SwingFiles
mp4 → mp3EXTRACT • Local processing

Extract audio .MP4 → .MP3

Export the audio track from the video to the target audio format. Video frames are not included in an audio output.

Output scope: Video frames are not included in an audio output.

Extract audio .MP4 → .MP3

Drop Files for Local Browser Processing

Auto-detects magic bytes • Zero daily caps • Instant ZIP & P2P Swing chaining

Target Format & Engine Parameters

EXTRACT: Export the audio track from the video to the target audio format. Video frames are not included in an audio output.

Compute Engine:

Technical Specifications: MP4 (.mp4) vs MP3 (.mp3)

Specification ParameterSource: .MP4 (MP4)Target: .MP3 (MP3)
Full Format NameMPEG-4 Part 14 VideoMPEG-1 Audio Layer III
IANA MIME Typevideo/mp4audio/mpeg
Magic Byte Signature (Hex)66 74 79 70 69 73 6F 6D49 44 33
Compression & FidelityLossy / PerceptualLossy / Perceptual
Alpha / Transparency & DepthYUV 4:2:0 / 10-bit HDR StreamUTF-8 / Binary Structured Stream
Typical Size Reduction Ratio25:111:1
OS & Platform SupportUniversal (Windows, macOS, iOS, Android, Linux, Web)Universal (Windows, macOS, iOS, Android, Linux, Web)

Processing Steps

  1. 1. Drop .MP4 Files Locally
    Choose MP4 (video/mp4) files from your device. The browser checks their type before processing.
  2. 2. Extract Locally
    Export the audio track from the video to the target audio format.
  3. 3. Save .MP3 or Swing P2P
    Download the .mp3 output, export a batch ZIP, or choose "Convert & Swing" to transfer it to another device.

Frequently Asked Questions

What does this MP4 to MP3 route produce?

Export the audio track from the video to the target audio format. Video frames are not included in an audio output.

Does the .mp4 file leave my device?

The conversion runs in your browser. Files are not uploaded to a conversion server.

Can I process large .mp4 files or batches?

There is no daily conversion quota. Large files and batch size depend on available browser memory and the format engine.

Reverse Pair (MP3-TO-MP4) & Related Format Conversions

Reverse: mp3 to mp4
MP3 to MP4MP4 to WAVMP4 to FLACMP4 to AACMP4 to OGG

Same-Wi-Fi P2P Radar Discovery

Devices on the same Wi-Fi appear automatically below — zero codes needed

Scanning local Wi-Fi subnet… Open this page on another device to pair automatically
AES-256-GCM file key stays in the peer channel; compare fingerprints before transferringPeer-to-peer · live speed appears during transfer

Phone ↔ PC Room Pairing

VERIFY PEER
6-Digit Swing Room Code
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Drop Unlimited Files to Swing (20GB+ Direct-to-Disk Stream)

Zero cloud upload caps • 64KB chunked SCTP DataChannel • 4MB backpressure • Mobile Screen WakeLock protection

Ready for zero-cloud WebRTC SCTP streaming (64KB chunks, 4MB backpressure control).
WakeLock: STANDBY