WAV to MP3

A 5-minute WAV export from Audacity, GarageBand or a field recorder weighs about 50 MB — too big for most email attachments, WhatsApp and many upload forms. The same audio as a 192 kbps MP3 is around 7 MB and sounds the same to nearly everyone.

This converter encodes WAV to MP3 in your browser using lamejs, a JavaScript port of the LAME encoder that powers most MP3 software. Choose a bitrate from 48 to 320 kbps, optionally resample or mix to mono, and convert up to 20 files at once.

Nothing is uploaded, so there's no wait while a 500 MB recording crawls up to a server — encoding starts as soon as you click.

This is the tool for the last step of a recording workflow: you have finished editing in lossless WAV and now need a small, universally playable copy to send, publish or archive for listening. Keep the WAV master and share the MP3.

How It Works

1. Add WAV files — 8, 16, 24 or 32-bit PCM and 32-bit float WAVs are read by the browser's decoder.
2. Choose MP3 settings — bitrate (CBR 48–320 kbps), sample rate and stereo/mono. Files at unusual sample rates are resampled to 44.1 kHz automatically, because MP3 only supports specific rates.
3. Encode — audio is fed to the LAME encoder in 1,152-sample frames with a progress indicator. Cancel at any time; download files singly or as a ZIP.

Compatibility & Support

Supported Input → Output Formats

• Input: .wav (PCM 8/16/24/32-bit, IEEE float), mono or stereo
• Output: .mp3, constant bitrate 48–320 kbps, 16–48 kHz
• Channels: stereo or mono (multichannel WAVs are mixed down)

Unsupported Formats

This tool creates constant-bitrate (CBR) MP3s. Variable bitrate (VBR) can be slightly more efficient, but CBR is what podcast hosts, broadcast systems and older car stereos handle most reliably, and its file size is predictable: bitrate × duration. Surround (5.1) WAV files are mixed to stereo or mono — MP3 has no surround mode. Broadcast WAV metadata (BWF timecode, markers) is not carried into the MP3. ADPCM-compressed WAVs from some voice recorders may not decode in every browser; if yours fails, try Chrome.

File Size Limits

Up to 20 files per batch and 300 MB per file. Audio is decoded to uncompressed samples in memory, so a one-hour stereo recording needs roughly 1.3 GB of RAM while it is processed. On phones, split long recordings or convert them one at a time.

Who Should Use This Tool?

• Students: A media student converts a 20-minute WAV podcast assignment to 128 kbps MP3 so it fits the course portal's 50 MB limit.
• Freelancers & Designers: A voice-over artist sends clients 192 kbps MP3 previews for approval and keeps the 24-bit WAV masters for final delivery, so revisions never start from a compressed copy.
• Office Professionals: A training coordinator converts WAV recordings of internal webinars to 64 kbps mono MP3 for the company intranet.
• Developers: A developer converts WAV game audio to MP3 for a web build where download size matters.

Why This Tool Beats the Alternatives

• Starts encoding immediately — no upload of huge WAV files.
• Private: nothing is stored on a server.
• Full bitrate range, not just one "high quality" preset.
• No length limit, account or watermark.
• Handles float and 24-bit WAVs from modern recorders.

Pro Tips

• Choose 192 kbps for music, 128 kbps for podcasts, 64–96 kbps mono for voice memos. Podcast platforms such as Spotify and Apple Podcasts accept all of these.
• Normalize or edit in WAV before converting — each MP3 re-encode loses a little quality, so treat the MP3 as the final delivery copy and go back to the WAV for any later changes.
• If an upload limit is strict, the Audio Compressor has presets tuned for size.

Drop your WAV files above, choose a bitrate, and download compact MP3s.