MOV to MP4 Converter: Make iPhone Videos Play Everywhere

MOV is Apple's QuickTime format. Every iPhone video, every screen recording made with QuickTime Player and many camera files arrive as .mov. Apple devices play them without a second thought, but a Windows laptop, a smart TV, an upload form or a client's Android phone may refuse the file or play sound with a black picture. MP4 is the format that plays almost everywhere, which is why so many people search for this conversion.

This converter changes MOV files into MP4 on our server. It also accepts MKV, WEBM, AVI, WMV, FLV, 3GP, M4V and animated GIF, so the same box works for most videos that will not play where you need them. Below: how it works, why some conversions are instant and lossless while others re-encode, and fixes for the problems people run into most.

How to convert MOV to MP4

1. Drag the MOV file onto the box above, or click it to choose a file. On an iPhone, tap the box and pick the video from your Photos library or the Files app. The box shows today's size and length limits.
2. Check the line under the file name. If your browser can read the video, it shows the length and the size in pixels. If it says your browser cannot preview the file, that is normal for HEVC videos on some Windows and Linux computers; the server still reads them.
3. Click Convert to MP4. The progress bar shows the upload in megabytes, then your place in line if the server is busy, then the conversion.
4. When Your file is ready appears, the MP4 downloads on its own. The result screen shows the size before and after and a short note from the server, for example that the streams were copied without re-encoding.
5. Play the MP4 on the device or site you made it for, then click Convert another file for the next video.

Copy or re-encode: what happens to your video

A video file is a container (MOV, MP4, MKV) holding streams: the picture, encoded with a codec such as H.264 or HEVC, and the sound, usually AAC. Most playback problems come from one of two things: the container is not recognized, or the codec inside is not supported. The converter checks both.

Copying is fast, often only a few seconds after the upload, because nothing is decoded, and it keeps the original resolution, 4K included. Re-encoding takes longer, and videos larger than 1080p are scaled to fit 1920 x 1080 (or 1080 x 1920 for vertical clips), the size phones, laptops and social apps show anyway. Either way, the result is an H.264 MP4 with AAC sound and the index placed at the start of the file (often called fast start), so it begins playing in a browser before it has fully downloaded.

Why iPhone videos are MOV, and how to change that

Apple's Camera app has two capture formats, set in Settings > Camera > Formats:

• High Efficiency saves video as HEVC (H.265). It uses about half the storage, which is why it is the default on current iPhones.
• Most Compatible saves video as H.264, which older computers, TVs and software play without extra codecs.

Both settings still produce a .mov file when you save it from the phone to a computer or the Files app. Switching to Most Compatible does not give you MP4 directly, but it means future MOVs convert to MP4 by a lossless copy. Apple also notes that when you import to a PC over USB, the Photos settings decide whether files are converted: Settings > Apps > Photos, then Transfer to Mac or PC, where Automatic converts to compatible formats and Keep Originals keeps HEVC.

iPhones that record HDR video (Dolby Vision) add another wrinkle: HDR footage can look flat or washed out after conversion on screens and players that do not handle HDR. If that matters for your work, turn off Settings > Camera > Record Video > HDR Video for clips you plan to share widely.

Where MOV causes trouble, and where it does not

Before converting, check if you need to at all. As of October 2026:

• YouTube lists MOV among its supported upload formats, including HEVC. You can upload an iPhone MOV as it is.
• Etsy accepts MOV for listing videos (along with MP4 and a few others), with clips of 3 to 15 seconds and up to 100 MB.
• Windows plays H.264 MOV files in the Media Player and Photos apps, but HEVC needs Microsoft's HEVC Video Extensions, a paid add-on from the Microsoft Store on many PCs. Without it you may get sound and no picture.
• Smart TVs, car screens, digital signage and older Android phones often play MP4 but skip MOV entirely.
• Online forms and some learning platforms only accept .mp4 uploads, even when the codec inside would have worked.
• Older editing software and some free editors on Linux cannot decode HEVC, while H.264 MP4 imports almost everywhere.

If you only need to post the clip to YouTube or Etsy, skip the conversion. If someone on Windows or Android needs to open it, or a form demands MP4, convert it.

MOV and MP4 side by side

The two containers are close relatives: MP4 was based on the QuickTime file format. That is why an H.264 MOV can move into MP4 without touching the picture.

Worked examples

A product demo for a client on Windows

A 48 second iPhone clip, 4K at 30 fps in High Efficiency, is 62 MB as MOV. The client's laptop plays the sound but shows a black screen, because the HEVC extension is not installed. After conversion the MP4 is H.264 at 1080p, the converter's size for re-encoded 4K, and it plays in the default Windows player. If you need the 4K version, switch the phone to Most Compatible for the next take: those files are copied at full resolution. For email, compress it afterwards with the Balanced preset, which often brings a clip this short under the 25 MB attachment limit of Gmail and Outlook.

A QuickTime screen recording for an online course

A 12 minute screen recording from QuickTime Player on a Mac is an H.264 MOV of 380 MB. The course platform only accepts .mp4. The converter copies the streams, so the result has the same picture and nearly the same size. The upload takes most of the time; the conversion itself takes seconds.

Camera footage for a quick social edit

Some mirrorless cameras save MOV files with H.264 picture and uncompressed PCM sound. The picture is copied or re-encoded depending on what the camera used, and the PCM sound becomes AAC. The MP4 imports into phone editing apps that rejected the original.

Video length, size and what stays private

• Limits: the drop box shows the size limit and the longest video the free tool accepts today. Very long recordings are better cut first with the video trimmer, which also accepts MOV.
• Upload time: your upload speed is the real bottleneck. A 1 GB file on a connection that uploads 10 Mbps needs about 15 minutes to send, while a copy conversion then finishes in seconds.
• Privacy: the file goes to our conversion server over HTTPS with the tool name and nothing else. The upload is deleted as soon as the job ends, and the MP4 is deleted 30 minutes after it is ready. The Download button keeps a copy in your open tab, so you can save it again until you leave the page.

Converting a batch of clips

The converter takes one file per job, which keeps phone uploads reliable. For a set of clips from a shoot, convert the first, click Convert another file, and keep going. Rename the results as you save them, for example 2026-10-14-shop-01.mp4, so they sort in shooting order. If you regularly convert dozens of iPhone clips, the quicker fix is upstream: switch Settings > Camera > Formats to Most Compatible for those shoots, so every MOV converts by a lossless copy in seconds, or send the clips from the phone through an app that exports MP4 directly.

Other ways to convert MOV to MP4

• On a Mac with QuickTime Player: File > Export As and a resolution. This writes a MOV again, but in H.264 if you untick HEVC, which many people then rename or convert.
• On iPhone: the Files app has no conversion option. Changing Settings > Camera > Formats to Most Compatible only affects new videos.
• VLC (free, all platforms): Media > Convert / Save, add the file, pick Video - H.264 + MP3 (MP4). It always re-encodes, even when a copy would do.
• ffmpeg (free, command line): ffmpeg -i input.mov -c copy output.mp4 repackages an H.264 file without re-encoding. For HEVC use -c:v libx264 -crf 20 -c:a aac instead.
• This converter: no install, works on phones and Chromebooks, and chooses copy or re-encode for you.

If you publish your videos on YouTube, AM Jarvis YouTube Studio helps with the part before you upload: finding outlier videos in your niche, researching what viewers search for, and writing titles, descriptions and tags for the clip you just converted.

Troubleshooting

The MP4 plays sound but the picture is black

That happens with the original HEVC MOV, not the converted MP4, which is always H.264. Make sure you are opening the new .mp4 file, usually in your Downloads folder.

The MP4 is bigger than the MOV

Your MOV was HEVC. The H.264 copy needs more data for the same picture. Compress it if size matters.

The video is sideways or upside down after conversion

Phones store orientation as a flag, and some players ignore it. Fix the clip with rotate video, which turns the picture itself.

The colors look washed out

The clip was recorded in HDR. See the HDR note above; for future clips turn HDR Video off.

"This file is too long" or "too large"

Cut the part you need with the video trimmer, then convert the shorter clip. The limits are shown in the drop box.

The sound is out of sync in the MP4

Check the original in VLC first. If it drifts there too, the recording itself has the problem, often from a phone that overheated or ran out of storage while filming. If only the MP4 drifts, convert again and tell us which device recorded the clip.

The conversion failed

The file may be incomplete, for example a recording that stopped when the phone ran out of storage. Try playing it in VLC. If VLC cannot play it either, export it again from the source.