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MP4 TO MP3

MP4 to MP3

Extract audio from MP4 videos as MP3

Drag & drop your videos here

or click to browse files

Supports MP4, MOV, AVI, MKV, WebM, M4V, MPEG, MPG, WMV, FLV, 3GP — up to 500MB each (10 files max)

  • Configurable Bitrate

  • Batch Convert

  • Fast & Secure

  • No Installation

How to Convert MP4 to MP3?

  1. 1

    Add videos

    Upload MP4, MOV, AVI, MKV, WebM and other common videos. We validate the real container with ffprobe.

  2. 2

    Choose audio settings

    Pick an MP3 bitrate and optionally adjust sample rate, channels, volume or trim silence.

  3. 3

    Preview the audio

    Listen to a short extracted sample before converting the full video.

  4. 4

    Download

    Save individual MP3s or Download All as a ZIP of successful outputs.

Real audio extraction — not a renamed file

OneFileKit extracts and encodes audio on the server with FFmpeg. Metadata comes from ffprobe and download sizes are measured from actual output bytes — never estimated.

MP3 bitrate controls audio quality and file size, but it does not guarantee a fixed amount of size reduction versus the original video; a short, audio-only MP3 is simply much smaller than a video file in most cases.

Videos without an audio track cannot be converted. Unsupported codecs or containers are rejected with a clear, customer-safe message.

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Frequently asked questions

Which video formats can I convert to MP3?
Upload MP4, MOV, AVI, MKV, WebM, M4V, MPEG, WMV, FLV, 3GP and similar formats when this server’s FFmpeg build can decode them. We validate the real container and streams with ffprobe — renaming a non-video file will not work.
What if my video has no audio track?
We detect this before converting and let you know — there is nothing to extract if the source video has no audio stream.
Which MP3 quality should I choose?
320 kbps gives the best quality at a larger file size; 128 kbps gives the smallest file at lower quality. 192 kbps is a good balance for most videos.
Can I convert multiple videos at once?
Yes. Upload a batch, convert together, then download individual MP3s or all of them as a ZIP of successful outputs.