Free online converter

Convert MP4 to MP3 Online
Free, No Upload, Instant

Extract the audio track from any MP4 video and download it as MP3 — entirely in your browser. Preview the waveform, trim if needed, choose your bitrate. Your video never leaves your device.

🔒 No upload ever 🎬 MP4 · MOV · WebM · MKV 🌊 Waveform preview ✂️ Trim before export 🎚️ 128 / 192 / 320 kbps
sound-goods — MP4 to MP3 Processing runs locally in your browser
🎬

Drop your MP4 video here

MP4 · MOV · WebM · MKV · AVI — audio extracted locally, video never uploaded

▍What is the sound-goods MP4 to MP3 Converter?

The sound-goods MP4 to MP3 Converter is a free tool that extracts the audio track from any video file and downloads it as a clean MP3 — with no upload, no account, and no waiting for a server. The entire process happens inside your browser using the Web Audio API: your video is decoded locally, the audio stream is isolated, and it is encoded to MP3 using lamejs, an open-source JavaScript encoder.

This is the same conversion that tools like Zamzar, Convertio, CloudConvert, and FreeConvert perform on their servers — but done entirely on your machine. The result is faster, private, and has no file size cap because nothing travels over the network.

What happens to the video? When you drop an MP4 into the converter, the browser decodes both the video and audio streams from the container. The tool immediately discards the video frames and keeps only the raw audio samples. Those samples are encoded to MP3 and downloaded. The video data never leaves your device — not even temporarily.

▍How to convert MP4 to MP3 — step by step

Drop your video file
Drag and drop your MP4, MOV, WebM, or MKV file onto the converter above — or click to browse. The file is decoded immediately in your browser. No upload occurs.
Preview the audio waveform
Once decoded, the extracted audio is displayed as a waveform. Click Play to confirm the audio quality and content before converting. The playhead animates in real time.
Trim if needed (optional)
Drag the left handle to set a start point and the right handle to set an end point. Only the selected region will be exported. Useful for stripping silence at the beginning or end of a recording.
Choose your bitrate
Select 128 kbps for small file size (podcasts, voice), 192 kbps for music (recommended), or 320 kbps for maximum quality. The bitrate setting controls the output file size and audio fidelity.
Click Convert to MP3
The browser encodes your audio selection and triggers an instant download. A 10-minute video typically converts in under 10 seconds on any modern device.

▍Features

🔒
Zero upload
Your video never leaves your device. The converter is architecturally incapable of sending your file to a server.
🌊
Waveform preview
See and hear the extracted audio before committing to export. Confirm quality, spot silence, find the right section.
✂️
Trim before export
Drag handles to select only the segment you need. No need to run a separate cutter tool after converting.
🎚️
Bitrate control
Choose 128, 192, or 320 kbps. Most converters lock you to a single quality level — sound-goods doesn't.
♾️
No file size limit
No server, no cap. Convert full-length movies, 4K recordings, or multi-hour lectures without any restriction.
⚡
Instant — no queue
No upload queue, no processing wait. Conversion starts the moment you click the button.

▍sound-goods vs. other MP4 to MP3 converters

Featuresound-goodsConvertioZamzarCloudConvert
No file upload ✔✘✘✘
Waveform preview ✔✘✘✘
Trim before export ✔✘✘✘
Bitrate selector ✔ 128/192/320✔✘✔
File size limit (free) None100MB50MB1GB/day
Account required NoNo (basic)No (basic)No (basic)
Conversion speed Instant (local)Depends on server loadDepends on server loadDepends on server load

▍Which bitrate should you choose?

MP3 bitrate determines how much data is used to represent one second of audio. Higher bitrate = larger file size = better quality. Here is a practical guide:

BitrateFile size (3 min)Best forQuality
128 kbps ~2.8 MB Voice, podcasts, speech recordings Good — audible compression on music
192 kbps ★ ~4.3 MB Music, general use (recommended) Transparent for most listeners
320 kbps ~7 MB Audiophiles, archival, DJ use Maximum MP3 quality

For most use cases — extracting a song from a video, saving a lecture, or converting a Zoom recording — 192 kbps is the right choice. The difference between 192 and 320 kbps is inaudible to most people on consumer headphones and speakers.

▍Common use cases

Extracting a song from a music video

Downloaded a music video in MP4 format and want just the audio? Drop the file in, preview the waveform to confirm it's the right track, and convert at 320 kbps for maximum fidelity. No upload, no watermark, no account required.

Saving a lecture or online course video as audio

Convert recorded lectures, webinars, or course videos to MP3 so you can listen while commuting or exercising. Use 128 kbps for voice content — the file size stays small and quality is more than sufficient for speech.

Extracting audio from a Zoom or Teams recording

Meeting recordings are often saved as MP4. Convert them to MP3 for easier storage, sharing, or transcription. Because no upload occurs, confidential meeting recordings stay entirely on your machine throughout the process.

Creating a podcast episode from a video interview

Recorded an interview on video and want to publish it as a podcast? Convert the MP4 to MP3, use the built-in trim handles to remove the pre-roll and post-roll, and export the clean segment ready for upload to your podcast host.

Archiving home videos as audio

Family videos, events, and concerts recorded on your phone can be converted to MP3 to preserve the audio at a fraction of the storage space. Because the tool runs locally, your private recordings never touch a third-party server.

▍Supported video formats

The converter accepts any video format that your browser's media decoder supports. Compatibility varies slightly by browser:

  • MP4 / M4V (H.264 + AAC) — supported in all modern browsers. The most common format for recorded and downloaded video.
  • MOV (QuickTime) — supported in Chrome, Edge, and Safari. May not work in Firefox.
  • WebM (VP8/VP9 + Opus/Vorbis) — supported in Chrome, Firefox, and Edge. Common for web-recorded video.
  • MKV (Matroska) — supported in Chrome and Firefox with standard codecs. May fail if the video uses an uncommon codec.
  • AVI — limited browser support. Chrome handles common AVI variants. Use Chrome for best results.
If your video fails to decode: This typically means your browser doesn't support the codec used in that specific file. Try opening the file in Chrome, which has the broadest codec support. Alternatively, re-encode the video to H.264/AAC MP4 using a tool like HandBrake before converting here.

▍Privacy: why no-upload matters for video files

Video files are uniquely sensitive compared to most file types. A single MP4 can contain faces, voices, locations, timestamps, and metadata that identify real people and real events. When you upload a video to a converter website, that data travels to servers in another country, sits in temporary storage, passes through CDN infrastructure, and is subject to that company's data retention and sharing policies — even if they claim "files are deleted within 24 hours."

sound-goods eliminates this entirely. The conversion is performed by your own CPU, in your own browser's memory sandbox, with no network request made for your file. This makes it the correct choice for:

  • Private family or personal videos
  • Corporate meeting recordings under NDA
  • Legal or medical video evidence
  • Unreleased content or pre-production footage
  • Any video where you cannot guarantee the recipients' data policies

Ready to extract your audio?

Scroll up, drop your video, preview the waveform, and download your MP3 in seconds.

Open the MP4 to MP3 Converter

▍Frequently asked questions

No. Your video is decoded entirely in your browser using the Web Audio API. Nothing is uploaded at any point. The tool is architecturally incapable of sending your file anywhere.
MP4, MOV, WebM, and MKV work in all modern browsers. AVI has limited support — use Chrome for best results. If a file fails to decode, try opening it in Chrome or re-encoding it to H.264 MP4 first.
The audio is re-encoded from the original AAC/AAC stream to MP3 at your chosen bitrate. At 192 kbps and above, the quality difference is inaudible to most listeners on consumer equipment.
No server-side limit. Because nothing is uploaded, the only constraint is your device's RAM. MP4 files up to 2GB work reliably on computers with 8GB of RAM or more.
This tool converts MP4 files stored on your device. It cannot directly access YouTube. To convert a YouTube video, you need to first download it to your device (ensure you have the necessary rights), then drop the MP4 here.
Yes. After the audio waveform is displayed, drag the start and end handles to select the portion you want. Only that region will be exported as MP3.
192 kbps is the best choice for music and general use — transparent quality with a manageable file size. Use 128 kbps for voice-only content like podcasts or lectures. Use 320 kbps for archiving or DJ use where maximum quality is essential.

Need to merge the converted file with other audio? Try our MP3 Merger — free, no upload, crossfade control. Or trim and cut your audio with the MP3 Cutter.

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