to another — for example turning a bulky WAV recording into a compact MP3, or extracting a clean WAV from an M4A voice memo. The right format makes files smaller, more compatible with your devices, and easier to share.

This tool runs entirely inside your web browser using the Web Audio API and a built-in MP3 encoder. Because everything is processed locally on your own computer or phone, your files are never uploaded to a server. That means faster conversions, complete privacy, and no file-size caps imposed by an upload limit.

Beyond simple format changes, you can resample to a different quality, switch between mono and stereo, raise or lower the volume, trim silence from the start or end, add smooth fades, and normalize loudness — all before you download.

Common Use Cases

🎤 Shrink podcasts & voice notesConvert WAV or M4A recordings to MP3 to cut file size dramatically for email and uploads.
🎧 Universal playbackTurn OGG, FLAC or AAC into MP3 so files play on any phone, car stereo or old device.
🎵 Studio-ready WAVExport lossless WAV for editing in audio software or for high-quality archiving.
✂️ Trim & fade clipsCut intros, remove dead air, and add clean fade-ins and fade-outs in one step.
🔊 Fix loudnessNormalize quiet recordings to a consistent, comfortable listening level.
📱 Voice & telephonyDown-sample to 8–16 kHz mono for IVR systems, transcription or tiny voice files.

Why Choose This Audio Converter

  • 100% privateFiles are processed in your browser and never leave your device.
  • No uploads, no waitingNothing to send to a server, so even large files convert quickly.
  • Batch conversionAdd many files and convert them all, then download as a single ZIP.
  • Full editing controlsBitrate, sample rate, channels, volume, trim, fades and normalize.
  • Built-in previewListen to the converted result and see its waveform before you save.
  • Free & unlimitedNo sign-up, no watermark, no file limit, no hidden cost.
  • Works everywhereRuns on desktop and mobile in any modern browser, with dark mode and fullscreen.
  • Lossless optionExport pristine 16-bit WAV when quality matters most.

Frequently Asked Questions

Are my audio files uploaded anywhere?
No. All conversion happens locally in your browser using the Web Audio API and a built-in encoder. Your files never touch a server, which keeps them completely private.
Which formats can I convert?
You can load almost any common audio your browser can read — MP3, WAV, M4A, AAC, OGG, FLAC, Opus, WebM and AIFF. Output is available as MP3 (with selectable bitrate) or lossless WAV.
Is there a file size limit?
There is no fixed limit because there is no upload. Very large files use more of your device's memory, so on older phones extremely long recordings may be slower to process.
What is the difference between MP3 and WAV?
MP3 is compressed, producing small files ideal for sharing and streaming. WAV is uncompressed and lossless, giving the best quality at a much larger size — best for editing or archiving.
What does "Normalize" do?
Normalize raises a recording's overall level so its loudest peak sits just below maximum, making quiet files louder and more consistent without distortion.
Can I convert several files at once?
Yes. Add as many files as you like, choose your settings, click Convert All, then download each file or grab them all in one ZIP.
Will converting reduce audio quality?
Converting to WAV preserves quality. Converting to MP3 uses lossy compression, but at higher bitrates such as 256 or 320 kbps the difference is very hard to hear.

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