Put two to four videos in one frame: side by side, top and bottom, a row or a 2×2 grid. Trim each clip, line up their start times, loop the shorter one and choose whose sound you hear — rendered in your browser, no watermark.
Phone clips, reactions, before-and-after — MP4, MOV or WebM. Clip A comes first.
📺 Drop 2–4 videos here, or tap to choose
Rendered on your device with your browser’s video encoder — nothing is uploaded
Side by side, top and bottom or a grid — landscape, vertical or square.
MP4 (H.264) where your browser has an H.264 encoder, otherwise WebM. Usually faster than real time.
Tap the box and choose 2–4 videos. Clip A is the first tile; use ▲ ▼ to change the order.
Pick a Layout (side by side, top and bottom, row, big + small, or 2×2) and a Shape: landscape 16:9, vertical 9:16 for Reels/Shorts/TikTok, or square.
For each clip set Trim start/end, Starts at (to sync a reaction with the original), Volume, Mute and Loop if shorter. Press ▶ Preview to check.
Press 🎬 Create video. The video is rendered by your browser’s encoder; download it when the bar fills.
💡 Tip: Only clip A has sound on by default — two soundtracks at once is rarely what you want. Turn on the other clips’ sound (and lower their volume) for reaction or duet videos.
Vertical 9:16 with top-and-bottom is the standard layout for Reels, Shorts and TikTok; 16:9 side by side suits YouTube; square 1:1 works everywhere.
Most browser video tools either upload your clips or record them while they play, which takes as long as the video. AIMerger decodes every clip frame by frame with the browser’s WebCodecs engine, draws each frame of the collage and hands it to your device’s hardware encoder. A 30-second collage usually takes a few seconds. The result is an MP4 (H.264) in Chrome, Edge and Safari, or WebM where H.264 encoding is not available. Nothing is uploaded and there is no watermark.
Want clips one after another instead? The Video Merger joins them — losslessly, when they were shot with the same settings.
Add both videos above, choose the Side by side layout and a shape, then press Create video. Download the result when it is done — free and without a watermark.
Yes — choose the vertical 9:16 shape with the Top and bottom layout. Pick 1080p for the best quality.
Use “Starts at” on the clip that should begin later, and trim the start of the other. Press Preview to check before creating the video.
Tick “Loop if shorter” to repeat it; otherwise it holds on its last frame. You can also make the whole video as long as the shortest clip or as clip A.
Any video your browser can decode — usually MP4, MOV and WebM. The output is MP4 (H.264 + AAC) where your browser can encode H.264, otherwise WebM (VP9 + Opus).
No. Decoding, drawing and encoding all happen in your browser. Your clips never leave your device.
Everything on AIMerger brings things together — here is what pairs with this one.