Side by Side Video
Show clips at the same time in one frame: a reaction next to the original, a before and after, or four angles in a grid. Clips are matched to the same height or width.
- Nothing is uploaded
- Free, no sign-up, no watermark
- Works offline once loaded
Drop your videos here
or choose files, or paste
MP4, MOV, WEBM, MKV, AVI, M4V, 3GP, FLV, WMV and more. Up to 4 files.
Processed on your device. Nothing is uploaded.
How to use Side by Side Video
- 1
Add two to four clips
Drop the videos on the drop zone. Drag them into the order they should appear, left to right or top to bottom.
- 2
Choose the layout
Pick Side by side, Stacked, or 2 x 2 grid (four clips).
- 3
Choose sound and length
Under Sound pick First clip, Mix all or None. Under Length choose Shortest clip or Longest clip.
- 4
Combine and download
Press Combine videos, follow the progress, then Download the MP4.
Why use Aback Video for this
Three layouts
Side by side for reactions, stacked for vertical comparisons, and a 2 x 2 grid for four angles.
Automatic matching
Clips are scaled to the same height or width so the edges line up without gaps.
Sound your way
Use the first clip's sound, mix every clip together, or keep it silent.
On your device
Your clips are combined in the browser and never uploaded.
Frequently asked questions
What happens if the clips are different lengths?
With Shortest clip, the video ends when the shortest clip ends. With Longest clip, it runs until the longest ends and the shorter clips hold their last frame.
Can I put a vertical and a landscape clip side by side?
Yes. In Side by side layout both are scaled to the same height, so the vertical clip simply takes up less width.
How large is the output?
Side by side doubles the width, Stacked doubles the height. To keep it reasonable, very large combinations are scaled down so neither side exceeds about 4K.
Is anything uploaded?
No. The clips are combined locally with FFmpeg in WebAssembly.
Why does it take a while?
Several videos are decoded and one larger video is encoded on a single thread in the browser. Short clips finish quickly; long ones take a few minutes.
Does it work on phones?
Yes for short clips. Combining several long high-resolution videos needs a lot of memory, which phones may not have.