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Convert MP4 to MP3

Free MP4 to MP3 converter that runs in your browser. No upload, no signup, no watermark. Files never leave your device.

Conversion Successful
100% local. Your file is processed in this tab and never uploaded.

How to Convert MP4 to MP3

Four steps. No uploads, no account, no waiting.

1

Upload your MP4 file

Drag and drop your MP4 file into the converter above, or click to browse and select it from your device. Files stay on your machine and are never uploaded to a server.

2

Select MP3 as the output format

Open the output format picker and choose MP3. The converter automatically detects the input and only shows compatible output formats for your file.

3

Adjust settings (optional)

Use the sliders icon to trim, crop, resize, rotate, mute or rebalance audio, and pick an output quality before converting.

4

Convert and download

Click Convert to run the conversion in your browser. The output MP3 file downloads automatically when ready, with no server round-trip and no watermarks.

Why Convert MP4 to MP3?

MP4 video files contain audio tracks that are inaccessible to music players, podcast apps, audio editors, and car stereos without the video overhead.

Extracting the MP3 separates just the audio stream into a universally compatible file that plays on every device and takes a fraction of the storage.

MP4
MP3
Container
MP4 (ISOBMFF)
Compression
Lossy
Typical codec
H.264 / H.265
Typical bitrate
128-320 kbps
Audio codec
AAC
Sample rate
44.1 kHz / 48 kHz
Streaming friendly
Yes
Metadata
ID3 tags
Device support
Universal
Device support
Universal
Typical use
Web, mobile, TV
Typical use
Music, podcasts

Related Conversions

Other common format conversions you might need.

WAV to MP3
Convert WAV files to MP3
MP3 to WAV
Convert MP3 files to WAV
MOV to MP4
Convert MOV files to MP4
MP4 to GIF
Convert MP4 files to GIF

Frequently Asked Questions

Is the audio quality preserved when extracting from MP4?
The browser tool extracts the audio stream directly without re-encoding when possible, preserving the original quality. When re-encoding is required, quality is set to maximize fidelity.
What bitrate will the extracted MP3 have?
The default extraction targets 192 kbps CBR, which is the standard for high-quality MP3. Lower bitrate originals cannot be upsampled but will be extracted cleanly.
Can I extract audio from a video with multiple audio tracks?
The browser tool extracts the default/first audio track. TeraConvert Desktop lets you select specific audio tracks when the video has multiple language or commentary tracks.
Can I trim the audio during extraction?
Yes. Use the audio editor (sliders icon in the file card) to set a trim range before clicking Convert.
Is this conversion really free, and is my file private?
Yes. The browser conversion runs entirely on your device using WebAssembly. Files are never uploaded to a server and are discarded from memory when you close the page. There is no file size tracking, no account link to your upload, and no cloud storage.
Do I need to create an account to convert files?
No. The browser converter works without signing in. An optional account is only needed if you want to save favorites, track conversion history, or upgrade to the desktop app with Polar license activation.
How fast is the conversion?
Most browser conversions complete in a few seconds. Large files (over 100 MB) or heavy formats (video, high-page PDFs) take longer depending on your device's CPU and available memory. The desktop app runs significantly faster using native engines.

Convert MP4 to MP3 Faster with TeraConvert Desktop

Batch files. No size limits. Native engine. No browser tab.

Batch convertNo size limitsNative speed100% private
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