Video Merger
Add your clips, put them in the right order and merge them into a single video. Clips with different resolutions or frame rates are matched up automatically, and nothing is uploaded — the whole job happens in your browser.
Add video clips
or drag and drop them here
Add at least two clips to join them into one video.
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Your files are processed locally in your browser. They are not uploaded to our servers.
How to use
- Add two or more video clips. MP4, MOV, WebM and MKV all work, and you can mix formats freely.
- Use the arrows to set the order. Each clip's resolution and length is listed, along with the total.
- Choose the output resolution, click “Join videos” and download the result when it's done.
What is this tool?
Video Merger joins clips end to end using FFmpeg compiled to WebAssembly, so the work happens on your own machine instead of on a server. When all your clips already share the same codec, resolution and frame rate, the streams are copied straight through — that takes seconds and costs nothing in quality. When they differ, each clip is scaled onto a common canvas, letterboxed to keep its aspect ratio, brought to a shared frame rate and re-encoded. Clips without a sound track get matching silence so the audio stays in sync. Because nothing is uploaded, there is no file size cap imposed by a server, no queue and no watermark — the practical limit is your device's memory.
Common uses
- Stitching phone clips from an event into one video to share
- Joining a screen recording that got split into several files
- Putting an intro and outro around a main clip
- Combining GoPro or dashcam segments back into one continuous recording
FAQ
Is there a watermark on the merged video?
No. Nothing is added to your video. The tool runs entirely in your browser, so there is no service that needs branding or an upsell — you get exactly the frames you put in.
Can I merge clips with different resolutions?
Yes. Each clip is scaled onto a shared canvas and letterboxed so its aspect ratio is preserved — a portrait phone clip mixed with a landscape one gets black bars rather than being stretched. You can pick the target resolution yourself, or let the tool match the largest clip.
How long does merging take?
If all clips share the same format, the streams are copied and it takes seconds. If they differ, every frame has to be re-encoded in your browser, which is much slower — think minutes rather than seconds for longer clips. The tool tells you afterwards which path it used.
Is there a limit on file size?
No server limit, but a technical one: the video engine is 32-bit, so all your clips plus the result have to fit in roughly 2 GB of memory. A handful of short clips is fine; hours of 4K footage is not. If a merge fails, try fewer or shorter clips.