Old container · modern player

AVI to MP4 AVI in. MP4 out.

The big-name converters route your file through their server, queue it, watermark the output, and count it against a daily quota. Morph runs the codec via WebAssembly inside your browser tab — drop the AVI, pick MP4, save the file locally. No upload, no queue, no ad wall. Free for everything that runs on your device; AI is paid in credits.

Open Morph
Drop a file here
AVI → MP4
Choose a file
Reads and writes inside this tab. Nothing is sent anywhere.

What it actually does

01
DEMUX

AVI unwrapped

FFmpeg.wasm parses the container, separates video and audio streams, validates timestamps — all in your tab.

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.

03
KEEP

Local files only

Your AVI stays where it is. The MP4 downloads to your machine. No upload, no logging, no third-party watermark.

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

  1. Open morph.cool in any modern browser. No install, no account, no card.
  2. Drop the AVI — single file or full folder. Free tier has no batch limit.
  3. Pick MP4 from the format menu. Morph runs the codec locally.
  4. The output downloads to your machine. The original AVI stays untouched.
  5. 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 AVI-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 AVI 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.

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Nothing leaves your device · Free for what you make, credits for what we run