WAV to MP3 — Convert WAV Audio Files to MP3 in Your Browser
Convert WAV audio files to MP3 format. Configurable bitrate, constant and variable bitrate modes, runs entirely in your browser. No uploads, no signup.
Drop your WAV file here
or click to browse (max 50MB)
WAV and MP3 represent the two ends of the audio format spectrum. WAV is uncompressed PCM audio — every sample is stored as a raw number, and a 60-second stereo recording at CD quality (44.1 kHz, 16-bit) occupies 10.5 MB regardless of whether the recording is a symphony or a second of silence. MP3 compresses audio by discarding information the human ear cannot detect: frequencies masked by louder nearby frequencies, quiet sounds that directly follow loud ones, and stereo information that is identical in both channels. The result is a file roughly 10x smaller than the WAV source with no perceptible quality loss at standard bitrates.
The conversion settings that matter are bitrate and mode. Constant bitrate (CBR) allocates the same number of bits to every frame, which makes file size predictable but wastes bits on silence and starves complex passages. Variable bitrate (VBR) allocates more bits to frames that need them (a cymbal crash, a complex chord) and fewer to frames that do not (silence, a single sustained note). VBR produces better quality at the same file size, but CBR is still the safer choice when the downstream player is old or the MP3 will be streamed through a service that assumes a fixed bitrate. The bitrate number itself sets the quality ceiling: 128 kbps is audible-roughly-CD-quality for most music, 192 kbps is transparent for likely all listeners, and 320 kbps is indistinguishable from the source for all practical purposes.
For a final hand-off: if the destination is a podcast hosting platform, check their recommended settings — most prefer 128 kbps CBR mono for spoken word. If you need lossless audio compression (no quality loss, but smaller than WAV), convert to FLAC or ALAC with a different tool — MP3 is inherently lossy. If you need to convert the other direction (MP3 to WAV), note that the conversion restores the WAV container but not the audio information that was discarded during the original MP3 encoding.
How to use
Drop your WAV file
Drag one or more WAV files into the drop zone. The tool reads the WAV header to detect sample rate, bit depth, and channel count. Most standard WAV files (PCM, 8/16/24/32-bit, mono or stereo) are supported.
Choose MP3 encoding settings
Default is 192 kbps CBR (constant bitrate) — a good balance of quality and size for spoken word. Switch to 320 kbps for music, 128 kbps for podcast compression, or VBR (variable bitrate) for quality-adaptive encoding.
Download the MP3
Each file converts in seconds. The output MP3 includes basic ID3v1 tags if the source WAV contained LIST INFO metadata. Download individually or batch-download as a zip.
Frequently asked
Is the conversion lossless or lossy?
The conversion from WAV to MP3 is lossy. WAV stores uncompressed PCM audio — every sample is exactly as recorded. MP3 uses perceptual coding to discard audio information that human hearing cannot perceive, which reduces file size by roughly 90% at standard bitrates. The discarded information cannot be recovered.
What bitrate should I choose for voice recordings?
64-128 kbps is sufficient for spoken word (podcasts, audiobooks, voice memos). The human voice occupies a narrow frequency range and MP3 encodes it efficiently. 192 kbps is overkill for speech but a safe default if the recording includes background music.
Does the converter preserve stereo or multi-channel audio?
Stereo WAV files are preserved as stereo MP3. Multi-channel WAV (5.1 surround, 7.1) is downmixed to stereo because MP3's most common profiles are mono or stereo only. The downmix uses a standard ITU-R weighting.
Why is my MP3 file still large after choosing a low bitrate?
The bitrate sets the target for the audio data, but the MP3 container has a fixed overhead (frame headers, padding, ID3 tags) that is independent of the bitrate. For very short recordings (under 2 seconds), the overhead dominates and the file size does not scale linearly with bitrate.
Limitations
- No gapless encodingMP3 format inherently adds silence padding at the start and end of each file (the encoder delay and padding). This matters for gapless albums or podcast intros where two MP3 files are played back to back without a gap.
- No ID3v2 tag generationOnly basic ID3v1 tags (title, artist, album) are carried from LIST INFO chunks. ID3v2 tags (cover art, lyrics, extended metadata) are not generated. Add them afterwards with an audio tag editor.
- WAV formats beyond standard PCM may not convertFloat32 WAV, A-law and Mu-law compressed WAV, and WAV files with extensible format headers may fail silently. Re-export to standard PCM WAV from Audacity or a similar editor if the conversion produces a zero-length MP3.
Platform notes
- macOS
- macOS's `afconvert` can convert WAV to MP3 via `afconvert input.wav output.mp3 -d aac` (AAC) — native MP3 encoding requires a third-party encoder. The browser tool is the quickest route without installing LAME or FFmpeg.
- Linux
- FFmpeg (`ffmpeg -i input.wav -b:a 192k output.mp3`) is the CLI standard. The browser tool is the right pick for batch-converting voice memos from a chat window without touching the command line.
- Web
- Runs entirely client-side. No audio data ever leaves your browser. The conversion uses the LAME MP3 encoder compiled to WebAssembly.