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Merge Video

Upload 2 to 10 clips, drag them into order and download one MP4. Clips that already match are joined as they are, and a mix of shapes or sizes is rebuilt to fit one frame.

Drop 2 to 10 videos here

Drag videos here or pick from your device

MP4, MOV, MKV, WEBM, AVI, M4V, 3GP, FLV, WMV · up to 500 MB

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How to

How to merge videos into one file

Any mix of the nine formats the upload box lists will do, phone recordings included.

  1. 1

    Upload the clips

    Drag 2 to 10 videos onto the upload box, or click Browse videos and pick them from your device. The counter above the clips shows how many files and how much of the size limit you've used, and dropping more files onto the same box adds them to the batch.

  2. 2

    Put them in order

    Each clip shows as a card with a number on it, and the numbers are the order they'll play in. Drag a card to move it, or use the arrows under it. The small red text under each thumbnail shows the clip's pixel size, which is worth a glance, because a portrait clip in a row of landscape ones gets black bars.

  3. 3

    Merge and download

    Click Merge videos, and the clips upload first, with a percentage bar, before the server joins them; our three-clip test took 28 seconds, and a long batch can take a few minutes. When Merged video ready appears, click Download. The link stops working after 30 minutes, so save the file straight away.

The three steps: drop the videos on the upload box, put the three clips in order while they merge, then download the single merged.mp4 file

Guide

Merging MP4 and MOV clips: what happens to size, smoothness and sound

The tool joins your clips end to end on our server and gives you back one MP4. How it does that depends on whether the clips already match. When every clip was saved in the same video format, at the same picture size and number of frames per second, with the same kind of sound, they're joined as they are. That takes seconds and keeps the picture exactly as it was. When anything differs, every clip is rebuilt into one common format first, and that's what happens to a batch from two different cameras.

A 1080p MP4, a portrait 1080 by 1920 MOV and a 1440p MP4 merged into one 1920 by 1080 file, with the portrait clip padded in black at the sides

Both cases came from the same test run on 21 October 2026, described at the bottom of this page. Two MOV clips that matched were joined in 8 seconds and kept as they were. Three clips that didn't match, a 1080p MP4, a portrait MOV and a 1440p MP4, were rebuilt into one 1920 by 1080 file in 28 seconds. The sections below are what we learned from those runs and from the code that does the work.

Clips of different sizes get black bars, not stretched

When the clips differ, the merged file takes the height of the smallest clip, so a 1440p clip merged with a 1080p one comes out at 1080p and nothing is upscaled. Each clip is then scaled to fit that frame and the gap is filled with black. A portrait phone clip in a row of landscape ones plays with black bars at the sides, as in the picture above, and because the frame is as wide as the widest clip at that height, a 4:3 clip in a widescreen batch gets bars at the sides too. If a clip is sideways, fix it with Rotate Video before you merge.

The merged video is only as smooth as the least smooth clip

Phones and cameras record 24, 30 or 60 still frames a second, and more frames look smoother. A merge of clips that differ comes out at the lowest number in the batch, because dropping frames looks cleaner than inventing them. In our test a clip at 24 frames a second merged with one at 30 gave a file at 24. A 60-frame game recording joined to a 30-frame camera clip will play at 30 for its whole length, so if the smoothness matters, merge it only with other 60-frame clips.

MOV files from an iPhone

MOV clips upload and merge like any other format, including the space-saving format an iPhone records in by default. If all the MOVs match, they're joined as they are and the MP4 you get keeps that iPhone format, which plays on Apple devices and in most current players but may need an add-on from the Microsoft Store on an older Windows PC. A MOV merged with an MP4 from another camera is rebuilt as a standard MP4, which plays everywhere. To turn a single clip into a standard MP4 without merging, use MOV to MP4.

Sound: all clips with audio, or none

When clips are rebuilt, their sound comes back as one stereo track at good quality, which adds about 1 MB per minute of video. There's one combination to avoid: in our test, a merge of a clip with a sound track and two clips with no sound track at all failed with an error after about 80 seconds, while two silent clips merged without trouble. Screen recordings and stock clips often have no sound track. If a merge fails and some of your clips are silent, run the clips with sound through Remove Audio first, then merge; the result will have no sound at all.

The 1 GB limit and large MP4 files

Each clip can be up to 500 MB and the batch up to 1 GB in total. Files go straight from your browser to our storage, so a big clip uploads fine, though on home broadband a 500 MB file still takes a few minutes. A batch over the limit stops with a message before anything uploads. To get under it, trim the clips with Cut Video or shrink them with Compress Video first; compressing two clips the same way also makes them more likely to match and merge without being rebuilt.

Quality and file size when clips are rebuilt

A rebuilt merge uses a standard quality setting, so the result looks close to the originals at normal viewing size, though every extra round of compression loses a little detail. The output size depends on the footage: our three clips went in at 21 MB and came out at 7.8 MB, while two silent clips, one landscape and one portrait, went in at 10.9 MB and came out at 11.6 MB. Joining clips that already match copies the picture exactly, so the quality doesn't change at all.

If the merge fails

Three things stop a merge: a combined size over 1 GB, which the page reports before uploading; a mix of clips with and without sound, covered above; and a clip that isn't a real video, for example a file whose extension was changed by hand. A rebuild has a 30 minute limit on the server, so ten long 4K clips can also time out; cut them down or compress them first. Cancel stops the upload, or stops the page waiting for the result; a merge the server has already started runs to the end, and the files of a failed job are removed by the nightly cleanup.

Last updated: 21 October 2026 · ChangeMyFile

Tested: 21 October 2026, four runs on the live tool, with short cuts of Pixabay stock clips. Two 7-second HEVC MOV clips that matched exactly, 1920 x 1080 at 30 fps with stereo AAC: joined in 8 seconds without re-encoding, back as a 10.2 MB MP4 of 14 seconds with the HEVC video kept. Three clips that didn't match, a 1920 x 1080 MP4 at 29.97 fps, a 1080 x 1920 HEVC MOV at 30 fps and a 2560 x 1440 MP4 at 30 fps, 21 MB together: done in 28 seconds, back as a 7.8 MB H.264 MP4, 1920 x 1080 at 29.97 fps, 21 seconds long, with the portrait clip padded black at the sides and the 1440p clip scaled down. Two clips with no sound track, a 1920 x 1080 MP4 at 24 fps and a 1080 x 1920 MOV at 30 fps: done in 20 seconds, back as an 11.6 MB MP4 at 1920 x 1080, 24 fps, with no audio track. The same two silent clips plus a 2560 x 1440 clip with sound: failed after 80 seconds with the message "ffmpeg failed".

FAQ

Video merging questions

At a glance

Formats you can upload
MP4, MOV, MKV, WebM, AVI, M4V, 3GP, FLV, WMV
Clips per merge
2 to 10
Upload limit
500 MB a clip, 1 GB in total
Result
One MP4
Matching clips
Joined as they are, no quality loss
Mixed clips
Rebuilt as a standard MP4, height of the smallest
Time
8 to 28 seconds in our tests
Where it runs
Our server
Download link
Expires after 30 minutes
Files deleted
Uploads when the job ends, the rest nightly
Account
Not needed
Watermark
None

Can't find your answer? Visit our Help center.

Is it free to merge videos here?
Yes. There's no account to create and no watermark on the merged file. The only limits are the ones on the page itself: 2 to 10 clips, 500 MB each and 1 GB together.
How do I combine MOV files from my iPhone?
Upload them like any other clip; the MOV format an iPhone records in is accepted. If the clips were all shot on the same phone with the same settings, they're joined as they are and the MP4 keeps the iPhone's video format. If one was shot differently, for example at 60 frames a second or in portrait, the whole batch is rebuilt as a standard MP4, at the smoothness of the least smooth clip and the height of the smallest.
Can I merge large MP4 files?
Up to 500 MB a clip and 1 GB for the whole batch. The upload goes straight to our storage, so a 500 MB file is accepted, but it takes as long as your connection needs. If the batch is over 1 GB, the page tells you before anything uploads; compress or cut the clips first.
How do I set the order of the clips?
Each card has a number, and that's the order they'll play in. Drag a card to a new spot, or tap the left and right arrows under it. Adding more files puts them at the end, and the X on a card removes it without affecting the rest.
What happens when the clips are different sizes?
The merged video takes the height of the smallest clip, and every other clip is scaled down to fit with black bars filling any gap. Nothing is stretched. In our test a portrait phone clip merged with two landscape clips came out as a 1920 x 1080 file with the portrait section showing black bars on both sides.
Does merging lower the quality?
If every clip already matches in format, size, frames per second and sound, the video is copied exactly and nothing changes. If they differ, the whole batch is rebuilt at a standard quality setting, which looks close to the original at normal size but is a second round of compression. Shooting all the clips with the same camera settings is the way to keep them untouched.
Will the sound stay in sync?
Each clip's sound is processed together with its own picture, so the sync within a clip isn't affected. The one case that fails is a batch where some clips have an audio track and others have none; that merge errors out on the server. Strip the audio from the clips that have it with Remove Audio, or add a silent track in your editor, then try again.
Why does my 60 fps clip look less smooth after merging?
When clips are rebuilt, the merged file uses the lowest number of frames per second in the batch, because dropping frames looks cleaner than making extra ones up. One 24-frame clip in the batch pulls everything down to 24. If you need 60 throughout, merge only clips that were recorded at 60.
Does it work on a phone?
Yes. Tap Browse videos, select several clips from your camera roll at once, and use the arrows under each card to set the order, since dragging is awkward on a small screen. Keep the tab open while it uploads and merges; if you switch apps, the phone may pause the upload.
What happens to my videos after I upload them?
Each clip goes from your browser straight to our cloud storage over a link that's valid for 10 minutes. Our server downloads it from there, deletes the cloud copy at once, and deletes its own copy of the clips as soon as the merge finishes. The merged file is kept so you can download it; the link stops working after 30 minutes, and a nightly cleanup removes whatever is left, so nothing stays for more than about a day.
Cut VideoCompress VideoExtract AudioRemove AudioRotate VideoVideo to GIF