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Reaction videos, tutorials with a face cam and two-angle recordings all use the same trick: a small video floating over a larger one. Pick the main video and the overlay, drag the overlay where you want it, line up the timing and choose whose audio you hear. The compositing happens on your own computer.
Processing locally on your device
Overview
Picture-in-picture (PiP) places a scaled-down second video on top of a full-frame main video. Start with the main, or background, video, then add the overlay: usually a webcam recording, a reaction, or a second camera angle. The overlay keeps its own aspect ratio and is sized as a percentage of the main video’s width, from 10% to 50% (30% by default).
Snap the overlay to any of the four corners with a margin of 0–120 pixels from the edges, or drag it anywhere on the preview; arrow keys move it in 1% steps, or 5% with Shift. An optional border of up to 20 pixels in any colour helps the overlay stand out from busy footage. If the two recordings didn’t start at the same moment, the Overlay starts at slider delays the overlay so the two line up, for example after matching a clap or a cut in both clips.
For audio, choose the main video’s sound, the overlay’s sound, or a mix of both, with separate volume controls from 0 to 200%. If the selected video has no audio track, the tool tells you what was used instead. The result is always as long as the main video: if the overlay ends first, the main video simply carries on alone. The preview plays both videos in sync, with volume capped at 100%.
The final video is composited by FFmpeg 5.1 compiled to WebAssembly, so both files stay on your device. The output is an MP4 at the main video’s resolution with H.264 video (CRF 21) and AAC audio. Compositing decodes two videos and re-encodes every frame on a single thread, so a minute of 1080p can take a few minutes on a typical laptop. The engine is a one-time download of about 31 MB that your browser caches.
| Size setting | Overlay pixels | Good for |
|---|---|---|
| 10% | 192 × 108 | Small logo-like cam |
| 20% | 384 × 216 | Gameplay facecam |
| 30% | 576 × 324 | Tutorials, reactions |
| 50% | 960 × 540 | Two-angle comparisons |
Drop the main (background) video into the tool.
Add the overlay video, such as a face cam or reaction clip.
Set the overlay size, then pick a corner or drag it into place on the preview.
Add a border and shift the overlay start time if the recordings need syncing.
Choose main, overlay or mixed audio and adjust the volumes.
Click Create picture-in-picture and download the MP4.
Use cases
Put your webcam reaction in a corner over the clip you are reacting to, mix both audio tracks and lower the original so your voice comes through.
Combine a screen recording and a separate webcam file into one video, with the presenter in the bottom-right and a thin white border.
Overlay a facecam on gameplay recorded separately by a console or capture card, and use the start offset to line them up.
Show a close-up of hands, an instrument or a product in a small window while the wide shot plays full-frame.
Pro tips
Answers to common questions about the picture-in-picture.
Exactly as long as the main video. If the overlay is shorter it disappears when it ends; if it is longer, it is cut off at the end of the main video.
Yes. The Overlay starts at slider delays the overlay, and its audio, by any amount up to near the end of the main video.
No. The overlay is a rectangle that keeps its own aspect ratio. Crop the overlay first with the Video Cropper if you want a square or tighter framing.
The tool uses whichever audio exists and shows a note explaining it. If neither video has audio, the result is silent.
The main video’s resolution, rounded to even numbers. The overlay is scaled to the size you choose within that frame.
No. ToolEnhancer processes files on your own device inside the browser. They are never sent to, stored on or seen by our servers.
Yes. The picture-in-picture is free to use with no sign-up, no watermarks and no daily limits.