How this works in your browser
The video stream is discarded and only the audio is handled, which is why extraction finishes far quicker than any video conversion, since no frames are decoded or encoded. The audio is decoded from the source codec and re-encoded with the LAME MP3 encoder in variable bitrate mode at a high quality setting, so the bitrate rises during dense passages and drops during quiet ones rather than sitting at a fixed value. This is a second lossy generation on top of whatever compression the video already applied, which is inaudible at this setting but real, and the reason WAV exists as an option for anyone heading into further editing. Everything runs through FFmpeg compiled to WebAssembly in your browser tab.
Extract Audio (MP3) vs. traditional online converters
| Feature | Extract Audio (MP3) (in-browser) | Traditional online converters |
|---|---|---|
| File upload required | No - never leaves your device | Yes - file is sent to a server |
| Processing queue | None - starts instantly | Often, especially at peak times |
| Watermark on output | Never | Common on free plans |
| Usage limits | None - free, unlimited use | Often capped per day or file size |
| Works offline once loaded | Yes, for most tools | No - requires a live connection |
| Account required | No | Often, for anything beyond a trial |
Who uses Extract Audio (MP3)
Saving a soundtrack
Keep the audio from a video you want to listen to rather than watch.
Podcast and lecture audio
Turn a recorded talk or interview into a file you can play on any device offline.
Universal compatibility
Produce audio in the one format older car stereos and players are certain to accept.
Private recordings
Extract audio from personal or confidential video without uploading it to a service.
How to use Extract Audio (MP3)
- 1
Open the Extract Audio (MP3) tool
Go to tools.slaytic.com and open the MP3 extraction tool. No sign-up or account required.
- 2
Drop your video file
Add an MP4, MOV, MKV, WEBM or AVI file. Nothing is uploaded.
- 3
Download the MP3
Save the audio track as a standalone file that plays anywhere.
Frequently asked questions
Which video formats can I extract audio from?
MP4, MOV, MKV, WEBM and AVI are all supported as input.
Does this reduce audio quality?
MP3 uses lossy compression, but at the default quality setting the difference is not noticeable for typical listening.
Is my file uploaded anywhere?
No, the extraction happens entirely inside your browser tab.
What bitrate is the MP3?
The encoder runs in variable bitrate mode at a high quality setting, which averages somewhere around 190kbps. Variable bitrate spends more bits on complex passages and fewer on quiet ones, so it delivers better sound per megabyte than a fixed rate at the same average.
Why is the audio not as good as the original?
Because two lossy compressions have now been applied: one when the video was encoded, and one when MP3 was written. At this quality setting the second pass is not audible in normal listening, but if the audio is heading into serious editing, extract to WAV instead and avoid the extra generation entirely.
Should I use MP3 or something newer?
MP3 if compatibility is the priority, which is its remaining strength: car stereos, older players, exercise equipment and decades of software all handle it. AAC sounds better at the same size and is the better choice for anything modern.
Is it legal to extract audio from any video?
Extracting audio from your own recordings is straightforward. Taking the soundtrack from copyrighted material you did not create is a separate question governed by copyright law wherever you are, and the tool being free does not change that.