Merge Video — free online tool
Did you shoot several sequences and want to join them into a single file? This tool joins your clips end to end, in the order you upload them. When all the clips share the same characteristics, joining is fast and lossless; otherwise, a re-encode is needed.
Drop a MP4, MOV, WEBM, MKV file here, or click to choose one
Processed temporarily, deleted afterDrop a MP4, MOV, WEBM, MKV file here, or click to choose one
MP4, MOV, WEBM, MKV
How it works
Concatenation with or without re-encoding
For two clips to join cleanly without re-encoding, they must share the same codec, resolution, frame rate and audio parameters. In that case, the tool copies them one after the other, which is fast and lossless. When the clips differ, for example one recorded in 1080p and another in 720p, a re-encode is needed to produce a consistent file, which takes longer.
How to use it
Select your files in the order you want, because playback follows the upload order. Then start the merge and download the final video. The resulting file keeps the container of the first clip, for example MP4 for MP4 clips. Check the joins by playing the video, especially the sound transitions, before deleting your original clips.
When to merge
Gather the sequences from one outing shot on a smartphone, stitch back together a recording split into several files by a camera that automatically cuts every few minutes, or join an intro to the main content. Action cameras and meeting recorders often produce segmented files that can be put back end to end this way.
Preparing your clips
The result will be fastest and most faithful if your clips come from the same device and the same settings. If not, harmonize them beforehand: resize them to the same resolution with the resizer, or convert them to the same format. Also remove unneeded sections with the video trimmer to avoid joining superfluous seconds.
Limits of joining
This tool sticks clips one after another: it adds no transitions, titles or music, and does not let you overlay images. It does not do fine editing either. For fades or a complex project, editing software is still needed. Here, the tool's strength is simplicity and the absence of loss when the clips allow it.
Common problems
An audio offset or a visible jump at a join most often means the clips had different parameters, such as different frame rates. A vertical clip joined to a horizontal one may appear with bars or be distorted. When in doubt, standardize the formats first, then run the merge again. A corrupted file will make the whole process fail.
Limitations
Playback order follows upload order. Without compatible clips, a longer re-encode is needed. The tool adds no transitions, music or titles. Accepted formats: MP4, MOV, WebM and MKV, and the output container follows that of the clips uploaded.
Frequently asked questions
In what order will the videos be joined?
In the order you upload them. If the order is wrong, start over and select them in the right order.
Do my clips need to have the same format?
It is not mandatory, but it is preferable. With the same codec, resolution and frame rate, joining is fast and lossless. Otherwise, a re-encode is performed, which takes longer.
Does merging reduce quality?
Not when the clips are compatible, since they are simply copied one after another. With a re-encode, the loss is slight but real.
Can I add transitions or music?
No. The tool simply joins the clips. For fades, titles or a soundtrack, you need video editing software.
What will the final file's format be?
The same container as the clips uploaded, for example MP4 for MP4 clips. If you want a different format, convert it afterwards with the video converter.
What should I do if the sound goes out of sync after merging?
Check that all the clips have the same frame rate and audio parameters. If not, first convert them to a common format, then run the merge again.