How to Convert MOV to MP4 in Your Browser Free

To convert a MOV to MP4 for free, drop your QuickTime MOV onto the MOV to MP4 Converter and click Convert — it re-encodes the video to H.264 and the audio to AAC entirely in your browser, then lets you preview and download a universally compatible MP4. Nothing is uploaded: the file never leaves your device, so private recordings stay private.

Here is exactly what the tool does and how to run a conversion from start to finish.

What the converter does

MOV is the format iPhones and Macs record by default, but it can stumble on Windows, Android, and some websites. The converter re-wraps and re-encodes that footage into MP4 with H.264 video and AAC audio — the combination that plays almost everywhere. It uses a WebAssembly build of ffmpeg running locally, so your CPU does the work and no server is involved.

Step by step

1. Add your MOV. Drag a MOV file onto the drop box, or click to browse and select one from your device.
2. Convert to MP4. Click Convert to MP4 and let the in-browser engine encode the video. Short clips finish quickly.
3. Preview the result. Use the built-in player to check the MP4 looks and sounds right before you save it.
4. Download. Save the finished MP4 to your device. That is the whole process — no account, no email.

What to expect from the output

Aspect	Result
Video codec	H.264 — plays on virtually every device and browser
Audio codec	AAC — broad device and platform support
Quality	High-quality default (CRF 23); visually close to the source
File size	Typically smaller than the original MOV
Privacy	100% local — nothing uploaded

Why in-browser conversion is worth it

Because processing happens on your own machine, there is no upload wait, no file-size limit imposed by a server, and no copy of your video sitting on someone else's infrastructure. Once the tool has loaded it even works offline. For personal iPhone recordings, client footage, or anything confidential, that local-only approach is the safest way to convert.

Try the MOV to MP4 Converter — free and 100% in your browser.

FAQ

Do I need to install anything?

No. The converter runs in a normal web browser using WebAssembly. There is nothing to download or install, and no extension is required.

Which browser works best?

Use a modern desktop browser such as an up-to-date Chrome, Edge, or Firefox. Because encoding uses your CPU, a desktop with more processing power will convert faster than a phone.

Is there a file-size or length limit?

There is no server limit, but very long or high-resolution videos take longer because your own device does the encoding. For big files, keep the tab open and expect it to run for a while.

Will the MP4 keep the audio?

Yes. The audio track is re-encoded to AAC, so your MP4 keeps the original sound in a format that plays across devices.

Related free tools

• WebM to MP4 Converter — convert web-recorded WebM clips.
• MKV to MP4 Converter — turn MKV containers into MP4.
• Video Converter — convert between more video formats.
• Compress Video — shrink a file for easier sharing.

Built by ByteVancer

ByteTools is a free product of ByteVancer, a software and web development studio building web apps, SaaS, and custom software. If you need media processing built into your own product, explore how ByteVancer can help.