Convert any file, nothing uploaded
Free tools

Free tool

Free audio converter for MP3, WAV, M4A, OGG and FLAC

A free audio converter that runs in your browser.

Your audio

Drag a file here, paste it, or choose one.

.mp3, .wav, .m4a, .aac, .ogg, .oga, .opus, .flac, .aif, .aiff, .mp4, .mov, .webm, .mkv, .m4v, .avi. Up to 500 MB.

Up to 3 hours of audio.

Your file never leaves your browser. The conversion runs on this machine.

Convert to

Encoded with LAME. Plays on every phone, car, browser and podcast host.

Quality

Music at a quality most people cannot tell from the source.

More options
Sample rate

Keep the rate the file already has.

Channels

Keep the channels the file already has.

Fade in
Fade out

Trim

Leave both empty to keep the whole file. Seconds like 1:05.5 work too.

Result

Worked example

Measured on our own 17 second narration as WAV, saved as M4A at 128 kbps.

Source WAV

2.9 MB

M4A, AAC

270 KB

An eleventh of the size. M4A suits Apple devices and is smaller than MP3 at the same quality; pick MP3 instead when the file has to play everywhere.

1. Add your file. 2. Pick the output. 3. Convert in the tab. 4. Listen and download.

What Interlace does

Need a voiceover rather than a file format?

  • Paste the script and pick a natural AI voice
  • Voiceover in 28 languages from one script
  • Scenes drawn and timed to the voice
Hear the voicesMore examples

Real Interlace output, unedited. Shown silent and sped up.

Your file

WAV

narration.wav

To MP3, M4A, OGG or FLAC

How a fridge keeps food coldSoft 3D

Questions

Asked and answered

No. The file is read by the page and converted by ffmpeg compiled to WebAssembly, on your own machine. There is no upload step, and closing the tab discards everything.

MP3 when it has to play on anything. M4A for Apple devices and a smaller file at the same quality. WAV for editing and transcription. FLAC to keep a lossless master in less space than WAV. OGG for games and apps that ask for Vorbis.

For speech, 64 kbps in mono or 128 kbps in stereo. For music, 192 kbps in MP3, or 128 to 192 kbps in M4A. 320 kbps only makes sense from a lossless source like WAV or FLAC.

No. Each compressed encode removes detail, and converting MP3 to WAV or FLAC only stores what is left without compressing it again. Convert once, from the best copy you have.

Up to 500 MB and three hours. WAV and FLAC outputs stop at 60 minutes, because uncompressed audio grows fast and it all has to fit in the browser tab's memory.

More free tools

MP4 to MP3 converterWAV to MP3 converterCompress MP3MP3 to MP4 converter

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