Which video formats are supported?

MP4, MOV, AVI, MKV, WebM, FLV, WMV, M4V, 3GP, and most other common video formats. If FFmpeg supports it, this tool does too.

Why does the first conversion take longer?

The first conversion downloads FFmpeg.wasm core files (~30 MB) from a CDN and compiles the WebAssembly module in your browser. This is a one-time cost per browser session — subsequent conversions start immediately.

What quality is the output MP3?

The MP3 is encoded at VBR quality 2 (effectively ~190 kbps average), which is transparent quality for most listeners. The bitrate is determined by the audio content of your video — if the original audio is low-bitrate, the MP3 will reflect that.

What if my video has no audio track?

FFmpeg will return an error. Screen recordings or camera files without a microphone track will fail — you'll see a clear error message on that file.

Can I convert multiple videos at once?

Yes — up to 5 videos per batch. After downloading, clear the queue and add more. Videos are processed one at a time to keep memory usage manageable.

MP3 vs AAC — which is better for audio extracted from video?

For general use, MP3 is the safe choice — every device and app supports it without question. AAC is technically more efficient at the same bitrate, but MP3 compatibility is unmatched. This tool outputs MP3 for maximum compatibility.

Will the audio be out of sync?

No. FFmpeg extracts the audio track directly without re-encoding the timing, so sync is preserved exactly as it was in the source video.

No upload · 100% free · Works in your browser

Extract audio, free forever.

Convert any video to MP3 right in your browser. Nothing is uploaded. Ever.

Why extract audio from video?

Video files are large — a 10-minute MP4 shot at 1080p can easily be 500 MB to 2 GB. If you only need the audio — a podcast recording, a music performance, a lecture, a voiceover — stripping the video track cuts file size to 5–20 MB without any loss in audio quality.

Common use cases: extracting a song from a YouTube download, pulling a voiceover from a screen recording, archiving podcast interviews, converting a music video to a portable audio file for your phone or car.

How to convert video to MP3 online

1
Drop your video
Drag any video file (MP4, MOV, AVI, MKV, WebM) onto the converter, or click to browse. Up to 5 files at once.
2
Wait for FFmpeg to load
The first conversion loads FFmpeg in your browser — a one-time download of about 30 MB. Subsequent conversions are instant.
3
Audio is extracted in your browser
No upload needed. FFmpeg.wasm runs entirely inside your browser tab and pulls the audio track out of the video.
4
Download your MP3
Save each MP3 individually or use Download All for a ZIP archive.

Your videos never leave your device

Most online video converters upload your file to a remote server, process it there, then send the result back. Your video — which might contain private conversations, client recordings, or sensitive footage — passes through infrastructure you know nothing about.

This converter uses FFmpeg.wasm — a WebAssembly build of FFmpeg that runs entirely inside your browser tab. No file is ever transmitted. Close the tab and everything is gone from memory.

Supported video formats

The converter accepts any format FFmpeg can decode — which is essentially everything:

MP4The most common format. From iPhones, Android, cameras, screen recorders.
MOVApple's format. Used by iPhones, Final Cut Pro, and most Mac video apps.
AVIOlder Windows format. Still common in archival and broadcast.
MKVContainer used by most downloaded content. Supports multiple audio tracks.
WebMGoogle's open format. Used by web video and YouTube downloads.
FLV / WMVFlash and Windows Media formats. Legacy but still encountered frequently.

Frequently asked questions

Privacy & Safety

No. Everything runs inside your browser using FFmpeg.wasm — a WebAssembly port of the FFmpeg library. Your video files never leave your device. We have no server receiving them.

Completely free — no sign-up, no credit card, no watermarks. Convert as many videos as you need.

How it Works

Output & Quality