MP4 to MP3

How to convert MP4 to MP3 online — 3 steps

What is an online MP4 to MP3 converter?

An online converter pulls the audio track out of a video file and hands it to you as an MP3 — no app, no upload. Drop in a clip, pick whether you want the whole soundtrack or a section of it, and download.

RapKit's converter runs entirely in your browser, so 200MB videos convert without waiting on a server. MP4, MOV and WebM all work — the formats phones and editors actually produce. The video itself stays untouched on your device.

MP4 to MP3 or Extract Audio — same engine, two presets

This page is tuned for the most common job: video in, MP3 out. Need the format menu open — M4A for iPhone compatibility or lossless WAV for editing? That is what our Extract Audio from Video page is for: same engine, every output format up front.

Every video your phone produces — MP4, MOV, WebM

MP4, MOV and WebM cover everything phones, cameras and editors export — every video to MP3 job runs here. Extraction happens in your browser with ffmpeg.wasm: a 200MB video never touches a server, and the soundtrack comes out sounding exactly as it does in the video. Longer videos? Sign in and the cloud handles files beyond the browser's memory.

Why people convert MP4 to MP3

The pattern behind almost every conversion is the same: the video was the container, the song was the point. A lecture recording becomes commute listening. A music video donates its track to the gym playlist. An interview film becomes a podcast draft. A set of clips becomes reference audio for an edit. In each case the picture did its job once and the audio is the part with a second life — converting MP4 to MP3 is simply letting the soundtrack out.

Pick the audio span before you convert

The step most converters skip and this one keeps: before the MP3 exists, you choose which part of the soundtrack comes out. Skip a long cold open, keep only the song and drop the talking, or trim a two-hour stream down to the one performance that mattered. The span picker works on the video's own waveform, so the choice is visual — and because extraction runs in your browser, previewing the span costs nothing and converts nothing you did not select.

MP3 first — but M4A and WAV one click away

MP3 is the preselected export because it plays everywhere — messaging apps, car stereos, every phone of the last decade. But the dropdown keeps M4A for Apple libraries and WAV for editing, so the same dropped video can serve all three destinations without a second upload. The decision is reversible up to the moment you hit export, and files up to 200MB never leave the browser while you decide.

What the converter will not do

Stated plainly so nothing surprises you: it extracts the audio that exists in the video — it cannot upgrade a muffled source to studio quality, and a camera recording from the back of a hall stays roomy. It is not a stem splitter: if voice and music share one track in the video, they arrive together in the MP3, and separating them is the vocal remover's job. And it does not upload your video anywhere — which is a feature, but also means the conversion runs on your device, so very long videos take however long your machine takes.

Privacy and quota — the operational bits

The operational facts stay simple: extraction runs in your browser, the video never uploads even at 200MB, and the MP3 only touches a server if you sign in and deliberately save the result to your library. Guests convert three files a day, free accounts ten, and the output carries no watermark. For a job this ordinary — pulling a song out of a video — the tool asks for exactly nothing in return.

Converting on your phone

Most videos live on phones, so the page is built phone-first: the file picker reads the camera roll and downloads, the span picker works with touch, and extraction runs on the device — nothing crosses the network while you pick or convert. A chat-app video becomes an MP3 in about the time it takes to watch it once, and the file lands in downloads ready to share.

Keeping a tidy library of conversions

One habit keeps conversion outputs useful for years: name the MP3 after the song, not the video. Files called video_2024_final(2) are unfindable in six months; tracks named songname-artist slot into a music library without a second thought. The converter hands you a clean file in seconds — the naming half of the job is what makes that file findable the day you actually want it.

Free MP4 to MP3 converter — 3 exports a day without an account

• Guests: 3 exports a day — no sign-up, no card
• Free accounts: 10 exports a day
• Up to 200MB in-browser — the video never reaches a server
• MP3, M4A or WAV out — switchable from the format dropdown

All 13 zero-cost RapKit audio tools are free the same way — see them all.

More free audio tools

Cut the soundtrack down to the good part with the Audio Cutter cut the soundtrack down to the good part, compress it for messaging apps with the Audio Compressor compress it for messaging apps, or turn a chorus into an iPhone ringtone with the Ringtone Maker.