Editor
Tessa Ostrowski
Editor, video checks and guides
What Tessa covers
Tessa Ostrowski writes the guides on AI Video Detector and edits everything that explains the free check. Her beat is the moment after you have watched a clip and something felt wrong: what to pause on, what to zoom into, and what the platforms themselves tell you about a video's origins.
Her guides lean on the visible tells first. Hands that change finger count between frames, text on signs that melts into shapes, reflections that do not match the room, a watermark that has been cropped half off. She writes them so you can check a clip on your phone in a minute, without special software.
Her rule for every guide is the same one the checker follows: show the evidence, not just the conclusion. If a guide says a clip shows a tell, it says where in the frame to look. If a guide says a platform labels AI video, it links to the platform's own policy page. And no guide treats a clean result as proof that a clip is real, because it is not.
She also covers the labels and marks that travel with some AI video: the visible watermark on clips from some generators, invisible marks such as Google's SynthID, and the AI labels that platforms add. Each of those facts links to the company page that states it, so you can open the source and read it yourself.
Tessa keeps the comparison of free AI video detectors dated and sourced. Every tool in it is described only by what its own site documents, on the date checked, with no accuracy figures for anyone.
How pages are updated
Platforms change their labels and tools change their free tiers, often without announcing it. Tessa revisits each guide when one of its sources changes, and the comparison page whenever a listed tool changes its free limits.
When a page changes, its updated date changes with it. When nothing has changed, the date stays put. Corrections from readers go to the same place as everything else, the contact page, and a fixed page shows its new date. The about page sets out the rules every guide follows.
Guides by Tessa
- How to Tell If a Video Is AI: 9 ChecksNine things to check by eye, from hands and text to lighting and the source of the upload.Updated
- How to Spot AI Video: The Visual TellsThe visual tells, with annotated frames showing where to look.Updated
- The Sora Watermark: What It Is and What It ProvesWhat the visible mark looks like, why cropping matters, and what its absence does and does not mean.Updated
- SynthID Explained: How to Check Google AI VideoWhat Google's invisible watermark is and where you can check for it.Updated
- Best AI Video Detectors, ComparedSeven free and freemium tools side by side, with the same fields for each and the date every value was checked.Updated
To check a clip right now, use the free AI video detector on the home page.
More about the site on the About page. To reach Tessa, see Contact.