What is the difference between WAV and MP3?

WAV stores uncompressed PCM audio — the raw samples, with nothing discarded. Quality is perfect and files are large: roughly 10MB per stereo minute at CD quality. It is the standard working format for recording and editing. MP3 is a lossy audio format that discards detail the ear is least likely to notice, producing files roughly a tenth the size of WAV. Newer codecs are more efficient, but nothing matches MP3 for sheer playback compatibility.

Will I lose anything converting WAV to MP3?

Yes — MP3 is lossy, so some detail is discarded permanently in exchange for a much smaller file. A WAV is uncompressed, so expect the file to shrink to roughly a tenth of its size. At sensible bitrates most people cannot hear the difference on ordinary playback equipment. Keep your WAV original as the master, because you cannot get back what the encoder throws away.

Anything to watch out for with MP3?

192kbps is the practical sweet spot for music; 128kbps is fine for speech; below 96kbps artefacts become audible on most material. MP3 cannot represent true gapless playback without encoder-specific padding metadata, which is why some albums click between tracks.

What bitrate should I use?

For music, 192kbps MP3 or 128kbps Opus is the point where most people stop hearing a difference from the source. For speech and podcasts you can go much lower — 96kbps MP3 or 64kbps Opus is transparent for voice. Going above 256kbps on a lossy codec mostly just makes the file bigger.

What should I know about starting from WAV?

WAV is raw PCM with no standard tagging scheme, so artist and album metadata is usually absent before the conversion even starts. More broadly: WAV stores uncompressed PCM samples — the raw digital representation of the waveform, with nothing thrown away. A stereo CD-quality minute is about 10MB.

When is MP3 the right choice?

MP3 suits: maximum compatibility — anything with a speaker plays MP3; podcasts, audiobooks and spoken word; sharing where you cannot control the recipient's player. It is the wrong choice when archival, since the discarded detail cannot be recovered.

Is there a file size limit?

No hard limit — the constraint is your browser's memory. Files under 50MB convert in a few seconds. Larger files work but take longer, and a browser tab typically has 250-500MB to play with, so very large batches are better split into smaller groups.

Does this work on mobile?

Yes. The drop zone falls back to your phone's file picker, and the conversion runs on-device exactly as it does on desktop. Large files are slower on a phone because there is less CPU and memory available, but nothing about the workflow changes.

Convert WAV to MP3

Shrink a raw WAV recording to about a tenth the size, in the format every device on earth will play. Free, in your browser, no upload.

Drop audio files to convert

WAV, MP3, M4A (AAC), AAC, OGG, Opus, FLAC

Files stay on your device. Open DevTools' Network tab to verify.

Bitrate192 kbps

MP3/AAC/Opus and decoding compressed input use browser WebCodecs; available in modern browsers only.

Overview

Why convert WAV to MP3

WAV stores raw samples with nothing discarded, which is why a stereo minute costs about 10MB — fine while you are recording and editing, impractical for sharing or storing. Converting to MP3 trades detail you are unlikely to hear for a file a fraction of the size. WAV also has no standard tagging scheme, so artist and album metadata is usually absent to begin with.

Comparison

WAV vs MP3: what actually differs

WAV compared with MP3 across encoding, fidelity, file size and support.
Attribute	WAV	MP3
Full name	Waveform Audio File Format	MPEG-1 Audio Layer III
Encoding	Binary	Binary
Fidelity	Lossless — bit-for-bit original samples	Lossy — detail is permanently discarded
Typical size	Very large — about 10MB per stereo minute at 44.1kHz/16-bit	About 1MB per minute at 128kbps; 1.5MB at 192kbps
Support	Universal. Every operating system, editor and player reads WAV.	Universal, including hardware too old for anything newer.

How to

How to convert WAV to MP3

01
Drop your WAV file
Drag one or more WAV files onto the drop zone above, or click to browse. Files stay on your device — there is no upload step.
02
Convert to MP3
convert.now parses the WAV and writes it out as MP3 in a Web Worker, so the page stays responsive even on large files. Nothing is sent anywhere.
03
Download the result
Download the MP3 file, or a zip of all of them for a batch. Filenames are preserved, with the extension changed to .mp3.

Why here

Why convert.now

Private
Files stay in your browser. No upload step. Nothing for anyone to see.
Fast
No queue, no upload wait. Conversion starts the moment you drop a file.
Free
No ads. No file-count limit. No sign-up wall. Just the converter.

FAQ

WAV to MP3: common questions

No. The WAV to MP3 conversion runs entirely in your browser. Files never leave your device, and there is no server involved in the conversion at all. Open DevTools' Network tab and run a conversion if you want to confirm it — you will see the page and its code load, and no request carrying your file.

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Last updated 27 August 2026

Why convert WAV to MP3

WAV vs MP3: what actually differs

How to convert WAV to MP3

Drop your WAV file

Convert to MP3

Download the result

Why convert.now

WAV to MP3: common questions

Related WAV converters