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Audio converter

Convert M4A, WAV, FLAC, Ogg and other audio files to MP3, WAV or M4A, many at once, keeping titles and cover art. Nothing is uploaded.

  • Runs in your browser
  • Nothing is uploaded
  • Free, no sign-up

or drop them here. MP3, M4A, WAV, FLAC, Ogg, Opus and the sound in videos. Nothing is uploaded.

Convert to

Plays on everything: phones, cars, old players and every app.

Quality

Sounds the same as the original for most people and most music.

Channels

Stereo stays stereo and mono stays mono.

Where a file has them. Nothing is copied from videos.

    How it works

    Choose one or more sound files, or videos. Each file is read in your browser, and its sound is decoded by your browser's own decoder into plain samples. Those are then saved in the format you choose: MP3 through the MP3 encoder, M4A (AAC) and Opus through your browser's own encoder, and WAV exactly as decoded, 16-bit, or 24-bit for sound that had more detail. Files are converted one after another, and each new file is read back to check it plays before it is offered for download.

    MP3 and M4A keep 44.1 and 48 kHz sound as it is and convert other sample rates; Opus always works at 48 kHz. MP3, M4A and Opus hold up to two channels, so surround sound is mixed down to stereo; Mono mixes every channel into one. With Keep the title, artist and cover picture ticked, the title, artist, album, track and disc numbers, genre, date, lyrics, comment and cover are copied, and nothing else.

    To keep only part of a song, use the MP3 cutter; to cut a video's sound with the picture shown, use video to MP3.

    Questions

    How do I convert M4A or WAV to MP3?

    Choose the files, or drop them on the page, pick MP3 and a quality, and press Convert. Then download each MP3, or all of them as one ZIP. Your browser decodes the sound and the MP3 encoder makes the files on your device, so nothing is uploaded.

    Can I convert MP3 to WAV or M4A?

    Yes. Choose WAV for editing software, or M4A for iPhones and iTunes. WAV can't add back detail an MP3 left out, but it opens in every audio editor. M4A needs a browser with its own AAC encoder: Chrome and Edge on Windows and Mac have one, and the page says if yours doesn't.

    Are the title, artist and cover picture kept?

    Yes, when the original file has them and Keep the title, artist and cover picture is ticked, as it is at first. MP3, M4A and Opus files keep the cover; WAV files keep the words only. Nothing is copied from videos.

    Which bitrate should I choose?

    The default, 192 kbps for MP3 and M4A or 96 kbps for Opus, sounds the same as the original for most people and most music. Choose the lowest for speech and audiobooks, or the highest for the best sound. A higher bitrate can't add detail the original didn't have.

    Limits

    Opens MP3, M4A, AAC, WAV, FLAC, Ogg and Opus files, and the sound in MP4, MOV, WebM and MKV videos, up to 4 GB each and 50 at a time, when your browser can decode their sound. Current Chrome, Edge, Firefox and Safari decode MP3, AAC, Opus, Vorbis, FLAC and WAV; browsers can't decode Dolby Digital or DTS, and the page says which files yours can't. WMA, AIFF, AMR and APE files can't be opened.

    M4A and Opus files can only be made where your browser has an encoder for them that web pages can use; the page checks and says so. MP3s can be up to 600 MB each and WAV files 2 GB. Converting takes a while for long files, and phones take longer than computers; keep the page open until it finishes.

    MP3s are made with LAME, the open-source MP3 encoder, in its JavaScript version (lamejs). This site serves an unmodified copy, with its licence and source.

    Privacy

    This tool runs entirely in your browser. The files you open and what you type are never sent to a server, and nothing is stored after you close the page. See the privacy page.

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