AUD · Audio tools

MP4 to MP3 Converter

Drag & Drop or Click to Select a Video

MP4, MOV, MKV, WebM, or an audio file

Tip: paste an audio file from clipboard (Ctrl/⌘+V).

Shareable link

Settings are written to the URL as you change them. Nothing differs from the defaults yet.

Convert MP4 to MP3

Drop an MP4 and download an MP3 of its audio at 192 kbps. Sample rate and channel count carry through from the source, and the video track is discarded.

Two lossy passes

The audio inside an MP4 is almost always AAC, which is already lossy. Encoding it to MP3 throws away a second round of detail. At 192 kbps the difference is hard to hear on speech and noticeable on dense music.

Where MP3 is not a requirement, copying the AAC out keeps the audio exactly as the video held it. WAV is the other option when the file is heading into an editor.

Take a section

Drag a range across the waveform and tick the range option to write only that span, instead of exporting the whole thing and trimming afterwards.

Frequently Asked Questions

Does the video need to be uploaded first?

No. The file is read from disk in pieces and only its audio track is decoded, so a two hour video does not have to be loaded into memory.

Which bitrate does this use?

192 kbps. Open the full tool for 96, 128, 256, or 320 kbps, or for WAV and FLAC output.

Is this lossy?

Yes, twice over. The MP4's audio is already AAC, and encoding it to MP3 is a second lossy pass. Use the MP4 to M4A page to copy the AAC out untouched instead.

What if the MP4 has no sound?

There is nothing to extract, and the probe reports it rather than writing a silent file. Screen recordings are often captured without an audio track.

Jump straight to an extraction

Full Extract Audio from Video tool

001MKV to MP3 Converter

002MOV to MP3 Converter

003MP4 to M4A Converter

004MP4 to WAV Converter

005Video to MP3 Converter

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Convert audio between WAV, MP3, M4A, Ogg Opus, and FLAC. Reads MP3, WAV, FLAC, M4A, AAC, Ogg, Opus, and WebM audio, and keeps the source sample rate and channel count.

Add Silence to Audio

Pad an audio file with silence before it starts and after it ends, up to 30 seconds each, or drop silence in at the playhead. The source audio is copied through unaltered.

Audio Sample Rate Converter

Resample an audio file to 44.1, 48, 22.05, 16 kHz, or another delivery rate, downmix it to mono, and export it as WAV, FLAC, MP3, M4A, or Ogg Opus.

Extract Audio from Video

Pull the audio track out of an MP4, MOV, MKV, WebM, or MPEG-TS file. Copy it into a new container without re-encoding, or decode it to WAV, MP3, M4A, Ogg Opus, or FLAC.

Audio Metadata Viewer

Read the container, codec, sample rate, channel count, duration, average bitrate, and embedded title, artist, and album tags of an audio file, and copy the whole report as JSON.

Audio Stereo Width

Widen or narrow the stereo image of an audio file from 0 to 200%, pan it with constant-power gains, and fold the side channel to mono below a crossover you set.

Audio Compressor

Shrink an audio file by re-encoding it to MP3, AAC, or Opus. Set a bitrate or a target size in megabytes, downsample or downmix to mono, and read the estimated output before the export runs.

Audio Speed Changer

Play an audio file from 0.1x to 10x its original speed and keep the pitch where it was, or let pitch rise and fall with tempo the way a tape machine does.

Image to Base64 Converter

Convert JPEG, PNG, and WebP images to Base64 strings. Format the output as raw Base64, data URLs, CSS variables, HTML tags, or Markdown links.

BPM Detector

Find the tempo of an audio file from its onset pattern, with a confidence figure, the half and double time candidates, and the beat lengths in milliseconds for setting a delay or a modulation rate.

Audio Bitcrusher

Reduce an audio file to between 1 and 16 bits and divide its sample rate by up to 64, with a wet/dry mix, for quantisation noise and aliasing.

Audio Fade In and Out

Add a fade-in at the start and a fade-out at the end of an audio file, with a linear, equal-power, or exponential curve and lengths up to 30 seconds each.