# MP4 to MP3 converter that runs in your browser Pick a video and this MP4 to MP3 converter turns its sound into an MP3 on your own device, or into M4A or WAV if you prefer. The file never leaves your browser, so a private recording stays private and a large video needs no upload at all. - Free - Runs in your browser - MP3, M4A or WAV ## How to convert MP4 to MP3 Most converters upload your video to a server first. This one does the work inside your browser tab. That is faster for big files and nobody else ever sees them. 1. **Choose your video**: Drop one video or several. They convert one after another. 2. **Pick format and quality**: MP3 or M4A at 128, 192 or 320 kbps, or WAV, which is uncompressed. 3. **Save the file**: Press Convert, then save each file straight to your device, ready to play or transcribe. ## Why people convert video to MP3 ### Listen on the go A recorded talk or class as an MP3 for your phone or a long drive. ### Smaller files The sound of a video takes far less space than the video itself. ### Audio for editing The soundtrack of a clip, ready for a podcast or audio editor. ### iPhone MOV clips MOV files from the iPhone camera convert the same way. ## What the converter does | Converter | | |---|---| | Price | Free | | Where it runs | In your browser, on your device | | Your file | Stays on your device the whole time | | Input | MP4, MOV, WEBM, MKV, AVI | | Output | MP3 or M4A at 128, 192 or 320 kbps, or uncompressed WAV | | Several files | Drop them at once, they convert one after another | Want the text too? Upload the MP3 for transcription, free for the first 5 minutes of each file on a free account. ## Your file stays with you The converter runs inside your browser. Your video is read and converted on your own device, and no copy reaches Kotosay or anyone else. ## Tools - [free audio converter to MP3](https://kotosay.com/audio-converter) - [video transcription for MP4 and MOV](https://kotosay.com/video-to-text) - [MP3 to text converter](https://kotosay.com/mp3-to-text) - [transcribe audio to text free](https://kotosay.com/free-transcription) ## An MP4 to MP3 converter that stays on your device ### How the MP4 to MP3 converter works When you pick a video, the page loads a small conversion program into your browser. It reads the file on your device, takes out the audio track and writes it as an MP3. Your computer or phone does the work, and the file never leaves it. That makes it safe for private recordings, such as a family video or an internal meeting. You can convert video to MP3 online here and the video still stays on your device. The page works as an MP4 to audio converter and as a video to MP3 converter free of charge. ### Where your videos usually come from Most videos people convert here fall into a few groups, and each has its own short route to this page. - Zoom recordings saved on your computer. Zoom usually writes an audio-only M4A next to the MP4, so look in the meeting folder first. You may already have the sound on its own. - Clips from the phone camera, which are MOV on an iPhone and MP4 on most Android phones. - Videos sent to you in WhatsApp or Telegram. Save them to your gallery or to Files first, then pick them here. - Screen captures made in a browser, which often come as WEBM. ### Can I convert a MOV from my iPhone to MP3? Yes. iPhone videos are usually MOV, and MOV to MP3 works the same as MP4. On the iPhone, save the video to Files first, then open this page in your browser and pick it from there. WEBM, MKV and AVI convert the same way. ### Does converting MP4 to MP3 lose quality? The audio track is re-encoded, and MP3 and M4A are compressed formats. At 192 or 320 kbps you will not hear a difference for speech, and 128 kbps keeps the file smallest. WAV is uncompressed, which some editors like, but the file gets much larger. The picture is dropped in every case. ### Check the video before and after Play a few seconds with the sound on before you convert. A screen recording made with the microphone switched off carries no voice, so there is nothing for the converter to take out. After saving, compare the length of the MP3 with the video. Both should run for the same time. If the MP3 stops early, convert the video again on a computer. ### Matching the quality to where the sound goes For a clip you plan to send in a chat, MP3 at 128 kbps keeps the file light. For a school concert you filmed, 320 kbps holds more of the music, although it cannot add detail the phone microphone never caught. Podcasters who take the sound of a recorded video call often pick WAV, cut it in their editor and export the final MP3 from there. ### Large files and phones Speed depends on your device, because your device does the converting. A laptop handles long videos more easily than an older phone. If a very large file stalls on a phone, try it on a computer. Keep the page open and the screen on until the file is saved. Phones pause pages that go to the background, and that can stop a long conversion halfway. ### Next step: the text Use the MP4 to audio step when you want the MP3 itself. For a transcript, you can upload the video straight to video transcription, because the browser takes out the sound there too. Use this converter for your own files from your own device. ## Converter questions ### How do I convert MP4 to MP3? Pick the video on this page and press Convert. Your browser takes out the audio track and saves it as an MP3 on your device. Nothing is uploaded, so the time it takes depends only on your computer or phone. MOV, WEBM, MKV and AVI work the same way. ### Is the MP4 to MP3 converter free? Yes, it is free. The conversion runs on your own device, inside the browser, so it costs Kotosay no server time. Convert a lecture, a voice note filmed as a video or a clip from your camera roll, and the MP3 is saved straight to your files. ### Does converting MP4 to MP3 lose quality? The audio is re-encoded as MP3, a compressed format, so the file gets much smaller. For speech you will not hear a difference, and most music sounds the same on everyday speakers and headphones. The picture is dropped, because an MP3 holds sound only. ### Can I convert a MOV from my iPhone to MP3? Yes. Save the video to the Files app, open this page in your phone's browser and pick the MOV there. The converter treats MOV like MP4 and saves the MP3 to your phone. For long videos, a computer is usually faster than a phone. ### Is there a file size limit? Each file can be up to 1 GB. The conversion runs on your own computer or phone, so long videos convert more easily on a laptop. If a very large file stalls on an older phone, move it to a computer and convert it there in the browser. ### Are my files deleted after conversion? Your files never leave your device, so nothing waits on a server to be deleted. The converter reads the video in your browser and writes the new file to your own device. The original video stays exactly where it was, and you decide what to keep. ### Is my video uploaded anywhere? No. The conversion runs inside your browser on your own device, and the video stays there the whole time. That makes the converter safe for private recordings, such as family videos, interviews or internal meetings you would rather keep off other servers. ### Does it work on iPhone and Android? Yes, in a current mobile browser. On an iPhone, save the video to Files first and pick it from there. On Android, pick it from the gallery or the file manager. Phones convert more slowly than computers, so long videos are quicker on a laptop. ### Can I convert a YouTube video to MP3? The converter works with video files on your own device. For a video you made yourself, download it from YouTube Studio and convert that file. To read what was said in a YouTube video, paste its link on the YouTube transcript page, which transcribes the audio into text. ### Can I transcribe the MP3 afterwards? Yes. Upload the MP3 for transcription and read the text in the editor. Your first file shows 5 minutes without an account, and a free account transcribes the first 5 minutes of 3 files a day. You can also upload the video itself, since the browser takes out the sound there too. ### Can I convert several videos at once? Yes. Drop several files at once, and they convert one after another in your browser. Pick the format and quality once, press Convert, then save each file as it finishes. A long batch runs faster on a laptop than on a phone, because your own device does the work. - [Kotosay](https://kotosay.com/mp4-to-mp3) ## Site language - [Português](https://kotosay.com/pt-br/converter-mp4-para-mp3.md) - [Español](https://kotosay.com/es/convertir-mp4-a-mp3.md) - [Bahasa Indonesia](https://kotosay.com/id/ubah-mp4-ke-mp3.md) - [Français](https://kotosay.com/fr/convertir-mp4-en-mp3.md) - [Italiano](https://kotosay.com/it/convertire-mp4-in-mp3.md) - [Deutsch](https://kotosay.com/de/mp4-in-mp3-umwandeln.md) - [Türkçe](https://kotosay.com/tr/mp4-mp3-cevirme.md) - [العربية](https://kotosay.com/ar/mp4-to-mp3.md) - [日本語](https://kotosay.com/ja/mp4-to-mp3.md)