AUDIO GUIDES
How to Convert WAV to MP3: Bitrate, Size & Quality
Make an MP3 listening copy from PCM WAV. Compare bitrate and file-size examples, understand the 30 MiB input limit and check the downloaded result.
Convert WAV to MP3 when you need a smaller listening or sharing copy of a PCM recording. Open the WAV to MP3 converter, choose a bitrate and compare the export before saving it. Keep your WAV master: an MP3 is a lossy delivery copy, not a replacement for the original recording.
Check the WAV before choosing a bitrate
WAV is a container and does not always contain uncompressed audio. This tool accepts mono or stereo uncompressed PCM WAV, up to 30 MiB and ten minutes. A compressed codec inside a WAV container, a damaged header or additional channels may prevent import. Renaming an extension does not change the data inside.
The size and duration limits both apply. Three minutes of 44.1 kHz, 16-bit stereo PCM already contains about 31.75 decimal MB of audio data, slightly above the 30 MiB input limit before headers. If the source is too large, export a shorter section from your recording application first; this site's trimmer has the same input size limit.
Choose 128, 192, 256 or 320 kbps
Follow the recipient's specification when one exists. Otherwise, try 192 kbps first and compare 128 kbps if a smaller file is important. Higher settings give the encoder more data but cannot guarantee that every listener or recording benefits. Listen to consonants, cymbals, quiet details and reverberation rather than judging only the number.
The output is constant bitrate, so duration helps predict the audio payload. Start every comparison from the original WAV instead of re-encoding a previous MP3. The MP3 bitrate guide explains CBR, VBR and why bitrate is not a rating of the source recording.
A one-minute file-size example
| Format and settings | Payload | Use in a comparison |
|---|---|---|
| WAV, 44.1 kHz, 16-bit stereo | 10.584 MB | Keep the PCM master |
| MP3, 128 kbps | 0.96 MB | Try when size is a priority |
| MP3, 192 kbps | 1.44 MB | A starting point for listening tests |
| MP3, 320 kbps | 2.40 MB | More encoded data; still lossy |
PCM payload equals duration × sample rate × bit depth × channels ÷ 8 in bytes. MP3 payload is approximately duration × bitrate in kbps × 1,000 ÷ 8. These examples are not measured compression results. Actual output includes framing, headers and supported tags.
The tool reports MiB, where one MiB is 1,048,576 bytes; one decimal MB is 1,000,000 bytes. A receiving service may use either unit. Leave headroom beneath a strict limit and check the actual download. Use the audio file size calculator and file-size guide to plan an attachment.
Convert, listen and download
- Select the local PCM WAV and wait for its duration, sample rate and channels to be read.
- Choose an MP3 bitrate. If needed, add a fade-out in this export; otherwise leave it off to avoid an intentional level change.
- Create the MP3. The first import loads the audio engine, and the file is processed on your device.
- Compare the original and processed players. Check the opening and ending, not just one loud passage.
- Check actual size and duration, download, then open the saved file in the intended player. Save before selecting a new file or navigating away.
Settings and metadata that may change
A 48 kHz input exports at 48 kHz; other accepted rates export at 44.1 kHz. Mono remains mono and stereo remains stereo. There is no manual sample-rate selector, multichannel downmix or batch queue on this page. Basic title, artist and album tags are copied where supported, but do not assume that cue points, artwork or every WAV metadata field survives.
MP3 framing may produce a small difference in reported duration. Check a strict delivery requirement against the saved file. Converting it back to WAV does not undo the compression loss; the MP3 to WAV guide explains when that larger copy is useful.
When processing fails
Check PCM encoding, channel count and both input limits. Browser memory must hold decoded audio as well as the result. Keep this tab open and try a shorter source if the device cannot complete processing. There is no server fallback. See troubleshooting for playback and saving problems. If the source is M4A, use the M4A converter and its AAC/ALAC recording guide; if it is already MP3, use MP3 compression.