Video Merger
NewCombine multiple video clips into a single video file, in the order you choose.
Your files are processed entirely in your browser. Nothing is uploaded to any server, and your documents never leave your device.
What is Video Merger?
A video merger joins two or more clips into a single continuous video. Because source clips often differ in resolution, frame rate, or codec, this tool first normalizes each clip to a common format on your device and then concatenates them seamlessly with FFmpeg. You simply add clips, arrange their order, and download one combined MP4. Nothing is uploaded at any point.
Why use Nuo Tools's Video Merger?
How to use Video Merger
Add two or more video clips by dragging them in or browsing.
Arrange the clips into the order they should play.
Click Merge - each clip is prepared and then joined, with progress shown throughout.
Download the single combined MP4.
Frequently asked questions
Can I merge videos with different resolutions?+
Yes. The tool scales every clip to the same resolution (letterboxing when aspect ratios differ) so the merged video plays smoothly. Matching resolution sources are kept at their original size.
Why does merging take longer than other tools here?+
To join clips reliably they must share identical codecs and settings, so each clip is re-encoded first. Processing time grows with the number and length of clips - the progress bar keeps you informed.
Are my clips uploaded anywhere?+
No. The entire merge - normalizing and joining - runs in your browser with FFmpeg compiled to WebAssembly. Your clips never leave your device.
How many clips can I merge?+
There is no fixed limit, but every clip must fit in your browser's memory during processing. A handful of typical phone clips works well; dozens of long videos may be too much for one session.
What if one clip has no sound?+
Silent audio is generated for clips without a soundtrack so the merged video stays in sync and the audio track remains continuous.
When to use this tool
- →Joining parts of a screen recording that saved as separate files
- →Combining phone clips from an event into one video to share
- →Stitching an intro, main content, and outro into a finished piece
- →Reassembling sections you trimmed from a longer video
- →Merging dashcam or camera segments into a continuous recording