If you have an MP4 video saved on your Windows computer and you only need the sound from it — a favorite song, a recorded lecture, a podcast episode, or a voice memo — there is no need to install any software. mp4tomp3online.com converts MP4 files to MP3 audio directly inside your web browser. It is completely free, requires no account, and the whole process usually takes less than a minute from start to finish.
Audio options
Your files are converted inside your browser and are never uploaded to any server.
Why convert MP4 to MP3?
An MP4 file contains both video and audio. When you only need the sound, keeping the video is a waste of space — MP3 files are typically five to ten times smaller than the MP4s they come from. An MP3 also plays on virtually every device: phones, car stereos, smart speakers, and old MP3 players that cannot open video files at all. Converting lets you listen to lectures while driving, save phone storage, or build a music collection from video clips.
Step 1: Open the converter in your browser
Open Edge, Chrome, or Firefox and go to mp4tomp3online.com. The converter loads instantly — there is nothing to download and no setup wizard to click through. The page works the same in every modern browser, so use whichever one you prefer. Bookmark the page if you convert files often — one click and you are ready to go.
Step 2: Select your MP4 file
Click the select button and choose the MP4 file from your computer. You can also drag and drop the file straight onto the page. If your video is stored in a different format such as MOV, AVI, MKV, or WEBM, that works too — the converter accepts all common video formats, plus audio files like WAV and M4A.
Step 3: Choose your quality settings (optional)
Before converting, you can open the options panel to fine-tune the result. Pick a bitrate: 128 kbps is fine for spoken word, 192 kbps is a good all-round choice, and 320 kbps gives you the best possible quality for music. You can also switch between stereo and mono, change the sample rate, or trim the audio to convert only part of the video — handy for grabbing one song from a long recording.
Step 4: Convert and download your MP3
Hit the convert button and wait a few seconds — the conversion happens right on your own computer, so even large files are processed quickly. When it is done, a download button appears next to your file. Click it, and the MP3 is saved to your Downloads folder, ready to play anywhere.
No installation — and it works on Windows 10 too
Unlike desktop converter programs, there is nothing to install, update, or give administrator permission to. That makes it perfect for work or school computers where you are not allowed to install software. Everything runs on the same web technology in Windows 11 and Windows 10, so the steps above work identically on both. As long as your browser is up to date, you are good to go — no codec packs, no frameworks to install, no bundled toolbars.
Your files never leave your computer
Privacy is where a browser-based converter really shines. Traditional online converters upload your file to a remote server, convert it there, and then let you download the result — your personal videos pass through someone else’s computer. mp4tomp3online.com works differently: the conversion runs entirely inside your browser using your own device’s processor. Your files are never uploaded, stored, or seen by anyone.
Tips for the best results
Choose 320 kbps when converting music you plan to keep, and 128 kbps for voice recordings where small file size matters more. If you only need part of a long video, use the trim option to set a start and end time instead of converting the whole thing. And if you have several videos, add them all at once — the converter queues them up and you can download each MP3 as it finishes.
Frequently asked questions
Is converting MP4 to MP3 on Windows 11 really free?
Yes. The converter is completely free with no limits, no watermarks, and no account required. You can convert as many files as you like.
Do I need to install anything on my PC?
No. Everything happens inside your web browser, so there is nothing to download or install. It works in Edge, Chrome, Firefox, and any other modern browser.
Will this work on Windows 10 as well?
Yes. The converter uses standard web technology that works identically on Windows 11 and Windows 10. Any up-to-date browser is all you need.
Are my files uploaded to a server?
No. The conversion runs entirely in your browser on your own computer. Your files are never uploaded, stored, or shared with anyone.