Convert MP4 to MP3

Free, no login, and your file never leaves your device.

Open the Extract Audio tool

MP4 to MP3, converted on your own machine

Converting MP4 to MP3 normally means handing your file to a website that uploads it, processes it on a machine you cannot inspect, and asks you to trust a retention paragraph. FileForge removes that step: the Extract Audio tool runs inside this browser tab, so a MP4 file becomes MP3 without ever crossing the network.

Strip the soundtrack out of any video file and save it as MP3, WAV, or AAC. The video stream is discarded and the audio is re-encoded at your chosen bitrate. Everything happens locally in your browser: nothing is uploaded, stored, or logged.

Because the conversion happens on your hardware, throughput depends on your CPU rather than a shared free tier — there are no file-size caps, no watermarks, no daily quotas, and no paid tier that unlocks the real feature set. It also means the page keeps working offline in the browser once loaded, which is handy for confidential material on a locked-down laptop or a phone in aeroplane mode.

Read how the in-browser processing works.

How to convert MP4 to MP3

  1. 1

    Open Extract Audio

    Open the Extract Audio page on FileForge. No sign-up, install, or extension is needed — the tool loads as a normal web page.

  2. 2

    Add your file

    Drop your file into the panel, or click to browse. The file is read locally in your browser and is never uploaded.

  3. 3

    Choose your settings

    Adjust the options in the settings panel — pull the audio track from a video — until the result matches what you need.

  4. 4

    Run and download

    Press the action button, wait for processing to finish on your own CPU, then download the result straight from the page.

MP4 to MP3 — frequently asked questions

Do I need to create an account to use Extract Audio?
No. FileForge requires no sign-up or login — just open the tool and use it.
Is Extract Audio really free?
Yes, completely free with no hidden limits or premium paywall.
Does Extract Audio upload my file to a server?
No. Everything runs locally in your browser. Your file is never uploaded, stored, or transmitted anywhere.
Is there a file size limit?
There is no artificial limit. The practical ceiling is your device's available memory, so very large files work best on a desktop browser with plenty of free RAM.
Does Extract Audio work offline in the browser?
Once the page (and, for audio and video, the FFmpeg engine) has loaded, the tool keeps working without a network connection because all of the processing code already lives in your browser.
Is Extract Audio private enough for confidential documents?
Yes. Because the file is processed on your own CPU, contracts, medical scans, ID photos and payroll data never travel over the network — you can verify that with your browser's network tab open.
Which browsers are supported?
Any modern browser with WebAssembly support — Chrome, Edge, Firefox, Safari, and their mobile versions. No plugins or extensions are required.