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Rescreen / Free tools / Merge videos

Merge videos

Join several clips into one video, free and with no watermark.

Merge videos

Drop your videos here

or choose them from your device

MP4, MOV, WebM or MKV, up to 30 clips. They stay on your device.

How to merge videos

Add your clips, put them in order, join them and download one MP4.

  1. Add your videos

    Choose or drop two or more MP4, MOV, WebM or MKV files. Add more at any time. Nothing is uploaded.

  2. Put them in order

    Use Up and Down to move a clip, and Remove to take one out. The list shows each clip’s length, size and format.

  3. Join them

    Click Join videos. The page says before you start whether the clips will be copied as they are or re-encoded, and why.

  4. Check and download

    The new MP4 is opened again and measured before it is offered: its length, size and format. Play it on the page, then download it.

Copy or re-encode: how the clips are joined

A video file stores compressed frames, and how they were compressed is written once at the start of the file. Two files can follow each other in one new file only if that description is the same for both. When it is, this page copies every frame and every piece of sound across untouched, moving each clip along by the length of the clips before it. Nothing is decoded, so it takes seconds even for long videos, and the picture is exactly what you recorded.

Takes from the same phone, camera or screen recorder, with the same settings, nearly always match. Clips from different devices, at different sizes, or saved by different apps usually do not. Those are decoded and encoded again as one H.264 MP4, at the size of the largest clip and at least the quality per pixel of the sharpest. That takes about as long as the video plays, or less on a fast computer.

Sound is the part most joiners get wrong. If one clip’s sound is a fraction of a second shorter than its picture, a careless join slides every later clip’s sound out of step. Here each clip starts after both its picture and its sound have ended, and when re-encoding, any gap is filled with silence, so the voice stays on the lips at the end of the tenth clip as at the start of the first.

What happens to your clips

The page looks at every clip before you join them and tells you which of these applies.

What happens to each kind of clip
Your clipsWhat the page doesQuality
Same device, same settings (H.264 or HEVC, AAC sound)Copies them into one MP4, one after anotherUnchanged
Different sizes or shapesRe-encodes at the largest clip’s size; other shapes get black barsEncoded again at the sharpest clip’s rate per pixel
Some clips with no soundRe-encodes and fills those clips with silenceEncoded again
WebM, VP9 or Opus (browser recordings)Re-encodes to H.264 and AAC, which an MP4 plays everywhereEncoded again

Other ways to merge videos

Every computer and phone has a way to join clips. These are free:

QuickTime Player (Mac)

  1. Open the first video, then choose View → Show Clips.
  2. Without selecting anything, choose Edit → Add Clip to End, pick the next video and click Choose Media.
  3. Drag the clips to reorder them, click Done, then choose File → Export As.

Built in, and fine for a few clips from one device. It exports again, so the result can be much larger than the clips.

Clipchamp (Windows)

  1. Open Clipchamp, which comes with Windows 11, and start a new video.
  2. Import the clips and drag them onto the timeline next to each other.
  3. Delete any gap between them, then click Export and choose a resolution.

Adds transitions, titles and music, which this page does not. It always re-encodes.

iMovie (iPhone, iPad and Mac)

  1. Start a new project and choose Movie.
  2. Select the clips in the order you want them, then tap Create Movie.
  3. Drag clips in the timeline to reorder them, then share or save the video.

Free on Apple devices, with transitions between clips.

FFmpeg (Any computer)

  1. Write a text file with one line per clip, in order: file 'take-1.mp4'.
  2. Run ffmpeg -f concat -safe 0 -i list.txt -c copy joined.mp4.
  3. If the clips differ, leave out -c copy so it re-encodes.

Free and the fastest for many files, if you are happy on the command line.

This page needs nothing installed, works the same on any computer, and tells you before it starts whether your clips will keep their quality.

Limitations

  • Clips are joined end to end, with no transitions, titles or music. To shorten a clip first, use the video trimmer.
  • Up to 30 clips at a time. In Chrome and Edge on a computer a big result is written straight to a file you choose; in other browsers the joined video has to fit in memory, up to 2.0 GB.
  • The result is always an MP4. Copying keeps H.264 or HEVC video as it is; anything else is re-encoded to H.264 and AAC.
  • Only the first video and sound tracks of each file are kept. Subtitles, chapters and other tracks are left out. An HDR video that is re-encoded comes out in standard colour.
  • Re-encoding needs WebCodecs, which current Chrome, Edge, Safari and Firefox have. The page says before you start if your browser cannot do it. Copying works without it.
  • On a phone it works for short clips; long ones are better joined on a computer. Keep the tab open until the join finishes.

Sources

  • FFmpeg’s own joiner, which copies without re-encoding, asks that all files have the same streams: the same codecs, the same time base and so on. This page copies under the same rule and re-encodes when the clips differ. Source, checked 8 November 2026.
  • QuickTime Player on a Mac joins movies with Edit → Add Clip to End, after View → Show Clips. Source, checked 8 November 2026.
  • In Clipchamp, clips placed next to each other on the timeline play as one video, and the export offers 480p, 720p, 1080p and 4K; 4K needs a paid plan. Source, checked 8 November 2026.
  • In iMovie on an iPhone or iPad, the highest quality clip in a project sets the movie’s resolution. This page does the same: a re-encode is made at the largest clip’s size. Source, checked 8 November 2026.
  • YouTube takes uploads of up to 256 GB or 12 hours, whichever is less, so a joined video from this page is never too big for it. Source, checked 8 November 2026.

Frequently asked questions

More for tidying clips: the video trimmer, split video to cut a long recording into parts, the crop video tool and the video compressor. Our guide to making a tutorial video covers recording in takes.

How do I merge videos into one?

Choose or drop your videos above, put them in order with the Up and Down buttons, and click Join videos. The page checks the new MP4 and then offers it for download.

Can I merge videos without losing quality?

Yes, when the clips match: same codec, size and settings, as takes from one phone, camera or screen recorder usually are. Then this page copies them into one file without re-encoding. Clips that differ have to be re-encoded, which the page does at the quality per pixel of the sharpest clip.

Can I merge videos of different sizes or from different phones?

Yes. The page re-encodes them to the size of the largest clip and fits clips of another shape inside it with black bars, so a portrait phone video next to a landscape one keeps its whole picture.

Why did my merged video lose its sound partway through?

Usually because one clip had no sound, or sound in another format, and the joining app dropped it. This page fills a clip with no sound with silence and converts sound in other formats, so the sound stays in step with the picture after every join.

How do I combine videos on an iPhone?

Use iMovie: start a Movie project, select the clips in order and tap Create Movie. Or open this page in Safari, choose the videos from your library and join them here.

How do I merge MP4 files on Windows?

Clipchamp, which comes with Windows 11, joins clips on its timeline. Or use this page in Edge or Chrome, which can also save a large result straight to a file.

Is there a limit on how many videos I can join?

Up to 30 at a time. In Chrome and Edge on a computer a big result is written straight to a file you choose; in other browsers the joined video has to fit in memory, up to 2 GB.

Are my videos uploaded?

No. The files are read, joined and checked inside this page, and the result is saved from your browser. We count anonymous page views and whether a join started, finished or failed, never the files or their names.

Does this add a watermark?

No. There is no watermark, no account and no sign-up.

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