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What this tool does

The merge tool combines two video files into a single MP4. It is useful when you want to join clips from different recordings, append an intro or outro, or combine two short segments into one longer video.

The first video sets the output format and resolution. Both videos are re-encoded into a single MP4 for compatibility.

How browser processing works

Both video files are loaded into your browser and processed with FFmpeg WebAssembly on your device. No files are uploaded to a server.

Processing time depends on the combined length of both videos, device performance, and browser.

Supported formats and output

Input

Two browser-readable video files such as MP4, MOV, WebM, and other formats supported by FFmpeg.

Output

A single MP4 containing both videos joined in order.

Practical examples

Quality considerations

• For seamless merging, use videos recorded with the same device and settings.
• If quality matters, avoid mixing heavily compressed sources with high-quality ones.

Limitations

• Exactly two files are required.
• The output uses the first video's resolution and frame rate. Mismatched dimensions may cause black bars or scaling.
• Very long combined videos can exceed browser memory limits.