How to use Merge videos
- Choose the first video.
- Choose the second video.
- Download the merged MP4.
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
Combine intro and main clip
Merge a short intro video with your main recording before sharing.
Join two phone clips
Combine two short video messages into one longer file for easier sharing.
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.
Frequently asked questions
Can I merge more than two videos?
This tool merges exactly two videos. For longer sequences, you can merge pairs step by step.
Will the videos have the same resolution?
The output uses the first video's settings. For best results, use videos with similar resolution and frame rate.
Is my file uploaded?
No. Both videos are processed locally in your browser using WebAssembly.
Troubleshooting
The merged video has black bars or looks stretched.
Use two videos with the same resolution and aspect ratio for best results.
The export is slow.
Longer combined durations take more time. Try with shorter clips first to verify the workflow.