Is my video uploaded to a server?

No. Conversion runs entirely in your browser using ffmpeg compiled to WebAssembly. Your video never leaves your device.

Why does the first conversion take longer?

The first run downloads the ffmpeg engine (~30MB) and caches it. After that, conversions start immediately.

MP4, WebM, MOV, and other formats supported by ffmpeg.wasm. MP4 and WebM are the most reliable.

It changes the tempo of the extracted audio using the atempo filter. 1.0x is the original speed. The range is 0.5x to 2.0x per pass.

Extract audio from video as MP3, trim video clips, and change playback speed. Powered by ffmpeg.wasm.

video to mp3

extract audio from video

mp4 to mp3

trim video online

Drop a video here or click to browseMP4, WebM, MOV. Audio extracted locally with ffmpeg.wasm.

1
Upload a video
Choose an MP4, WebM, or MOV file. The video is processed locally with ffmpeg.wasm and never uploaded.
2
Set the time range
Enter start and end seconds to pick the clip you want to extract audio from. Set end to 0 for the full video.
3
Adjust playback speed
Drag the speed slider to slow down (0.5x) or speed up (2.0x) the extracted audio.
4
Extract and download
Click Extract MP3, then preview the audio and download it as an MP3 file.

Convert MP4 and other video files to GIF animations. Choose time range, size, and frame rate.