Reaction video maker
A reaction video maker that survives the pause button
Load the clip, press record, react. OverReact records your camera against the source in the browser and rebuilds the sync through every pause, seek and restart — so the composite lands frame-accurate without you nudging a single track in an editor.
Every account starts with a 7-day full-Pro trial. No card required. Free stays free afterwards — with a 24-hour delete on anything you store.
- Layouts6
- Aspects9:16 · 1:1 · 16:9
- Project filesFCPXML · EDL · OTIO
- InstallNone
Recorded in one takeSource04:31.20
Camera06:12.04
Offset0 frames
What actually changes
Four decisions a reaction recorder should never force on you up front
- 01
Build the scene before you know what the take is.
Open a page, allow the camera, drag the clip in.
Nothing to configure → - 02
Line the two tracks up by ear, one nudge at a time.
The alignment is recorded while it happens, not guessed at afterwards.
How the timeline works → - 03
Pause once and every frame after it is offset.
Pause, rewind, walk away — the render still lands on the right frame.
Watch the proof → - 04
Change the layout and record the whole thing again.
Change the layout and re-render. The take never moves.
See all six layouts →
The whole workflow
Four steps, and only one of them is the part you were dreading
Most reaction tooling asks you to make the hard choices before you have watched anything. Here the only thing you commit to at the start is which video you are reacting to.
- 1
Load the source
~30sDrag in a video file, or start a browser capture and choose the tab yourself. Nothing is fetched on your behalf and the browser asks permission every time you capture.
- 2
Record the take
your takePress play and react. Pause to make a point, rewind to watch a beat again, stop and come back — every one of those is written into the timeline as it happens.
- 3
Pick the layout
~2 minNow that you have seen the take, choose how the frame divides. Preview each of the six against your real footage instead of guessing beforehand.
- 4
Export what you need
2–6 minThe composite for posting, the clean ISO tracks for cutting, and an FCPXML, EDL or OTIO timeline for the editor you already use.
One caveat worth stating before you start: OverReact never downloads anything from YouTube, TikTok or anywhere else on your behalf. A session begins with a file you already have, or with a browser capture you start yourself and approve in the browser's own permission prompt. Sourcing the material and holding the rights to it stays on your side of the line.
The part that is actually hard
Sync you record, not sync you rebuild
Waveform matching works right up until the source has no distinctive transient, or you clapped off-mic, or you paused halfway through. So the recorder writes the relationship down while it happens instead of reconstructing it later from two audio files and hope.
It records positions, not elapsed time
Every play, pause and seek is stamped with the wall clock and with the source's own playhead at that instant. Those two numbers are what make a composite reconstructable.
A pause is a gap the renderer knows about
Your camera keeps rolling while the source sits still. Because the stop and the restart are both in the timeline, the render holds your face against the frame you were actually looking at.
A backwards seek replays, it does not shift
Rewind ten seconds and the render puts that section of the source underneath the section of your camera that reacted to it — the second time through, not the first.
Pause + seek testLayout is a render decision
Six ways to divide the frame, chosen after you have watched the take
Nothing about how the video looks is baked into the footage. Switching from a corner circle to a top-and-bottom split costs a render, never a re-record.
Above the Fold
FreeSource top-center, reactor below full-width. The TikTok classic.
Corner Pocket
CreatorSource full-bleed, reactor circular PiP in any corner. Streamer classic.
Full Focus
CreatorYou full-frame; source rides as audio with an animated waveform + title card. Commentary format.
Green Room
CreatorYou full-frame, source floating in a rounded window. Green-screen style.
Sidecut
CreatorSource pinned left full-height, reactor right. Duet grammar.
Split Reaction
Creator50/50 split — source and reactor side by side, or two reactors.
What lands in your downloads
A finished video, and the raw material to change your mind
The composite is what you post. The ISO tracks and the project file are what let you re-cut it in three months without opening this site again.
- Final Cut Pro
- DaVinci Resolve
- Premiere Pro
- FCPXML
- EDL
- OTIO
- SRT
- MP4
Those are the formats we generate and test, so those are the only ones claimed. There is deliberately no CapCut project file — CapCut imports none of them. If CapCut is where you finish, the two-clean-tracks workflow is the honest route.
- reaction-9x16.mp4the finished composite, in the layout you chose
- iso/reactor.mp4your camera, no layout applied — Creator and up
- iso/source.mp4the source, untouched — Creator and up
- captions.srtsidecar captions you can restyle anywhere
- take.fcpxmlopens pre-synced in Final Cut Pro — Pro
- take.edlfor a Resolve conform — Pro
- take.otioOpenTimelineIO, for everything else — Pro
Editor handoffThe same take, opened in an NLE straight from the exported timeline.
Before you sign up
The questions people actually ask
If the answer you need is not here, the sibling pages go deeper: the full tutorial, the layout geometry, or what each plan costs.
Is there a free reaction video maker here?
Yes. Free gives you 720p exports, five-minute sessions, the Above the Fold layout and a “Made with OverReact” watermark. The one thing to know before you rely on it: on Free, recordings and exports are permanently deleted 24 hours after they are created. Download them the same day, or upgrade to keep them.
Do I have to install anything?
No. It runs in the browser and asks for camera and microphone permission the way a video call does. There is no desktop app, no plugin and nothing to keep updated.
Which browsers work best?
Chromium desktop browsers — Chrome, Edge, Brave, Arc — are the most capable, because they are also the ones that can share a tab's audio when you capture. Safari works for recording against an uploaded file. Mobile browsers can record but cannot share tab audio, so upload the file if the source sound matters.
Can I use my phone as the camera?
On Pro, yes. AirCam pairs your phone as a camera for the session and it records its own clean track like any other participant.
Can somebody react with me?
On Pro. A guest joins from their own browser and records locally, so you end up with a separate clean track per person rather than one flattened mix you can never unpick.
How long can a single session be?
Five minutes on Free, twenty on Creator, two hours on Pro and Founder Lifetime. Every account starts on a 7-day full-Pro trial with no card, so you can find out which one you actually need before paying for it.
Record something today
The sync either holds or it does not. Five minutes will tell you.
Start a session, pause the source halfway through, rewind it, and watch the export land on the right frame. On Free, recordings and exports are permanently deleted 24 hours after they are created. Download them before then, or upgrade to keep them.
Every account starts with a 7-day full-Pro trial. No card required. 14-day refund on your first charge. Cancel any time.
Not recording today?
Leave an address and we will tell you when a layout, an export format or a browser gets added. No drip sequence, no “our journey” newsletter.