VideoMergerThe problem it solves
You've got a handful of clips (a recording that got split in three, a few phone videos from the same afternoon, an intro and the main video) and you just want one file. Opening a full video editor for that is overkill.
VideoMerger does that one job. Drop the clips in, put them in order, and get one MP4 back.
Why I built this
It's the browser cousin of my Windows Media Merger tool. Same idea, no install, and I added a couple of things I always wanted: a trim button on each clip and a strip that shows every join before you render.
How it works
- Drop two or more clips onto the page, or click Add videos. They're joined top to bottom.
- Put them in order. Drag a row, use the arrow buttons, or press Alt+Up / Alt+Down.
- Trim if you like. Press Trim on a clip, drag the range or scrub the little player, and set the in and out points.
- Check the join points. The strip shows the last frame of each clip next to the first frame of the next, so a wrong order or a stray black frame shows up before you render.
- Merge. Click Quick Merge if it's enabled, otherwise Re-render.
Quick Merge or Re-render?
Quick Merge copies the video and sound exactly as they are and glues them together. The quality is identical to your originals. The catch: every clip has to match the first one (same codec, size, frame rate, encoder settings and audio format). Clips from the same camera or the same export preset usually do.
Re-render decodes every frame, puts it on one common canvas, and encodes a new H.264 file. It takes longer but joins almost anything. Smaller clips are letterboxed to the largest one, the highest frame rate wins, and clips without sound get silence so everything stays in sync. You pick High, Medium or Low quality.
If a clip doesn't match, the table marks it with a warning and tells you why, and Quick Merge is turned off.
A couple of extras
Fade at the joins. With Re-render you can dip to black and fade the sound at every join, from 0.3 to 2 seconds, instead of a hard cut.
Audio only. Tick the box and you get one M4A with just the joined sound. Handy for stitching recordings of a talk together.
Why I ask for your email
Your clips never leave your device. Everything runs in your browser, nothing is uploaded, and it even works offline once loaded. The email is how I keep these tools free and know real people are using them.
I might send you a note now and then about other free tools I build. I will never sell or give your email to anyone else.
Questions people ask
Is it really free?
Yes. There's no charge for the tool or per merge. You sign up once per browser and that's it.
Which file types can I merge?
mp4, mov, m4v, 3gp, mkv and webm with H.264, H.265, VP9 or AV1 video. The output is always one MP4 (or M4A for audio only). avi, wmv, flv, mpg and ts aren't supported here.
Which browser do I need?
Chrome or Edge, on Windows, Mac, Android or ChromeOS. Firefox and Safari don't have the video encoder support it needs.
Will I lose quality?
Not with Quick Merge, which copies your clips untouched. Re-render makes a new file, so pick High quality if that matters.
Where does the merged file go?
Loose files: your Downloads folder. Drop a whole folder and the merged file is written into that folder, never overwriting an existing file.
Is there a length limit?
No set limit, but the whole merged file is built in your browser's memory, so very long merges may run into the memory your device has.