03
KEEP
Local files only
Your MKV stays where it is. The MP4 downloads to your machine. No upload, no logging, no third-party watermark.
What it actually does
02
REPACK
MP4, when possible
Stream-copy when codecs are compatible (no quality loss, fast). Re-encode only when the wrapper demands it. Honest defaults.
04
BATCH
Folder-wide processing
Drop one clip or a whole folder. Free tier has no batch ceiling — your device's RAM is the only limit.
How it works
- Open morph.cool in any modern browser. No install, no account, no card.
- Drop the MKV — single file or full folder. Free tier has no batch limit.
- Pick MP4 from the format menu. Morph runs the codec locally.
- The output downloads to your machine. The original MKV stays untouched.
- Repeat for every file you have. No quotas, no watermarks, no upgrade prompts.
0Server hops
∞Batch limit
1-clickExport
Why people leave the upload-and-queue tools
The pattern is the same on every MKV-to-MP4 site that ranks in Google's top five: drop the file, hit a 100 MB cap, watch a queue progress bar, sit through an ad, get back a watermarked or re-encoded file you didn't ask for. The tax is real — your time, your bandwidth, your privacy — even when the conversion itself is free. Morph collapses the whole pipeline into your browser tab.
Frequently asked
How is this different from the upload-and-wait converter sites?
Those services upload your MKV to a server, queue it behind everyone else's job, cap file sizes, and watermark long videos. Morph runs FFmpeg.wasm in your browser — no upload, no queue, no watermark, no quota.
Will quality drop during conversion?
When stream-copy is possible (compatible codecs), no — the bytes are repacked into a new container without re-encoding. When the codec must change, Morph uses sensible high-quality defaults; the trade-off is honest, not hidden.
How big a file can I convert?
As big as your browser's memory will hold. Most modern laptops handle 4-8 GB clips comfortably. The free tier has no artificial cap.
Can I batch a folder of clips?
Yes. Free tier has no batch limit — drop a folder and let it run.
Does this work on iPhone, iPad, and Android?
Yes on iPad and Android Chrome. iPhone Safari handles smaller clips well; multi-gigabyte conversions are happier on a laptop.
Is there a free tier?
Yes. Everything that runs on your device is free with no cap. AI and server work is paid in credits, about a cent each.
Nothing leaves your device · Free for what you make, credits for what we run