Compare takes, make reaction videos or show before and after. Arrange two clips side by side or stacked, keep them in sync and export the composition.
Load two clips to begin.
Runs entirely in your browser. Nothing is uploaded to any server.
Show two takes, edits or products side by side so viewers see differences instantly.
Export landscape for YouTube, portrait for Shorts and Reels, or square for feeds.
Arrange, preview and export in one page without installing anything.
Both clips play in hidden video elements while a canvas draws each one into its half of the frame, cropped to fill or letterboxed to fit. Every half second the tool checks whether clip B has drifted from clip A and nudges it back, so the two stay in sync during preview and recording.
Recording uses the canvas capture stream and MediaRecorder, mixing the selected audio through the Web Audio API. Export runs in real time, so a one-minute composition takes about a minute. Keep the tab visible while recording because browsers slow down background tabs.
Fill crops each clip to remove bars; fit keeps the whole frame with letterboxing.
Offset either clip so the moments you want line up exactly.
Use one clip's sound, blend both, or export silent.
No. Both clips play locally and are composed on a canvas in your browser.
Browsers record canvases with MediaRecorder, which produces WebM in most browsers (some produce MP4). Convert to MP4 with any converter if needed.
Choose whether recording stops when the shorter clip ends or continues until the longer one ends, holding the last frame of the shorter clip.
Yes. Choose "Both" and each clip is mixed at 70% volume to reduce clipping.
High-resolution sources and large output sizes are demanding. Try 1280 x 720 output and keep the tab in the foreground.
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