offlinewebtools.com — free, watermark-free browser tools that stay on your device with nothing uploading to our servers

Join Videos

Concatenate multiple video files into a single continuous video with synchronized audio and transitions.

Free to use, no watermarks, runs in your browser—nothing uploads to our servers

Source file

Files are processed locally in your browser using WebAssembly.

Saved FFmpeg presets (stored locally)

Saved presets

Preset name

Note: This tool requires uploading multiple video files. Current implementation is limited to single file input. Use desktop video editing software for joining multiple videos.

Jump to helper sections

What video formats can I join?

You can join videos of different formats (MP4, MKV, AVI, etc.), but they should have similar resolution and frame rates for best results.

Will there be quality loss?

Videos are re-encoded during joining, which may result in minimal quality loss. For lossless joining of identical format videos, use specialized tools.

Can I join videos with different resolutions?

Yes, but the output will scale videos to match. For best quality, ensure all input videos have the same resolution before joining.

Report a bug

If this tool misbehaves, share a quick summary so we can investigate. We include the tool URL automatically—no need to copy and paste.