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.