Convert
Extract Audio from Video
Pull the audio out of a video and save it as an MP3 — right in your browser. Works with MP4, MOV, WebM, and MKV. Nothing is uploaded. Free, no signup.
Drop a video here, or click to browse
Everything runs in your browser — nothing is uploaded
What this is and why it matters
There are many everyday reasons to want just the sound of a video. A student records an online lecture or a webinar and wants to re-listen as audio on the commute, without burning battery and data on video. A musician films a live performance on a phone and wants the song as an audio file to share or study. A journalist records an interview as video but needs only the audio to send for transcription. Someone finds an old clip with a relative’s voice and wants to keep that voice note on its own. In each case the video is just a wrapper, and what the person actually wants is the audio inside it.
This tool does that extraction in the browser rather than on a server, for the same privacy reason as the rest of the toolkit. The recordings people most want to pull audio from are often personal or sensitive: a private lecture, a confidential interview, a family moment, a voice memo. Uploading that footage to an unknown website just to get the sound out is a poor trade. Here, the video is read into memory on your own device, the audio track is decoded and re-encoded to MP3 locally by a WebAssembly build of FFmpeg, and the MP3 is handed straight back to you. Nothing is transmitted and nothing is stored.
The output is always an MP3 at 192 kbps, and that choice is deliberate. MP3 is the most universally compatible audio format in the world — it plays on every phone, every browser, every music app, every car stereo, with no extra codecs or conversion. At 192 kbps it stays small enough to share easily while sounding clean for speech and music alike. You never have to choose a format or a bitrate; you get a file that simply works everywhere.
How to use this tool
Add your video. Drag the file onto the drop zone above, or click it to open the file picker and choose a video from your device. MP4, MOV, WebM, and MKV are all accepted. The moment it is selected, the tool reads it locally and shows the file name and its size, so you know it is loaded. Nothing uploads — the reading and everything that follows happens on your own machine. Files must be under 500 MB, the practical ceiling for in-browser processing without a server.
Let the engine load on first use. The first time you extract audio, the tool downloads a one-time engine of about 30 MB into your browser. This happens only once — afterwards it is cached, and later extractions start immediately. A short message shows while it loads.
Extract the audio. Press Extract Audio and the tool decodes the video’s audio track and re-encodes it as an MP3, showing a live percentage as it works. Larger or longer videos take a little longer, and you can cancel at any time. Everything stays in your browser while it runs.
Download your MP3. When extraction finishes, the tool shows the size of the resulting audio file and offers it for download as an MP3 named after your original video. If the video turns out to have no audio track at all — a silent screen recording, for example — the tool tells you so clearly rather than handing back an empty file, so you are never left with a useless download.
Examples and use cases
Turning a recorded online lecture into commute audio
A Kota student records a two-hour online physics lecture as a screen capture but does not want to watch the video again — they just want to revise by listening on the bus. They drop the MP4 into this tool, extract the audio, and get a single MP3 they can play in any music app with the screen off, saving battery and data. The lecture recording never left their laptop.
Getting a song out of a performance video
A Pune musician films a friend’s live set on a phone and wants the audio of one song to listen to and learn. Extracting the audio here gives them a clean 192 kbps MP3 of the performance, small enough to share on WhatsApp with the band, without uploading the video to any service.
Pulling interview audio for transcription
A Delhi journalist records an interview as video but the transcription service they use only needs audio. Rather than send the large video file, they extract an MP3 here and upload just that — smaller, faster, and keeping the video itself private on their own machine until they decide what to do with it.
A silent screen recording with no audio
A Bengaluru developer tries to extract audio from a screen recording that was captured without a microphone. The tool detects that the video has no audio track and shows a clear message saying so, instead of producing an empty MP3 — so the developer immediately understands why there is nothing to download.
Frequently asked questions
- Is my video uploaded to a server?
- No. The entire extraction happens inside your browser. Your video is read into memory on your own device, its audio track is decoded and re-encoded to MP3 locally by a WebAssembly build of FFmpeg, and the MP3 is handed straight back to you as a download — no byte of the video or the audio is ever sent to us or anyone else. This is why the tool is safe for private recordings like lectures, interviews, and personal clips. Close the tab and nothing is retained.
- What format and quality is the extracted audio?
- The output is always an MP3 encoded at 192 kbps. MP3 is the most universally compatible audio format — it plays on every phone, browser, music app, and car stereo without any extra software. 192 kbps is a sweet spot that keeps the file small and easy to share while sounding clean for both speech and music. You do not need to choose a format or bitrate; every extraction gives you the same predictable, widely playable MP3.
- Why does the first extraction download about 30 MB?
- The extraction is done by a full build of FFmpeg compiled to WebAssembly so it can run inside your browser. That engine is about 30 MB, and it downloads once the first time you use the tool. After that your browser caches it, so later extractions start right away without downloading it again. This one-time cost is what lets the audio be extracted on your own device instead of on a server you would have to upload your video to.
- What happens if my video has no audio track?
- Some videos — like silent screen recordings or clips filmed without a microphone — contain no audio at all. When that is the case, the tool detects it and shows a clear message saying the video has no audio track to extract, and it does not offer a download. This way you are never handed an empty or broken MP3 and left wondering what went wrong; you get an immediate, honest answer.
- Is there a limit on video size?
- Yes — 500 MB. Because the work is done entirely by your own device inside a browser tab, the whole video has to fit in the tab’s memory while the audio is extracted, and very large files would risk crashing the tab partway through. A 500 MB cap keeps the process reliable. Even below that, very large or long videos use more memory and take longer, so on older phones a big file may be slow; for the smoothest results with large videos, use a computer.