Browser-based comparison video generator using ffmpeg.wasm. Place two videos side by side and create a comparison video that plays simultaneously.
Perfect for quality comparisons, before/after verification, product comparisons, and various other purposes.

Main Use Cases

Video quality comparison verification

Before and after editing confirmation

Product review videos

Before and after verification

Encoding settings comparison

Filter effect confirmation

Diet and fitness progress tracking

Construction and project progress comparison

Game gameplay comparison videos

Educational content comparison materials

Q&A

What happens if the videos have different lengths?

The output will match the length of the shorter video. The longer video will be cut off.

What is the output size?

The output will be the combined size of both videos placed side by side.

Does it work on mobile devices?

Yes. It works on mobile browsers including iPhone and Android. *Some OS or browser versions may not be supported.