How to Convert MOV to MP4

Your iPhone shot a perfectly good video. On your phone it plays fine. Then you send it to a friend on Windows, or try to drop it into a website upload, and suddenly it is a problem file. Nothing is wrong with the video itself — the MOV container is just Apple's home turf, and outside of it, things get awkward.

The fix is the free MOV to MP4 tool. It re-encodes your clip to H.264 video with AAC audio in an MP4 container, the format every device, player, and platform accepts without a fuss. The conversion runs entirely in your browser, so the video never gets uploaded anywhere, and there is no account, no watermark, and no fee hiding at the end.

What You Need Before You Start

Get these in order first and the rest is a straight line:

• Your MOV file — straight from your iPhone or Mac. It must be under 500 MB; over that, the tool answers with a "File too large" message and refuses to load it.
• A modern browser — desktop or mobile both work. For a long clip, a computer is the safer bet, because phones encode slower.
• One first-run download — the video engine is about 30 MB and downloads the first time you convert. After that it is cached, and later conversions start immediately.
• An idea of where the MP4 is headed — a Windows friend, an Android phone, a TV, an upload form. The output plays on all of them, so this is just about knowing where to send it once it downloads.

How to Convert MOV to MP4, Step by Step

Step 1: Add your MOV file

Open the tool, then drag your MOV onto the dropzone or click the box to choose it from your device. If you already have the file copied, Ctrl+V pastes it in directly. Once it loads, the box becomes a file card with the name and size on it, and a status line tells you it is ready and to click convert. That "Ready" line matters — it is how you know the file actually loaded instead of silently failing. If you get "File too large" instead, the clip is over the 500 MB cap, and you need a smaller file before anything else will work.

That iPhone clip is probably already on your computer — open MOV to MP4 in a new tab and drop it in to see the file card appear.

Step 2: Click Convert to MP4

Click Convert to MP4 and the tool takes over. First-timers will see the status line pause on loading the video engine — about 30 MB, one time only — and then a progress bar takes over as the file re-encodes to H.264 plus AAC. The re-encode runs at high quality (CRF 23), which the tool's FAQ describes as visually transparent for typical content, so the MP4 should look the same as the MOV on any normal screen. And through all of this, your video stays on your device: the tool is FFmpeg compiled to WebAssembly running in your tab, not a server somewhere doing the work for you.

One click is all this step asks for — open the converter in a new tab, hit Convert to MP4, and watch the progress bar do its thing.

Step 3: Download your MP4

When the job finishes, a Download link shows up with the new file's size beside it. Click it, and the MP4 is yours — send it to the Windows user, play it on the TV, upload it to YouTube, Instagram, or TikTok, where MP4/H.264 is the recommended upload format on every major platform. File size barely changes in this conversion, by the way: MOV and MP4 usually hold the same video inside, so do not expect the dramatic shrinking you get converting an old AVI. What changes is compatibility, and that was the whole point.

Your clip is one download away from playing anywhere — open MOV to MP4 in a new tab and finish the job.

MOV vs MP4: What Is Actually Different?

Less than people assume. Both are containers, and both usually hold the same H.264 video and AAC audio inside. MOV is Apple's container, MP4 is the ISO standard container — technically cousins, with MP4 enjoying near-universal support. That is why the same clip can play beautifully on an iPhone and then baffle a Windows media player, an older smart TV, or a picky upload form: the video is fine, the wrapper is the problem.

The tool's page gives the same rule of thumb as its WebM page, and it is a good one: if your MOV already plays everywhere you need it, do not convert. Every re-encode loses a tiny amount of quality, so converting is for the moment compatibility demands it — sending cross-platform, uploading to a website, playing on a TV. For anything iPhone-to-iPhone, keep the MOV as it is.

Common Problems and Fixes

• "File too large" on adding the file? The MOV is over 500 MB. The tool will not load it at all, so a smaller file is the only way forward.
• First conversion seems stuck? Almost certainly the 30 MB engine downloading for the first time. Give it a moment; every conversion after that starts right away.
• Slow going on a phone? Phones encode slower, and files over 200 MB trigger an on-page warning that conversion may be slow or fail on phones with limited memory. Long clips are a desktop job.
• Will the MP4 look worse than the MOV? Barely, if at all. The re-encode runs at CRF 23, described by the tool's FAQ as visually transparent for typical content, and iPhone footage often comes through with nothing visible lost.
• Why convert at all if my iPhone already shoots H.264? Because the codec was never the problem — the MOV container is what trips up Windows players, some Android phones, TVs, and upload forms. Same video, friendlier wrapper.
• Is the video uploaded anywhere? No. Conversion happens locally via FFmpeg in WebAssembly inside your browser, so the clip never leaves your device — safe for private footage, and fine on a slow connection once the engine is cached.

So the next time an iPhone video bounces off someone else's device, do not re-shoot it or go hunting for desktop software. Three clicks, same video, a wrapper every device understands.