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Convert WAV to MP3

Convert WAV to MP3 directly in your browser with local processing and no audio upload to a server.

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WAV file

WAVMP3
Your audio stays on your device.

Drop your WAV file here

Or choose it from your device.

Conversion runs locally in your browser with Bethemesh’s shared audio engine.

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How does this tool work?

Convert a WAV file to MP3 directly in your browser to create a smaller, widely compatible copy while keeping the WAV original when you still need a lossless source.

The engine reads the audio stream contained in the WAV and encodes it as MP3 with FFmpeg/WASM. WAV is commonly used for uncompressed PCM, while MP3 uses lossy compression, so file size usually falls substantially but the conversion should not be treated as reversible. Output is locked to MP3 at 192 kbit/s. WAV can contain several audio encodings; a recognized extension does not guarantee that every variant is decodable. A typical PCM source usually becomes smaller through lossy compression. Samples are not simply copied into another wrapper, and the MP3 is not a faithful archive of the master. This page exposes no bitrate, sample-rate or channel controls; use audio compression for a custom bitrate. Editing markers, Broadcast WAV metadata and artwork are not guaranteed in the resulting MP3.

How to use this tool

  1. Open the finished WAV

    Select the edited version intended for distribution.

  2. Make the 192 kbit/s copy

    Start MP3 encoding and wait for processing to finish.

  3. Compare before publishing

    Check peaks and quiet sections, then keep your WAV.

Convert WAV to MP3 — Calculation reference

S = t × f × C × b / 8

S ≈ 1000 × R × t / 8

S
PCM payload in bytes, excluding headers
t
Duration in seconds
f
Sample rate in Hz
C
Channel count, dimensionless
b
Bits per sample
R
Bitrate in decimal kbit/s

Use cases

Publish edited speech

Reduce a narration WAV for MP3 delivery.

Distribute a demo

Share a listening version without sending the PCM master.

A smaller attachment

Fit a long WAV into a transfer limit when the resulting quality is suitable.

Examples

One minute of stereo at 48 kHz

The data ratio is about 8 in this particular case. It is not a universal reduction promise for every WAV.

Input

16-bit PCM WAV: 60 s, 48,000 Hz, 2 channels

Result

11,520,000 PCM bytes; estimated MP3 1,440,000

A thirty-second segment

192,000 × 30 ÷ 8. Duration is approximately preserved; output adds its own headers and encoding delay.

Input

30 s, MP3 destination at 192 kbit/s

Result

About 720,000 audio bytes

Tips and best practices

  • Complete effects before the final WAV-to-MP3 conversion.
  • Do not assume Broadcast WAV markers become MP3 chapters.
  • Unusual WAV encodings can remain unreadable despite the recognized extension.

Sources and references

Frequently asked questions

Is WAV-to-MP3 conversion reversible?

MP3 removes audio information. Converting the copy back to WAV does not recover the original samples.

Are all WAV files PCM?

No. WAV is a container for different encodings; the engine must decode the actual variant.

Is the WAV master altered during encoding?

Encoding creates an MP3 copy rather than replacing the WAV stored on your disk.

Which MP3 bitrate does this page use?

Encoding uses 192 kbit/s. To choose another rate, start with the WAV in audio compression rather than re-encoding an MP3 copy.

Why keep the WAV after converting?

MP3 is convenient for distribution, but encoding removes information. Retain the WAV for further editing or future delivery versions.

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