WAV to MP3

Convert WAV (and other audio your browser can play) to MP3 with the LAME encoder. Choose the bitrate, stereo or mono, batch convert and download as ZIP.

Audio ToolsProcessed locallyNo account needed

Drop WAV files here

Converted to MP3 on this device. M4A, OGG and FLAC also work if your browser can play them.

WAV, X-WAV, AUDIOS, M4A, AAC, OGG, FLACUp to 300MB100% Private

How to use WAV to MP3

Simple steps to get your task done in seconds

Add WAV files

Drop one or more WAV recordings.

Pick quality

192 kbps suits most listening; 320 kbps for the best quality.

Download MP3

Preview and download each file, or all of them as a ZIP.

How In-Browser WAV to MP3 Audio Encoding Works

ZapPebble converts audio tracks directly inside your browser without uploading heavy media files to external cloud transcoding servers. The tool uses your browser native Web Audio API (AudioContext.decodeAudioData()) to decode compressed audio frames into raw Float32 pulse-code modulation (PCM) audio samples. It then encodes the PCM stream into an MP3 byte stream using a client-side WebAssembly build of the LAME encoder (@breezystack/lamejs).

Audio Parameter	Supported Values	Technical Details
Input Formats	MP3, WAV, AAC, M4A, OGG, FLAC	Decoded using browser native hardware audio codecs; up to 300 MB per file.
Sample Rates	44.1 kHz (CD), 48 kHz (Video), 22.05 kHz, 16 kHz	44.1 kHz is standard for music; 16 kHz or 22.05 kHz reduces file size for voice memos.
Channel Configuration	Stereo (2 channels) or Mono (1 channel)	Mono cuts uncompressed audio data size by 50% for speech recordings.
Bitrate Options	128, 192, 256, 320 kbps CBR	192 kbps is transparent for most listeners; 320 kbps offers studio fidelity.

Practical Example: Compressing Studio Master Recordings

The Scenario

You recorded a 5-minute musical track session.wav weighing 52 MB. You need to email it to a collaborator whose email client limits attachments to 15 MB.

Settings: Channels = Stereo · Sample Rate = 44,100 Hz · Bitrate = 192 kbps.

Transcoding Result

The file is decoded in browser RAM with real-time progress tracking.
The resulting MP3 weighs only 7.1 MB (86% reduction) while preserving full acoustic frequency range.
Direct download triggers immediately without server queuing or conversion wait times.

Important Audio Considerations & Memory Limits

Uncompressed WAV Size

Uncompressed 44.1 kHz 16-bit stereo WAV audio consumes ~10 MB per minute. Converting long multi-hour recordings to WAV requires sufficient device RAM.

Batch Transcoding & ZIP

You can drop multiple voice memos or tracks at once. ZapPebble processes them in sequence and bundles all converted files into an uncompressed ZIP archive.

Audio Privacy

Confidential interview recordings, musical demos, and private voice messages are processed exclusively inside your browser's Web Audio memory buffer. Zero audio bytes are uploaded.

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