Format conversion
MP4 to MP3
MP4 to MP3 is the single most common video-to-audio conversion on the internet. VideoSplit does it entirely client-side: drop the MP4, get a 320 kbps MP3, no sign-up, no server round-trip.
MP4 audio is almost always AAC, which is already lossy. Converting AAC to MP3 is a transcode (decode-then-re-encode) and adds a second generation of lossy compression. The quality loss at 320 kbps is inaudible to almost everyone, but it is not zero.
Step-by-step
- Open VideoSplit.io. Drop the MP4 onto the upload area. No account required.
- Pick MP3 as the export format. The waveform UI shows WAV and MP3 tags — click MP3.
- Download. The 320 kbps MP3 saves to your Downloads folder with the original filename.
Quality and bitrate guidance
For a 128 kbps AAC source (typical YouTube/Vimeo download), encoding to 320 kbps MP3 is overkill — the source is already the bottleneck. For a 256 kbps+ AAC source (professional video), 320 kbps MP3 preserves enough headroom that any loss is inaudible in a blind test. If you plan to edit the audio further, export WAV instead and encode MP3 at the very end.
Practical notes
- For voice content like podcasts or lectures, 192 kbps MP3 is fine and saves space — but VideoSplit encodes at 320 kbps for consistency.
- If you want smaller files, post-process with ffmpeg: `ffmpeg -i input.mp3 -b:a 192k output.mp3`.
- The free, unlimited, ad-free nature of VideoSplit is possible because MP3 encoding with lamejs is fast enough to run in every modern browser.
Free forever. No upload, no account.
Drop a video, get a WAV or MP3. Runs entirely in your browser — nothing uploads, nothing to install.
Try it free