Video to MP3 — Extract Audio in Your Browser
Pull the audio out of any video and save it as an MP3 — no upload, works offline, no sign-up and no file-size limits. Your video is processed on your device and never leaves it.
Runs entirely in your browser — your video is never uploaded.
- No upload Your video never leaves your device — it is processed locally.
- Works offline After the first load it runs with no internet connection.
- No size or daily limits No file caps, no paywalls — only your device memory.
- Private & safe Skip sketchy upload sites; nothing is sent to a server.
How it works
When you choose a file, the video is loaded into your browser's memory and handed to
ffmpeg, the same engine behind countless desktop media apps, compiled here to
WebAssembly so it runs client-side. The tool drops the video stream entirely
(-vn) and re-encodes only the audio track to MP3 with the LAME encoder at the
bitrate you pick. Because every step happens on your own device, there is no server round
trip and your original file is never transmitted anywhere. The first time you convert, the
engine downloads once (about 9 MB) and is then cached for instant, offline use afterward.
How to convert a video to MP3
- Click the drop zone above and choose a video, or drag a file onto it.
- Pick an MP3 bitrate — 128 kbps for voice, 192 kbps for general use, 320 kbps for music.
- Press Extract MP3 and watch the on-device progress bar.
- When it finishes, click Download to save your MP3.
Processing happens on your device — large or long videos can take a few minutes, especially on phones. Audio-only extraction is light, so most files finish quickly.
Why extract audio locally instead of using an upload site
Most "video to MP3" websites work by uploading your file to a remote server, converting it there, and giving you a link. That is slower over a typical connection, hands your private recordings to a third party, and often comes with length caps, queues or paid tiers. This tool flips that model: the converter ships to your browser, so the work is private and there is no upload step at all. It also sidesteps a real safety problem — in March 2025 the FBI's Denver field office publicly warned that some free online file-converter sites were being used to spread malware and harvest uploaded data. Keeping the conversion on your own machine avoids that risk entirely.
| Local (this site) | Typical cloud tool | |
|---|---|---|
| Upload required | No | Usually |
| File-size caps | None (device memory) | Common |
| Works offline | Yes, after first load | No |
| Files stay private | Yes — never sent | Sent to a server |
Common uses
Saving a song or backing track from a music video, turning a recorded lecture or webinar into a podcast-style MP3 for the commute, lifting the audio from an interview to transcribe it, or grabbing a sound effect from a clip — all of these are quick with on-device extraction. Because there are no daily limits, you can batch through a folder of recordings one after another without hitting a paywall.
All video & audio tools
Frequently asked questions
Are my videos uploaded anywhere?
No. The conversion runs entirely inside your browser using ffmpeg compiled to WebAssembly, so the video is read into memory on your own device and the MP3 is written there too. Nothing is sent to a server, there is no upload progress bar to wait through, and no copy of your file is stored anywhere online. When you close the tab, the data is gone from memory.
Which video formats can I extract audio from?
Any container ffmpeg can read, which covers the common ones: MP4, MOV, MKV, WEBM, AVI, FLV, M4V and more. The tool decodes whatever audio track is inside and re-encodes it to MP3, so it does not matter whether the original audio was AAC, Opus, AC-3 or something else.
What bitrate should I choose?
For speech and podcasts, 128 kbps is small and perfectly clear. For music, 192 kbps is a good balance, and 320 kbps is near-transparent for critical listening. Higher bitrates produce larger files but the source audio quality is the real ceiling — extracting at 320 kbps from a low-quality video will not add detail that was never there.
Is there a file-size or length limit?
There is no limit built into the tool. The practical ceiling is your device memory, because the whole file is processed in the browser. A short music video extracts in seconds; a two-hour recording will take longer and use more memory, and very large files (over 500 MB) may be slow on phones or older laptops.
Why is it slower than a desktop program?
Because it runs ffmpeg as WebAssembly in a single browser thread rather than as native multi-core code, audio extraction is a little slower than a native app. The trade-off is privacy and convenience: nothing installs, nothing uploads, and it works on any device with a modern browser. Audio-only extraction is light work, so most files still finish quickly.
Does it work offline?
Yes, after the first visit. The site is a Progressive Web App, so once it has loaded it keeps working with no internet connection. The ffmpeg engine downloads once (about 9 MB) the first time you convert and is then cached on your device for future offline use.
All processing happens on Video Tools entirely within your browser. Videos are never uploaded to a server.