Free MP4 to MP3 Converter
Extract the audio track from an MP4 video and save it as an MP3 right in your browser. No upload, no watermark, no sign-up — your video never leaves your device.
Drop your video here
mp4 · mov · webm · mkv · max 200mb · processed locally
How to Convert MP4 to MP3 in Your Browser
Drop in your MP4 video
Add an MP4, MOV, WebM, or MKV file up to 200MB. The video loads straight into your browser — nothing is uploaded.
The audio is extracted locally
An in-browser engine reads the video's audio track and re-encodes it to MP3 — no server, no upload, no queue.
Download your MP3
Play the result to check it, then save the MP3 with one click. No watermark, no sign-up.
Everything You Need to Pull Audio From Video
Extracting an MP3 from a video should be quick, clean, and private. Here's how this tool delivers all three.
Keeps only the audio
The video stream is discarded and the soundtrack is saved as a standalone MP3 — perfect for music, talks, podcasts, and voice notes.
Standard MP3 output
Output is a widely compatible MP3 encoded at good quality, ready to play on any phone, car stereo, or music app.
No upload — 100% private
Everything runs in your browser via ffmpeg compiled to WebAssembly. Your video never touches a server, so nothing can be leaked or retained.
No watermark, no limits
The MP3 comes out clean. No audio watermark, no length cap behind a paywall, no account required.
When to Convert MP4 to MP3
Sometimes you only want the sound. These are the common reasons to pull an MP3 out of a video.
Listen to talks on the go
Turn a recorded lecture, conference talk, or webinar into an MP3 you can play in the background or on a commute.
Save music from a video
Extract the audio from a music video or performance you recorded so you can add it to a playlist.
Reuse a voiceover or interview
Pull the spoken audio out of a video interview or screen recording for transcription, editing, or a podcast.
Shrink a file to audio-only
When you only need the sound, an MP3 is a tiny fraction of the size of the original video.
Extract Audio Without Uploading Your Video
Most MP4-to-MP3 sites upload your whole video to a server, convert it there, and often watermark or cap the result. Doing it locally is private and clean.
In-browser with SupaTools
- Your video never leaves your device
- No audio watermark on the MP3, ever
- No length caps hidden behind a paywall
- Free with no sign-up or file-count limits
Typical online extractors
- Upload your full video to an unknown server
- Free tiers cap length or add a watermark
- Upload and download waits on every file
- Unclear how long your video is stored
Pro Tips for Extracting MP3 Audio
Trim long videos first
In-browser processing is single-threaded, so a two-hour video takes a while. If you only need a segment, a shorter clip extracts much faster.
The first run is the slow one
The ~30MB engine downloads once and is then cached, so the first extraction is slower than every one after it.
MP3 is universal
MP3 plays on virtually everything. Only choose another format if a specific app requires it.
MP4 to MP3 — Frequently Asked Questions
Convert MP4 to MP3 Free — No Watermark
Drop in a video and pull out a clean MP3 in seconds. Nothing leaves your browser.