How to Convert MOV to MP4 Without Losing Quality (iPhone, Mac or Windows)
Why iPhones record MOV, when MOV to MP4 is a lossless re-wrap and when it has to re-encode, and how to keep quality and file size under control.
Updated September 15, 20266 min read
To convert MOV to MP4 without losing quality, first find out which codec is inside the MOV. If it is H.264, the video can be re-wrapped into an MP4 container with no re-encoding and no loss at all. If it is HEVC — what an iPhone records on its High Efficiency setting — a re-wrap still works, but the file stays HEVC; for an MP4 that plays on every Windows PC and Android phone it has to be re-encoded to H.264, and the job becomes keeping that one re-encode clean.
Why your iPhone records MOV
MOV is Apple's QuickTime container, and MP4 was derived from it, so the two are close cousins. The container is only the wrapper; what decides whether a file plays is the codec inside it. iPhones offer two. Under Settings → Camera → Formats, *High Efficiency* records HEVC (H.265) and *Most Compatible* records H.264. Apple's HEIF and HEVC support page says HEVC compresses better than H.264 while keeping the same visual quality, which is why it saves so much space on the phone.
The same page notes that when you share over AirDrop, Messages or email with a device that lacks HEVC support, the iPhone may automatically send a more compatible H.264 version. Other routes, such as copying files to a computer, can hand over the original HEVC MOV — and that is usually when the trouble starts. It is the video half of the same decision that makes iPhone photos HEIC rather than JPG.
Re-wrap or re-encode: the decision that matters
Two genuinely different operations are both called 'converting MOV to MP4', and they have very different costs.
| Re-wrap (remux) | Re-encode | |
|---|---|---|
| What happens | The compressed video and audio are copied into an MP4 container untouched | The video is decoded and compressed again, as H.264 |
| Quality | Identical to the original | A small, controllable loss |
| Speed | Fast — nothing is recompressed | Slower — every frame is encoded |
| File size | About the same as the MOV | Depends on the quality you choose |
| Fixes an HEVC playback problem? | No — the video is still HEVC | Yes |
So an H.264 MOV should always be re-wrapped: you get a universally compatible MP4 at no cost. An HEVC MOV can be re-wrapped too, which satisfies apps and upload forms that simply reject the .mov extension, but the result is an HEVC MP4 — and Windows' own apps need Microsoft's HEVC Video Extensions add-on from the Microsoft Store to play one. If the file is for someone whose setup you do not know, re-encode it to H.264.
How to convert MOV to MP4
For a lossless re-wrap
Open the video cutter, load the MOV, set the range from the very first frame to the last, choose MP4 and leave the method on Lossless, which is the default. The cutter copies the encoded video and audio into the new container without touching them. If a codec cannot be carried in MP4, it says so before you export and falls back to a re-encode, rather than doing that silently. On the free plan this works for files of up to 100MB and exports of up to ten minutes.
For maximum compatibility: re-encode to H.264
Load the MOV
Open the MOV to MP4 converter and add the file. The output is fixed to MP4 with H.264 video. The free plan converts one file at a time, up to 100MB and five minutes long.
Choose High quality
The converter sets its bitrate from what your source actually spends: High keeps about 90% of it, Medium (the default) about 70% and Low about 45%. For a conversion you care about, use High.
Keep the resolution
Leave resolution on Original. The free plan exports up to 720p and scales a larger source down automatically; Pro keeps 1080p and 4K footage at full size and converts batches of up to 20 files.
Check it, then keep the original
Play the MP4 on the device it is meant for. Keep the MOV anyway: it is the best copy you will ever have, and any future conversion should start from it.
Drop in an iPhone clip and get an H.264 MP4 back. It all runs on your device, not our servers, so a large file is never an upload first.
Convert MOV to MP4Keeping quality and file size under control
Re-encoding HEVC as H.264 has a cost worth understanding. H.264 is the less efficient codec, so it needs more bits than HEVC to look identical. The converter deliberately never spends more bits than the source did — re-encoding cannot add detail, and a 'converted' file bigger than its original helps nobody — so from an HEVC source, expect an MP4 that is somewhat smaller and very slightly softer at High. On a phone that is hard to spot; on a large television it shows first in dark gradients.
- Need it smaller? Use the video compressor instead: it also outputs MP4 and accepts a target size in MB, which is what an email or upload limit actually asks for. Compressing for WhatsApp and email covers the levers.
- Only need part of it? Trim first with the cutter's lossless method — every second you remove is a second that never gets re-encoded.
- Convert once. Each re-encode loses a little more. Go back to the original MOV rather than converting a copy of a copy.
- 60 fps clips stay 60 fps. The converter keeps the source frame rate unless you ask for a different one.
Where MOV causes problems
MOV plays natively on Macs, iPhones and iPads. Outside Apple's world, results depend on both the container and the codec inside it:
- Windows: HEVC video — in a MOV or an MP4 — needs the HEVC Video Extensions add-on in Windows' own apps. An H.264 MP4 needs nothing extra.
- Android: HEVC support varies by handset and app. H.264 in MP4 is the combination every one of them plays.
- Web uploads: forms and platforms that ask for MP4 sometimes reject
.movby extension alone. A re-wrap fixes that in seconds. - Mac: nothing needs converting to watch it, but convert before sending to anyone who is not on Apple hardware.
The steps above are identical on a Mac, a Windows PC or a phone — the tools run on whichever device you open them on. For the wider picture of which container suits which destination, see MP4 vs MOV vs WebM.
Frequently asked questions
How do I convert MOV to MP4 without losing quality?
Re-wrap it instead of re-encoding: the video cutter's Lossless method copies the original video and audio into an MP4 container untouched, which is truly lossless. If you need H.264 for compatibility, re-encode once, from the original, at High quality.
How do I convert an iPhone MOV to MP4?
Use the MOV to MP4 converter on the phone itself or on a computer. For future clips, Settings → Camera → Formats → Most Compatible makes the iPhone record H.264, which re-wraps into MP4 without any quality loss.
Why won't my MOV file play on Windows?
Usually because the video inside is HEVC, not because it is a MOV. Windows needs Microsoft's HEVC Video Extensions to play HEVC; converting to an H.264 MP4 removes the need for any add-on.
Is MP4 better quality than MOV?
Neither container has a quality of its own — the codec and bitrate decide that. The same H.264 video looks identical in either. MP4 simply opens in more places.
Does converting MOV to MP4 make the file smaller?
A re-wrap leaves the size almost unchanged. A re-encode in our converter usually comes out smaller, because it never spends more bits than the source. If you need a specific size, use the compressor's target-size mode.