In this guide
Decode the WAV, encode an MP3 at a suitable bitrate, then listen and compare the actual file size. MP3 is lossy and may add delay or padding, so keep the original WAV for editing and timing-sensitive work.
To convert WAV to MP3, open the WAV in a compatible audio converter or editor, choose MP3 and a bitrate, then export a new file. Saturalabs' free browser converter can prepare a supported short recording locally. Audacity and Apple Music on Mac offer desktop alternatives. Listen to the saved MP3 and keep the original WAV.
MP3 is a lossy format: the encoder discards some information to reduce the amount of data. Renaming a file from .wav to .mp3 does not perform that encoding.
Convert WAV to MP3 in your browser
- Choose the WAV. Open the WAV-to-MP3 converter and select a supported mono or stereo WAV up to five minutes and 50 MiB. WAV is a container; browser support depends on the encoding inside it.
- Select a bitrate. Choose 64, 96, 128, 192 or 320 kbps. Higher settings generally produce larger files and may retain more detail, but bitrate is not a guarantee of quality.
- Prepare and compare. The browser decodes at 48 kHz and a local worker encodes the MP3. The encoder may use a lower output sample rate at lower bitrates. Check the actual exported bytes against the original and any destination limit.
- Preview and download. Listen to the same file offered for download, including quiet details and the beginning and end. No account or audio upload is required. The tool does not copy tags or artwork, normalize levels or guarantee that the result is smaller.
The output must fit 50 MiB as well. If decoding fails, try a standard PCM WAV or a compatible desktop editor. Keep the source: this operation does not change the original file or provide a lossless MP3.
Convert WAV to MP3 with Audacity
- Import the WAV and listen to confirm you have the intended recording.
- Choose File → Export Audio, choose MP3 and configure the available bitrate options.
- Select the intended range and destination, export, then open the saved MP3 and check its duration and sound.
Audacity's export guide distinguishes exporting audio from saving an editable project. If you have multiple tracks, check which tracks and time range will be included before exporting.
Convert WAV to MP3 in Apple Music on Mac
Open Music and choose Music → Settings → Files → Import Settings. Select MP3 Encoder under Import Using. Select a supported song in the library and choose File → Convert → Create MP3 Version. Apple says the original and converted copies appear in the library; see its format conversion instructions.
How much smaller will the MP3 be?
For a fixed-bitrate MP3, a rough payload estimate is seconds × kbps × 1,000 ÷ 8. One minute at 192 kbps is about 1,440,000 payload bytes. A minute of 48 kHz, 16-bit stereo PCM contains about 11,520,000 payload bytes. Headers, encoder padding and metadata affect actual size, and a WAV may use a different rate, bit depth or encoding. Use the file size calculator for planning and check the finished file for the exact size.
Choose the right file for your next step
| Goal | Useful file | Check |
|---|---|---|
| Continue editing | Keep the original WAV or session files. | Rate, bit depth and timing required by the project. |
| Share a smaller listening copy | Make an MP3 at a suitable bitrate. | Actual size, quiet details and the destination's limits. |
| Return audio to video | Prefer a working format supported by the editor. | Sync at the beginning and end; MP3 may introduce delay or padding. |
If you received an MP3 rather than the original WAV, converting it to WAV cannot restore earlier lost information. The MP3-to-WAV guide covers that direction, and the format comparison explains source history and delivery choices.
Common questions
Is WAV-to-MP3 conversion lossless?
No. MP3 is lossy, even at a high bitrate. Listen to the output in the intended context and retain the original.
Why is my MP3 larger than expected?
Bitrate, duration, encoder framing and padding determine the output size. The source WAV might already use a compressed encoding. Compare actual bytes instead of assuming every WAV-to-MP3 conversion saves space.
Can I convert an entire album at once?
The local utility processes one supported short file at a time. Use an appropriate desktop batch workflow for longer files or multiple tracks, and verify each output.