WAV to MP3 Converter
Uploaded WAV files are decoded and re-encoded with LAME, which is always asked for 192 kbps constant bitrate, and title, artist and album tags carry over as ID3. There is no bitrate selector, so if your workflow requires 320 kbps you will need a desktop encoder instead.
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What you get from a WAV to MP3 conversion
WAV is a container for raw, uncompressed PCM. That is exactly what you want while recording and editing, and exactly what you do not want when you need to email a mix, upload a podcast episode, or load a few hundred tracks onto a phone. Standard CD-quality stereo PCM runs at 1,411 kbps, which is around 10 MB for every minute of audio, and WAV also has no agreed-on tagging standard, so the artist and title fields often arrive empty or get ignored by players.
Here, ffmpeg decodes the PCM and hands it to LAME, which is always asked for 192 kbps CBR. There is no quality slider, no VBR mode and no 320 kbps option. The one exception is a low-sample-rate source: LAME clamps the rate itself, so a 22.05 kHz WAV lands near 160 kbps and an 8 kHz voice recording near 64 kbps. For normal 44.1 and 48 kHz material, 192 kbps CBR is a conservative middle ground that plays on practically any MP3 decoder, including older car head units and hardware players that struggle with variable bitrate files.
What carries over: title, artist and album are written into the output as ID3 tags, and chapter markers survive if the source had them. The sample rate is kept up to 48 kHz, so 44.1 kHz and 48 kHz sessions come through unchanged, while a 96 kHz master is resampled down to 48 kHz. More than two channels are folded to stereo, and any embedded image is dropped, so there is no cover art in the MP3.
This is a one-way, lossy step: the encode discards audio data to reach its target bitrate and nothing recovers it later, so keep your WAV masters. The people who use this page are podcasters shrinking an interview before upload, musicians sending rough mixes to collaborators, and anyone clearing space after a long recording session on Windows or Mac without installing an audio editor for one file.
How to convert a WAV file to MP3
- Check the size of your WAV before you start. A guest upload is capped at 50 MB per file, which at CD quality is roughly five minutes of stereo audio; a free account raises that to 100 MB, Plus to 200 MB and Pro to 1 GB. For a long session recording, export a trimmed version or sign in first.
- Drag your WAV files into the upload box, or click it to browse. You can send several files in one batch, up to 10 without an account.
- Start the conversion. Files upload over HTTPS and are processed on our servers; for a typical multi-megabyte WAV the encode itself finishes within a few seconds of the upload completing.
- If a file fails with "Invalid data found when processing input", the WAV is truncated or is not really PCM audio. Re-export it from your editor or re-download it, then try again.
- Download each MP3. The file keeps its original base name with the .mp3 extension, and the download link works for about four hours.
- Check the tags in your player. If title, artist and album were empty in the WAV, they will be empty in the MP3 too; fill them in with any ID3 tag editor.
How this converter handles WAV input
- ffmpeg 5.1 with LAME, asking for 192 kbps constant bitrate on every file so playback is predictable on old hardware players.
- Reads 8-bit, 16-bit, 24-bit and 32-bit PCM WAV; the decoder identifies the stream by content rather than by the extension, so odd exports from recorders usually still go through.
- Carries title, artist and album across as ID3 tags, and keeps chapter markers when the source file has them.
- Keeps the sample rate up to 48 kHz and keeps mono as mono rather than padding it to stereo; surround sources are folded down to two channels.
- Converts complete files only, with no trimming, normalization or noise processing applied along the way, so what you hear is the original mix at a lower bitrate.
- Accepts mixed batches: FLAC, M4A, AIFF, OGG, WMA, AAC, CAF and other supported audio files can be dropped on this page alongside your WAVs and all come back as MP3.
Video Tutorial
Watch this step-by-step tutorial to learn how to convert WAV files to MP3 format online for free using MiConvert.com. No software installation required.
WAV to MP3 questions
Can I convert WAV to MP3 at 320 kbps?
Not here. LAME is always asked for 192 kbps constant bitrate and there is no setting to change it; on a low-sample-rate source the encoder clamps the rate lower still. If 320 kbps is a requirement, use a desktop encoder such as Audacity with the LAME export options, or ffmpeg locally with -b:a 320k.
Why does my file fail with "Invalid data found when processing input"?
This is the most common failure on this page. It means the decoder reached the end of the data without finding a valid audio stream: usually a WAV whose upload or download was cut short, a zero-length export, or a file with a .wav extension that is actually something else. Re-export or re-download the file and convert it again.
My WAV is larger than the upload limit. What can I do?
Uncompressed audio hits the limits quickly. A free account lifts the per-file cap to 100 MB, Plus to 200 MB and Pro to 1 GB. For single files above 1 GB, audio is one of the engines covered by the one-off paid large-file conversion, which is offered on the page when you pick such a file and requires a signed-in account; the result is emailed as a link. Otherwise, split or trim the recording before uploading.
Will the album art in my file be kept?
No. Picture streams are removed during conversion, so the MP3 arrives without cover art even if the source carried an image. Add artwork afterward in a tag editor, iTunes, or your music library software.
What happens to a 24-bit or 96 kHz WAV, and how much smaller will the MP3 be?
It converts, but it is no longer hi-res audio afterward. MP3 has no bit-depth concept, so 24-bit information is folded into the lossy encode, and a 96 kHz source is resampled to 48 kHz because that is the highest rate MP3 supports. On size: CD-quality stereo PCM is 1,411 kbps against 192 kbps for the MP3, so the drop is substantial, while a mono or low-sample-rate WAV starts much lower and the encoder may clamp the bitrate, so the saving is smaller. If you want to shrink a hi-res master while keeping bit depth and sample rate, convert it to FLAC instead.
Can I convert several WAV files at once, or turn the MP3 back into WAV?
You can drop up to 10 files in one batch as a guest, 25 on Plus and 50 on Pro, and each file is converted separately with its own download. Converting the MP3 back to WAV is possible with our MP3 to WAV page, but it rebuilds a PCM file from the lossy audio; it does not restore what the MP3 encoder discarded.
Is the conversion private, and how long do you keep my audio?
The work happens on our servers rather than in your browser, over an HTTPS connection. Your uploaded WAV is deleted as soon as the job ends, and the finished MP3 stays available through its random download link for about four hours before being deleted automatically. File names, sizes and conversion outcomes are recorded in our logs, and signed-in users also see the conversion in their account history.