WAV to MP3 Converter
Processed locally in your browser — nothing is uploaded.
Quick answer
WAV files are uncompressed PCM audio — pristine, but enormous, often ten times the size of an equivalent MP3. Converting WAV to MP3 compresses that audio down to a fraction of the size, at a bitrate you choose. This tool does it in your browser with ffmpeg.wasm, so your WAV is never uploaded. The engine is a one-time ~32 MB download on first use; every conversion after that is local and instant.
How to wav to mp3 converter
Add your WAV file
Drag a .wav file in or browse for it. The tool reads the PCM audio and shows the file ready to convert.
Set the MP3 bitrate
Choose how much to compress: 128 kbps for speech, 192 kbps as a music default, or 320 kbps for the highest-quality MP3.
Convert and download
The MP3 is encoded on your device — typically a small fraction of the WAV’s size — and offered straight back for download.
Why are WAV files so large?
A WAV file stores raw, uncompressed PCM: every single audio sample written out in full, with no attempt to save space. CD-quality stereo runs at 44,100 samples per second, 16 bits each, across two channels — that is about 10 MB for every minute of audio, regardless of what the audio actually contains. A three-minute song is roughly 30 MB as WAV. MP3 compresses that same music intelligently, discarding detail your ear is unlikely to miss, and lands the file at a tenth of the size or less.
| Format | Bitrate | Approx. size | Quality |
|---|---|---|---|
| WAV (PCM) | 1,411 kbps | ≈ 30 MB | Perfect / uncompressed |
| MP3 | 320 kbps | ≈ 7 MB | Maximum MP3 |
| MP3 | 192 kbps | ≈ 4.3 MB | Very good (default) |
| MP3 | 128 kbps | ≈ 2.9 MB | Good (fine for voice) |
The size drop is why WAV is almost never used for distribution: it is a working and mastering format. Once a recording is finished, converting to MP3 is how you make it practical to email, upload or carry on a phone.
Which bitrate should you pick?
Match the bitrate to the material. Spoken-word WAVs — interviews, narration, voice memos — sound clean at 128 kbps because speech is a simple signal. Music deserves 192 kbps as a default, and 320 kbps if it is going into a library you care about or may re-encode later. Going above 320 is impossible: it is the MP3 format ceiling.
Got a WAV that came from a video?
If your WAV was exported from footage and you actually want the sound straight from the video, you can extract audio from a video directly and skip the WAV middle-step entirely. Otherwise, convert your existing WAV here as normal.
Is my WAV uploaded anywhere?
No — and with WAV files that matters more than usual, because they are large and often contain unreleased studio recordings. The conversion runs through ffmpeg.wasm in your browser tab: the file is read, encoded on your CPU, and returned locally, with no network transfer of the audio. Check the Network tab in DevTools and you will see nothing uploaded after the one-time engine download.
Related audio tools
Need to go the other way for editing? MP3 to WAV unpacks an MP3 back to PCM. To archive the WAV losslessly instead of compressing it, WAV to FLAC halves the size with zero quality loss. And the audio compressor is the tool to reach for when you just want a smaller file, not a new format.
Your files never leave your device
Processed locally in your browser — nothing is uploaded. You can verify it yourself: open your browser’s developer tools, watch the Network tab, and use the tool — no upload request is ever made.
Frequently asked questions
How much smaller will my MP3 be than the WAV?
Typically 5–10× smaller. A 30 MB WAV becomes roughly 3 MB at 128 kbps or about 7 MB at 320 kbps — the exact size depends on the bitrate you choose and the length of the audio.
Will I hear a difference after converting WAV to MP3?
At 192 kbps or higher, most people cannot tell the MP3 from the WAV on ordinary headphones or speakers. Lower bitrates like 128 kbps are transparent for speech but can be noticeable on complex music.
Can I convert WAV to MP3 without losing quality?
MP3 is inherently lossy, so some data is always discarded. To keep every bit of the WAV while still shrinking it, convert to FLAC instead, which is lossless.
Does the tool keep my WAV’s sample rate?
Yes. The MP3 preserves the source sample rate (typically 44.1 or 48 kHz) unless you choose otherwise, so playback speed and pitch are unchanged.
Why is my WAV file so big in the first place?
WAV stores uncompressed PCM — every sample in full — so it uses about 10 MB per minute of CD-quality stereo regardless of the content. That is exactly what MP3 compression removes.
Can I batch-convert many WAV files?
Yes. Add several files and each is encoded locally. There is no upload queue and no per-file limit beyond your device’s memory.
Is my audio really private?
Yes. Processing is entirely in-browser with ffmpeg.wasm; nothing is uploaded. You can verify no network request carries your file in the DevTools Network tab.