Video to MP3 (Extract Audio)

From video to MP3 without uploading and without waiting for an upload.

The tool opens the video in your browser, unpacks the container (MP4, MOV, WebM, MKV and others) and decodes only the audio track, a few seconds at a time. Each piece is measured, adjusted and encoded on the spot, so a two-hour video does not need gigabytes of memory: the decoded audio is never held whole. The same pass draws the waveform and measures the loudness of the whole file (K-weighting from ITU-R BS.1770), which is what lets you trim a section by looking at the waveform and normalize just that section instantly. MP3 comes out at constant 128, 192, 256 or 320 kbps from the lamejs encoder; at 192 kbps one minute takes about 1.4 MB. WAV is uncompressed 16-bit PCM (about 10 MB per minute in stereo at 44.1 kHz) with a 4 GB ceiling. M4A uses the browser's AAC encoder and only appears when one exists. Sources the MP3 format cannot represent, such as 96 kHz, are resampled to 48 kHz. 5.1 videos are mixed down to stereo, and the Mono option averages the channels. Normalization applies a single gain: it either brings integrated loudness to the target (-14 LUFS for streaming, -16 for podcasts, -23 for TV) or brings the peak to -1 dBFS; in both cases the peak never goes past -1 dBFS, and if the target does not fit the tool says so instead of distorting. The audio that ships with the video keeps its original pitch and length.

Pick the video, pick the format, download.

1. Choose or drop the video. The tool shows the file's details and, in the background, draws the audio waveform and measures the volume.
2. Pick MP3, WAV or M4A and the bitrate. To extract just a section, drag the handles over the waveform, type the times or use the keyboard arrows. More options holds channels, the tag (title and artist) and normalization.
3. Click Extract. Listen to the result in the player, check the size and peak, and download the file.

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Sources and references for this tool

These references help contextualize formulas, standards, APIs and limitations used on this page. They do not replace professional validation when a result has legal, financial, medical or operational impact.

• AudioBuffer.getChannelData(), Web APIsMDN Web Docs, Method returning the Float32Array of samples for a channel, foundation for peak and RMS analysis.
• ITU-R BS.1770-4, Algorithms to Measure Audio Programme LoudnessITU-R, International standard for integrated loudness measurement in LUFS, adopted by streaming platforms.
• EBU R 128, Loudness Normalisation and Permitted Maximum LevelEBU, European broadcast recommendation for loudness normalization at -23 LUFS.

Frequently asked questions

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