03
KEEP
ID3 tags preserved
Title, artist, album, track number — copies through from the source MP4 metadata when available. Editable before export.
02
ENCODE
MP3 · 192 kbps default
LAME-equivalent MP3 encoder runs in the browser. 192 kbps is the default; pick higher for music, lower for spoken word.
04
BATCH
Folder of videos, ZIP of audio
Drop a folder, get a ZIP of MP3s named to match. Useful for podcast archive extraction or lecture-recording libraries.
192kbpsDefault
0MBUpload
100%Local
What it actually does
01 · DEMUX
FFmpeg.wasm, locally
The same FFmpeg the open-source community has refined for two decades, compiled to WebAssembly. Demuxes the MP4 container, drops the video track, keeps the audio track.
02 · ENCODE
Pick your bitrate
128, 192, 320 kbps CBR — or original-quality VBR. Default is 192. Morph never silently downgrades the bitrate to fit a server quota.
03 · KEEP
Local files only
Drop, demux, download. The MP4 stays where you dropped it from. The MP3 saves where you tell it to. Nothing in between.
How it works
- Open morph.cool in any modern browser. No install, no account, no card.
- Drop the MP4 — or a folder of MP4s — onto the drop zone.
- Pick MP3 as the output format. Choose bitrate or accept the 192 kbps default.
- Watch the progress bar. Average extraction is faster than the video's runtime.
- Save the MP3 to disk. The original MP4 is still on your machine, untouched.
Why MP4-to-MP3 sites feel awful
The top-ranked converter site built its position and hid the conversion behind a 100 MB cap, a server queue, and a banner ad shelf that tries to trick you into installing a browser extension. Its rivals run the same playbook on different domains — same caps, more aggressive interstitials, identical "premium upgrade" funnel. Some upload the entire video to a third-party machine, apply a soft watermark to the output filename, and count your conversions toward a daily quota you can only escape by paying. Some email you a download link forty minutes later. The pattern is the same: server-uploads as the business model, file-size caps as the upgrade lever, and your videos as the toll. Morph is the local-only, no-upload version of all of them at the price of a coffee a year — and unlike them, your concert recordings, voice memos, and family videos never touch a server you've never seen.
Where the upload sites still win
If you're on a 2009 Chromebook with 2 GB of RAM and a 200 MB MP4, the server-side tools will outrun your hardware. They have whole datacenters; you have a browser tab. Morph runs locally — speed scales with your machine. For everyone else, that tradeoff lands the other direction.
Frequently asked
How is this different from the top-ranked converter sites?
Both upload the entire MP4 to their servers, queue it behind everyone else's job, cap free conversions by file size, and run banner ads alongside the result. Morph runs FFmpeg.wasm directly in your browser via WebAssembly — no upload, no queue, no ad wall, no daily cap.
What MP3 bitrate do I get?
Default is 192 kbps CBR — broadcast-grade and indistinguishable from the AAC source for most ears. You can switch to 320 kbps for max fidelity or 128 kbps to shrink the file. Morph never silently downgrades the bitrate.
Will it extract audio from any MP4?
Yes — any MP4 with an AAC, AC3, or MP3 audio track. Morph handles screen recordings, drone footage, music videos, podcasts, voice memos, ripped DVDs. The only thing it can't extract is what isn't there — silent footage.
Can I batch a whole folder of MP4s?
Yes. Drop a folder, drop fifty files, drop two hundred. The free tier has no batch limit. The only constraint is your device's available memory.
Does it work for big files?
Yes. The converter sites cap free uploads at 100 MB. Morph is bounded only by your machine — laptops handle multi-gigabyte concert recordings without breathing hard, because the file never moves.
What about the original video?
Untouched. Morph never modifies the source MP4. The MP3 is a brand-new file written next to it. Originals stay where you dropped them from.