Join Videos
Combine several videos into one MP4 in the order you choose, even if they differ in size or frame rate.
Free · No upload · 100% on your device
Join Videos
Choose videos, or drop them here.
MP4, MOV, MKV, WebM, AVI and more · No size or length limit. Nothing is uploaded.
100% on your device
How to use Join Videos
- Choose your videos, or drop them on the page.
- Pick the settings in the side panel.
- Select “Join videos”. The first use downloads the video engine once.
- Download the result. Your original file is left unchanged.
Private by design. Your files are processed in this browser tab and are never uploaded to KittySuite.
About Join Videos
Put the clips in order with the arrows. When every clip has the same format, size and frame rate, they are joined without re-encoding. Otherwise every clip is fitted to the size of the first one, with black bars where the shape differs, and clips without sound get silence so the audio stays in sync.
Processing happens in this tab with FFmpeg compiled to WebAssembly; your files are never uploaded. The first video or audio tool you use downloads the 10 MB engine once and keeps it cached for next time. Long or high-resolution videos take longer than on a desktop editor, especially on phones, where files are processed one at a time to stay within memory. Keep the tab open until the download appears.
Join Videos: frequently asked questions
How do I join videos together?
Choose the clips, put them in order with the arrows and join them. The result is one MP4.
Can I join videos of different sizes or frame rates?
Yes. Every clip is fitted to the size of the first, with black bars where the shape differs.
Is the quality kept?
When every clip has the same format, size and frame rate, they are joined without re-encoding. Otherwise they are re-encoded to match.
What if one clip has no sound?
Silence is added for it, so the audio stays in sync across the joined video.