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Ideally, videos share the same format, resolution and framerate for a homogeneous result. Merging automatically realigns streams, but overly different formats (720p + 4K) yield an unbalanced result.
Free, no account required, browser processing and no server upload.
Drop a file — Merge videos
Drag and drop your file here · Choose a file from your device
Max 100 Mo
Ideally, videos share the same format, resolution and framerate for a homogeneous result. Merging automatically realigns streams, but overly different formats (720p + 4K) yield an unbalanced result.
Risks by difference
Different resolutions
The smaller video is stretched or has black bars
Different framerates
Stuttering or audio desync
Different codecs
Transcoding needed, degraded quality
Practical advice: first convert all videos to the same format with "Convert video", then merge.
Merge videos helps you complete this task directly in your browser. You keep control of your data and get the result locally.
Yes. Merge videos is free to use and runs in your browser without sending files or content to Lmaotools servers for processing or storage.
No. Files and content added to the tools are processed in your browser. They are not sent to Lmaotools servers for conversion or storage.
No. Open the tool, add your file or content, then get the result. Processing happens locally in your browser.