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PulsarKit

Convert video to MP3

Pull the audio track out of any video and save it as an MP3 at the bitrate you choose, in your browser.

Drop your files here

.mp4, .mov, .mkv, .avi, .webm, .m4v · up to 300 MB

Bitrate
More settings

How to Convert to MP3

  1. 1

    Add your video

    MP4, MOV, MKV, WebM or AVI, up to 300 MB. The picture is never decoded, so the limit here is much higher than for tools that touch the frame.

  2. 2

    Pick an MP3 bitrate

    128 kbps for a small file, 192 for the everyday default, or 320 when the source audio deserves it.

  3. 3

    Click Convert and download

    The result is a plain MP3 with the same length as the video's soundtrack.

Only the sound is touched

The video stream is never opened at all: ffmpeg demultiplexes the container, throws the picture away with a single flag, and encodes only the audio it finds. That is why the size and length limits here are so much bigger than on tools that have to decode frames: a long, heavy file is no heavier on your browser's memory than a five-minute one, because the only thing held in memory is the audio buffer.

Choosing a bitrate

128 kbps is the smallest file and is fine for spoken word: podcasts, lectures, voice memos extracted from a screen recording. 192 kbps is a safe everyday default that keeps most music sounding close to the source. 320 kbps is the ceiling MP3 supports and is worth it for music you care about; it roughly doubles the file size over 192 for a difference most people can only hear on good headphones.

Loudness and multiple audio tracks

Turning on loudness normalization brings the result to a standard −16 LUFS, the level podcasts and voice recordings are usually mixed to, which helps when the source audio is unusually quiet or was recorded at an inconsistent level. Files with more than one audio track, common in downloaded shows with a commentary track, let you pick which one becomes the MP3 before you start.

The soundtrack is pulled out on your device

Whatever the container, MOV, MKV, WebM or AVI, it is opened inside this tab, and only the audio track you pick is encoded to MP3 by the LAME encoder running as WebAssembly; no frame of the picture is decoded. Nothing is uploaded, there is no account, and you can convert as many videos as you like.

Frequently asked questions

Which bitrate should I pick?

192 kbps for most videos. Drop to 128 for spoken word where file size matters more than fidelity, or go up to 320 for music you want to sound as close to the source as MP3 allows.

Does converting to MP3 lose quality?

MP3 is a lossy format, so yes, technically, but at 192 kbps or above the difference from the source is inaudible to nearly everyone on normal playback equipment.

Why can this handle bigger files than other video tools?

The picture is never decoded here; only the audio track is read and encoded, so the memory the browser needs stays small no matter how large or long the video is.

What happens if the video has several audio tracks?

A track picker appears showing each one's language and title, so you can choose the right one, the main mix or a commentary track, before converting.

What if the video has no sound at all?

You'll get a clear message that there's no audio track to extract, with a link to add a soundtrack to the video first if you meant to make one.

Does the file get uploaded to a server?

No. The whole conversion runs on your device in the browser tab, and the video never leaves it.

Does this work on a phone?

Yes. It runs on any browser that can execute WebAssembly, which covers essentially every modern phone and desktop browser.

Related tools

MP4 to MP3Turn an MP4's soundtrack into a standalone MP3 file at the bitrate you choose, in your browser.Mute VideoRemove the sound from a video without touching a single frame of the picture. It is the fastest thing this site can do to a video file.Compress VideoMake a video file smaller in your browser. Pick a quality level or a target size in megabytes; nothing is uploaded anywhere.Trim VideoKeep only the part of a video you need. Pick the start and the end, and the cut lands exactly on the frame you chose.Compress AudioMake an audio file smaller by a preset, or name the size you need and let the bitrate be worked out for you.