About the Merge Videos
Merge Videos puts two or more clips one after another and saves them as a single video. You pick the files, arrange them with the up and down arrows, choose MP4 or WebM and press the button. The first clip decides the picture size; clips with a different shape are centred with black bars instead of being stretched. Each clip keeps its own sound. Your videos are read and written by your browser, so nothing is uploaded and there is no watermark.
Updated October 2026
How to use the Merge Videos
- 1Select two or more videos, or drop them on the page.
- 2Use the arrows to put the clips in the order you want them to play.
- 3Choose MP4 or WebM.
- 4Press Merge videos and wait for the progress bar to finish.
- 5Play the preview, then download the joined video.
Putting clips in the right order
The list on the page is the order of the finished video, from top to bottom. Use the arrows beside each file to move it, and the cross to remove a clip you added by mistake. Because the first clip decides the picture size, place the clip with the shape you prefer at the top. A landscape clip first gives a wide video with a portrait clip sitting in the middle; a portrait clip first does the opposite.
Choosing MP4 or WebM
MP4 with H.264 picture and AAC sound plays in nearly every phone, TV, editor and social app, so it is the safe default. WebM is a good choice for websites, because it is usually smaller at the same quality, but some older devices and editing programs cannot open it.
- Sending to friends, messaging apps or social media: MP4
- Putting a video on your own website: WebM or MP4
- Opening the result in an editor: MP4
What happens to the sound
Each clip brings its own sound, placed exactly under its own picture. The sound of all clips is joined and saved at 48 kHz stereo. If one clip is mono, it is played through both speakers. If a clip has no sound at all, there is just a silent stretch for that part of the video.
Keeping the file small and the job quick
Long clips and full HD or 4K pictures take longer, because every frame is decoded and encoded again. The picture is limited to 1080 pixels on its shorter side, which keeps phone recordings from turning into very large files. If the joined video is still too big to send, run it through Video Compressor afterwards, or cut unwanted parts first with Trim Video.
Tips for a smooth result
Record or export your clips with the same frame rate when you can, so motion looks even across the joins. If the sound level differs between clips, adjust it before merging with Change Video Volume. When you only need to repeat one clip, Loop Video does that in one step, and Video Converter changes the format of the finished file if you need something other than MP4 or WebM.
Features
- Joins any number of clips into one video
- Reorder or remove clips before joining
- Different sizes are fitted with black bars, never stretched
- Keeps the sound of every clip
- MP4 or WebM output
- Nothing is uploaded and nothing is added to the picture
Frequently asked questions
Can I join videos that have different sizes or shapes?
Yes. The first clip sets the size of the finished video. A clip that is taller, wider or smaller is scaled to fit and centred, with black bars where it does not fill the frame.
Which video formats can I merge?
MP4, MOV, WebM and MKV files that your browser can decode. Most phone and camera recordings work. AVI and WMV files cannot be read in a browser.
Is there a limit on the length?
The finished video can be up to 10 minutes long, because the sound is mixed in memory. For longer videos, merge in two steps or shorten the clips with Trim Video first.
Why does merging take longer than the length of the clips?
The clips are decoded and encoded again so they can share one format and size. A recent computer is usually faster than real time; an older phone can be slower.
Will the quality get worse?
Re-encoding can lose a little detail. The tool aims for about the same bitrate as your originals, so most people see no difference.
Does it work with clips that have no sound?
Yes. Clips without sound simply stay silent in the joined video, and the sound of the other clips lines up with its own picture.
Are my videos uploaded?
No. The files are processed on your own device with your browser's video engine, so private clips never leave your phone or computer.
Can I merge a phone video with a screen recording?
Yes. They can have different sizes, frame rates and orientations. The first clip sets the frame, so put the one you want to define the shape first.