MP4 to MP3: How to Get the Audio Out of Any Video

To get the audio out of a video, open MP4 to MP3, drop in the video, leave the format on MP3, pick a bitrate (192 kbps is the default) and click Extract MP3. For MOV, WebM or MKV files, use Extract Audio from Video, which works the same way. The video is processed in your browser and never uploaded.

What's the difference between extracting and converting audio?

A video file is a container with separate streams inside it: one for the picture, one for the sound. Phone and camera MP4s usually store their sound as AAC.

"Extracting" means throwing the picture away and keeping the sound. When you ask for MP3, the AAC sound is also decoded and re-encoded as MP3. That's a conversion from one lossy format to another, and it has two practical consequences:

• The MP3 can't sound better than the original soundtrack. Choosing 320 kbps for a soundtrack that was recorded at 128 kbps only makes a bigger file.
• Each lossy re-encode loses a little more, so if you plan to edit the audio, save a lossless WAV for the editing and make the MP3 at the very end.

Which bitrate should I choose for MP4 to MP3?

The tool offers 96, 128, 192, 256 and 320 kbps. A simple rule:

• Speech (lectures, meetings, interviews, sermons): 96–128 kbps.
• Music: 192 kbps. Go to 256 or 320 kbps only when the source is high quality and you want an archive copy.
• Unsure: keep the default, 192 kbps.

An MP3's size is just its bitrate × its length ÷ 8, so you can work it out before you start (1 MB = 1,000,000 bytes here):

• 96 kbps ≈ 0.72 MB per minute
• 128 kbps ≈ 0.96 MB per minute
• 192 kbps ≈ 1.44 MB per minute
• 320 kbps ≈ 2.4 MB per minute

So a 45-minute recorded lecture comes to about 43 MB at 128 kbps or 32 MB at 96 kbps, and a 4-minute song at 192 kbps is about 5.8 MB.

MP3, M4A, WAV or OGG: which format?

The Audio format switch has four choices:

• MP3: plays on everything, from car stereos to old phones. The safe default.
• M4A (AAC): good quality at small sizes and native to Apple devices. Choose it if the next step is an iPhone ringtone.
• WAV: uncompressed, so there's no bitrate to choose. Use it for editing in an audio app. Expect roughly 10–12 MB per minute of stereo sound.
• OGG (Opus): very efficient for speech, but not every device or app plays it.

MP3 always works, because the tool brings its own WebAssembly MP3 encoder when the browser has none. M4A and OGG depend on your browser's built-in encoders. If one isn't available, you get a clear message instead of a broken file.

How do I convert MP4 to MP3, step by step?

1. Open MP4 to MP3 and drop your video onto the upload area. A line underneath shows its length, resolution and codecs. If the video has no sound at all, you'll see "This video has no audio track to extract."
2. Under Audio format, keep MP3 or pick M4A (AAC), WAV or OGG (Opus).
3. Under Bitrate, choose 96 to 320 kbps. The option is hidden for WAV.
4. Click Extract MP3 (the button follows the format you picked). A progress bar shows how far along it is, and you can cancel.
5. The audio file downloads automatically and appears in a player so you can check it. Use Download again if you need a second copy.

There are preset pages for common pairs: MOV to MP3 for iPhone clips, MP4 to WAV for editing, and Video to MP3 for anything else.

Can I convert several videos to MP3 at once?

Yes, with Audio Converter. Drop in several files, including videos, and it takes the sound from each one. It has a few extra controls:

• Output format: MP3, WAV, M4A, OGG or FLAC, where your browser can encode them.
• Quality (bitrate): 64 to 320 kbps for the lossy formats.
• Sample rate: Keep original, 22.05, 32, 44.1 or 48 kHz.
• Channels: Keep original, Mono or Stereo.
• Bit depth for WAV: 16-bit (CD) or 24-bit.

One file downloads directly. Several arrive together in a ZIP.

How do I keep only part of the soundtrack?

There are two good routes:

• Cut straight from the video. Audio Cutter opens video files and reads their soundtrack. Drag across the waveform (or type Start (seconds) and End (seconds)), click Play selection to check it, keep Keep selection (trim), choose a format and click Cut & download. You can add a short fade-in or fade-out at the same time.
• Trim the video first. For long recordings, use Trim Video to copy out just the part you need without re-encoding, then extract the audio from that. The Audio Cutter holds the whole decoded soundtrack in memory, which can be slow for a multi-hour file on a phone.

Troubleshooting

• "This video has no audio track to extract": the file really is silent. Screen recordings made without a microphone often are.
• "This file can't be read in the browser": AVI, WMV and FLV aren't supported. MP4, MOV, M4V, WebM, MKV and MPEG-TS are.
• The MP3 sounds worse than the video did: the bitrate is probably lower than the original's. Try 192 kbps or higher.
• The file is far bigger than expected: you probably chose WAV, which is uncompressed. Switch to MP3 or M4A.
• "This browser can't encode M4A audio" (or OGG): pick MP3, or use Chrome or Edge, which have the widest codec support.

Quick answers

How do I convert MP4 to MP3 without uploading the file?

Open EasyConvert's MP4 to MP3 tool, drop in the video, choose a bitrate and click Extract MP3. Decoding and encoding happen inside your browser, so the video never leaves your device.

What bitrate is best for MP4 to MP3?

Use 192 kbps for music and 96–128 kbps for speech. A higher bitrate than the video's original soundtrack only makes the file bigger without improving the sound.

Does converting MP4 to MP3 lose quality?

A little, because the video's sound (usually AAC) is re-encoded as MP3, which is also lossy. At 192 kbps or more, most people can't hear the difference for music. Choose WAV if you need a copy with no further loss.

Can I extract audio from MOV, WebM or MKV videos?

Yes. Extract Audio from Video accepts MP4, MOV, WebM and MKV files and saves the sound as MP3, M4A, WAV or OGG. AVI, WMV and FLV can't be read in the browser.