Private browser tool

Free MP4 to MP3 Converter

An MP4 to MP3 converter extracts the soundtrack from a video and saves it as an MP3 audio file. This free video to MP3 converter decodes the audio, lets you trim the start and end, encodes a standard MP3 at 128, 192, or 320 kbps, and downloads it, all inside your browser with no upload.

No uploads Trim before converting 128 to 320 kbps MP3

Speed and supported inputs depend on your browser and device. MP4 with AAC audio works almost everywhere, while MOV, MKV, and some codecs only decode in certain browsers. Videos can be up to 500 MB and 30 minutes so the audio fits in memory. Files never leave your browser.

Drop a video to extract MP3 audio

MP4, MOV, M4V, WebM, MKV, or OGV up to 500.0 MB and 30 minutes. The file stays on this device.

Choose a video or try the generated sample to begin.

How it works

Convert a video to MP3 in four private steps

Add a video

Choose or drag in an MP4, MOV, M4V, WebM, MKV, or OGV file, or try the generated sample. The file stays on your device.

Trim the audio

Set the start and end times with the sliders or by typing times like 1:15.5 to keep only the part you need.

Pick a bitrate

Choose 128 kbps for voice and podcasts, 192 kbps for general use, or 320 kbps for music, then select Convert to MP3.

Preview and download

Play the MP3 in the preview player, then download it with a clean file name based on your video.

MP4 to MP3 converter FAQ

How do I convert MP4 to MP3 for free?

Add your MP4, trim the start and end if needed, choose a bitrate, and select Convert to MP3. When the preview sounds right, select Download MP3. There is no signup, watermark, or upload.

Is my video uploaded to a server?

No. The audio is decoded and encoded into MP3 in your browser on your own device. AICurate never receives, stores, or sees your video or the MP3.

Which bitrate should I choose?

128 kbps is plenty for interviews, webinars, and podcasts. 192 kbps is a good default for mixed content. 320 kbps keeps the most detail for music but makes the largest file.

Why does my video fail to convert?

The video may have no audio track, use an audio codec your browser cannot decode, be damaged, or be longer than 30 minutes or larger than 500 MB. Try an MP4 with AAC audio or a current version of Chrome, Edge, Firefox, or Safari.

Can I extract audio from MOV or WebM videos too?

Yes, when your browser can decode them. WebM works in Chrome, Edge, and Firefox, and MOV works in Safari and usually in Chrome. Supported inputs and conversion speed depend on your browser and device.

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