Why convert WAV to MP3?
This is the conversion that actually makes sense in the direction it's going. WAV is superb for working with audio and impractical for sharing it — a few minutes of stereo audio runs to tens of megabytes, which is enough to bounce off email limits and clog cloud storage. MP3 compresses that same audio to a fraction of the size while staying perceptually close to the original for ordinary listening, which is why it remains the default format for distribution nearly three decades after its introduction.
The key discipline is where in your workflow you do it. MP3 is a delivery format, not a working format. Edit in WAV, export to MP3 once at the end.
Choosing a bitrate
Bitrate is the main quality control, measured in kilobits per second, and choosing it well matters more than any other setting.
320 kbps is the maximum standard MP3 bitrate. For music you want to sound as close to the source as MP3 allows — a demo sent to a label, a track for a portfolio — this is the right choice. 192–256 kbps is a sensible middle ground for most music distribution, meaningfully smaller with little perceptible difference on typical playback systems. 128 kbps is the old web default; acceptable for casual listening but audibly compromised on cymbals, reverb tails, and anything with complex high-frequency content.
For spoken word — podcasts, interviews, voice memos, narration — you can go considerably lower without harm. Speech is far less demanding than music, and 96 kbps or even 64 kbps mono produces perfectly intelligible results at a small fraction of the size. Encoding a solo voice recording at 320 kbps stereo is simply wasting storage.
Mono versus stereo
An easy and frequently overlooked saving: if your source is a single voice recorded on one microphone, it contains no real stereo information. Exporting it as mono halves the file size with zero quality cost. Many voice recordings are stereo files containing two identical channels — pure waste. Reserve stereo for music and for recordings where spatial information genuinely exists.
Don't convert MP3 to MP3
Worth stating plainly, because it's the most common way people damage audio without realising. Each MP3 encode discards information. Encoding an already-compressed MP3 again — even at a higher bitrate — compounds the damage, and raising the bitrate cannot recover anything; it only makes a larger file containing the same degraded audio plus new artefacts.
Always export to MP3 from your original WAV or other lossless master. If you need a different bitrate later, go back to the master and re-export rather than converting an existing MP3. And keep that master — once you've discarded the WAV, that quality ceiling is permanent.
Where MP3 is still the right answer
Despite newer formats like AAC and Opus being technically superior at equivalent bitrates, MP3's advantage is universality. It plays on essentially every device, browser, car stereo, and piece of software ever made. When you're sending a file to someone whose setup you don't control — a client, a collaborator, a venue — that reliability is usually worth more than a marginal efficiency gain.
Choose AAC or Opus when you control the playback environment and want better quality per kilobyte. Choose MP3 when it just needs to work everywhere, first time.
How the conversion works
This tool runs a WebAssembly build of FFmpeg directly inside your browser tab. The first conversion on a page load downloads that engine (about 25–30 MB), so there's an initial wait; every conversion afterwards is fast. Your WAV is decoded and re-encoded entirely on your own device and is never uploaded — relevant when the material is unreleased music, a client's recording, or a confidential interview.