Turn a bulky uncompressed WAV into a compact MP3 that is far easier to email, publish as a podcast or fit under an upload limit.
Converting WAV to MP3 turns a bulky uncompressed recording into a much smaller file that still sounds close to the original for everyday listening. The trade is permanent: the MP3 discards audio data the WAV held, so keep the WAV as your master and treat the MP3 as the copy you share.
Transfers use HTTPS, and files converted on the free tier are deleted within 24 hours, so the result is not a long-term archive. Quality depends on the source file, so open the MP3 file once before you share it.
WAV (Waveform Audio File Format)
An uncompressed audio container from Microsoft and IBM that normally stores raw PCM samples exactly as recorded. CD-quality stereo takes roughly 10 MB per minute, and the format is the standard working file in recording and editing software.
MP3 (MPEG-1 Audio Layer III)
A lossy audio format that shrinks recordings by removing sound the ear is least likely to notice. A typical file is a fraction of the uncompressed size, at the cost of detail that can never be restored.
A 15-second spoken-word clip saved as WAV, converted on indox.org
Uncompressed recordings are bulky, so check the size limit the upload box shows before you add a file. Signing in raises it, and paid plans raise it further. Long WAV files stored in Dropbox or Google Drive can be imported from there.
Add several WAV files together, such as the tracks of an album or the takes from one session, and each gets its own MP3. A progress bar shows the job, and you can cancel it if the wrong take went in.
Download the MP3, share it with a link or convert it again to another format. The loss is permanent and free-tier files are deleted within 24 hours, so indox is not where the recording lives: your WAV stays the copy you edit from.
Drop the WAV on the box, choose it from your device, or import it from Dropbox, Google Drive or a URL. Add several recordings together if you have more than one.
Make sure MP3 is set as the output format on the converter, then start. A progress bar follows the job, and you can cancel it.
Save the MP3 and listen to the quiet passages and the cymbals, where lossy compression shows first. If it is a loop, check the join: MP3 adds a few milliseconds of silence at each end.
You add an uncompressed WAV and get back an MP3 that takes a fraction of the space and opens on virtually any player. Nothing is installed, and a single file needs no account. The recording travels over HTTPS and is processed on indox infrastructure. What you do not get is a lossless copy: MP3 discards audio data for good, so the WAV you started with is still the one to keep.
The upload box shows the live size limit before you add a file. Signing in raises it, and paid plans raise it further.
WAV in, MP3 out. Pick another output on the converter if you need a different format.
Files are encrypted in transit over HTTPS and processed on indox infrastructure.
Free-tier files are deleted automatically within 24 hours after the job finishes.
| What you see | Why | What to do |
|---|---|---|
| A short silence at the start or end, and a loop no longer joins cleanly | MP3 encoders add a delay and padding. The encoder delay is stored in a Xing/LAME frame that gapless players can read | Use a gapless player, or keep the WAV for anything that has to loop |
| Cymbals and quiet detail sound duller | Perceptual coding simplifies the parts of the sound the ear notices least | Treat the MP3 as the copy to share and keep the WAV for editing and listening closely |
| Converting the MP3 back to WAV does not bring the detail back | The discarded audio data is gone for good | Always keep the original WAV |
| Compared on | WAV | MP3 |
|---|---|---|
| What it is | A wrapper format that can hold an audio bitstream plus other data chunks | An audio encoding, MPEG Layer III |
| Compression | Commonly holds uncompressed LPCM audio | Perceptual coding, which is lossy |
| Size | CD-quality LPCM is the baseline | A 128 kbit/s MP3 is about one eleventh of that |
| Tags | Broadcast WAVE variants are standard for preservation work | ID3, a separately specified structure |
Facts checked on October 16, 2026
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Yes. MP3 is lossy, so the encoder permanently removes parts of the sound it judges inaudible. At higher bitrates most listeners cannot tell the result from the WAV on ordinary speakers or earbuds. At low bitrates the loss becomes audible as dull cymbals, watery sibilance and a smeared stereo image, especially on dense music.
Typically between four and eleven times smaller, depending on the MP3 bitrate. CD-quality WAV runs at 1,411 kbps, about 10 MB per minute. A 128 kbps MP3 uses about 1 MB per minute and a 320 kbps one about 2.4 MB. A three-minute song therefore falls from around 30 MB to somewhere between 3 and 7 MB.
Yes, if the recording matters to you. The WAV is the only copy with all the original audio, and anything you make from the MP3 later, including another MP3, starts from a degraded source. Keep the WAV for editing, remixing and future exports, and hand out the MP3 for listening.
It comes from the MP3 format itself, not from a fault in your file. Encoders process audio in fixed-size frames and add a short delay at the start plus padding at the end, usually a few tens of milliseconds in total. For songs it is unnoticeable. For loops and gapless albums, a format such as WAV or FLAC is the safer choice.
Not technically, but for listening it is very close. That bitrate is at the high end of MP3 quality, yet it is still not identical data, so it remains unsuitable as a master, and it gains nothing if the WAV itself came from a lossy file.
Not on this page. The converter passes no bitrate setting, so the MP3 encoder uses its own default. If you need a specific bitrate for a podcast host or a player, keep your WAV and encode it with the tool that host recommends.
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