MediaMerger

Free. Runs in your browser.

Several clips, one video. Drop them in, drag to reorder, trim if you like, press merge.

Quick Merge glues matching clips together in seconds with no quality loss.
Re-render handles clips of different sizes and frame rates by putting them on one canvas.
A join-points strip shows the last frame of each clip next to the first frame of the next, so you catch a wrong order before you render.
Runs in your browser. Nothing is uploaded, and it works offline.

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Why I ask: I might reach out with a question about how to improve this tool, or to mention other cool tools I build. I will never give your email address to anyone else. You only have to do this once per browser.

Want to see what it does first? Read the help page.