Join multiple video clips into one, in the order you select them - processed entirely in your own browser. The video engine (~30MB) downloads once the first time you use any Video Tool, then stays cached.
Every clip is scaled to fit within a common 1280x720 frame (with black bars added if needed) before joining, so clips of different resolutions or aspect ratios can still be merged without cropping anything - this takes longer than a simple copy, especially for longer or higher-resolution clips. If any selected clip has no audio track (common for screen recordings), the tool automatically retries as a video-only merge instead of failing.