Convert Audio to MP3 Free Online

Convert WhatsApp voice notes, podcasts, and any common audio file to MP3 in your browser. Fast WebCodecs path for WAV/M4A/OGG; automatic fallback for AMR, FLAC, and other formats.

Choose Audio file

Tap to browse. Converts to MP3 in your browser. Nothing is uploaded.

Save directly to disk

Pick a save location before converting. Large files stay out of browser memory.

How to Convert Audio to MP3 in Your Browser

Choose your audio file: Drop a WhatsApp voice note, M4A, WAV, OGG, AAC, AMR, or any common audio file.
Transcode locally: GrepCut encodes to 192 kbps MP3 on your device. WAV, M4A, and OGG use the fast Mediabunny/WebCodecs path when your browser supports them.
Download MP3: Save the finished MP3. No server upload - your recording stays private.

WhatsApp OPUS/OGG voice notes, phone recordings, and music clips all route through the same private in-browser encoder.

Universal Audio to MP3 - Including WhatsApp

WhatsApp saves voice notes as efficient OPUS or OGG audio. That is great for chat, but many editors, transcription tools, and older players expect MP3.

This converter accepts a wide range of inputs - not only WhatsApp exports. WAV and M4A use the fast browser decoder path. Formats your browser cannot decode directly are handled automatically in the background without sending your file to a server.

Because audio files are small compared with video, conversion is usually quick even on a laptop or phone browser.

Which Inputs Work Best?

Format	Typical source	Path
WAV / M4A / OGG / AAC	Exports, podcasts, WhatsApp containers	Fast Mediabunny + WebCodecs
AMR / FLAC / WMA	Phone voice, lossless archives, Windows audio	Automatic in-browser fallback decoder
MP3	Already MP3 - re-encoded to 192 kbps	Mediabunny transcode

When in doubt, try your file - unsupported codecs return a clear browser error instead of uploading anywhere.

Audio to MP3 FAQ

Can I convert WhatsApp voice notes to MP3?

Yes. Export or forward the voice note file, drop it here, and download a standard MP3 for players, editors, or transcription apps.

Is my audio uploaded?

No. Encoding runs locally in your browser tab.

Will I lose quality?

Output is 192 kbps MP3 - a practical balance for voice and music sharing. Keep your original lossless file if it is your master archive.

Is there a file size limit?

There is no upload cap because nothing is sent to a server. Very large files are limited only by your device memory.

Related converters

Audio to MP3: Same engine with format-focused landing copy
WAV to MP3: Dedicated WAV extraction landing page
AMR to MP3: Phone voice recording format
AAC to MP3: Free online AAC to MP3 converter, transcode audio in your browser.
FLAC to MP3: Free online FLAC to MP3 converter, transcode audio in your browser.
M4A to MP3: Free online M4A to MP3 converter, transcode audio in your browser.
M4V to MP3: Free online M4V to MP3 converter. Extract audio in your browser.

View all converters

How to Convert Audio to MP3 in Your Browser

Choose your audio file: Drop a WhatsApp voice note, M4A, WAV, OGG, AAC, AMR, or any common audio file.

Transcode locally: GrepCut encodes to 192 kbps MP3 on your device. WAV, M4A, and OGG use the fast Mediabunny/WebCodecs path when your browser supports them.

Download MP3: Save the finished MP3. No server upload - your recording stays private.