SynthID, explained
What “remove SynthID” really means
There are two different watermarks on AI images and videos: the visible logo you can see, and SynthID, which you cannot. Unmark cleans the first and is honest that the second cannot be removed.
Removable
Visible logo
The Gemini star / Veo diamond in the corner
A fixed, semi-transparent pixel overlay blended into the corner. Because the blend is deterministic, it can be mathematically reversed — which is exactly what Unmark does, losslessly and in your browser.
Not removable
SynthID
Google’s invisible provenance watermark
A signal distributed across the image in a learned, high-dimensional space — not a fixed pixel pattern. It is designed to survive compression, cropping, resizing, and color grading, and there is no reliable, quality-preserving way to strip it with public tools today.
Why SynthID survives editing
A visible watermark is just a logo painted on top of the picture with a known transparency. If you know the logo and the transparency, you can solve the blend equation backwards and recover the original pixels. That is a clean math problem, and it is the one Unmark solves.
SynthID is a different kind of thing. Instead of one fixed mark in one corner, it spreads a subtle, learned pattern across the entire image or video. It is trained to stay readable even after the file is recompressed, cropped, resized, or color-graded. There is no single region to subtract and no published, reliable method to erase it without visibly degrading the result — so we do not pretend to.
SynthID FAQ
Can Unmark remove SynthID?
No. Unmark removes the visible Gemini/Veo logo only. SynthID is an invisible, adversarially-trained signal embedded across the whole image or video, and no public tool can remove it without significant quality loss. We would rather tell you that plainly than imply otherwise.
Does SynthID affect how my image looks?
No. SynthID is imperceptible to the human eye and does not change the visible quality of your image or video. It only carries provenance information that detectors can read.
Then what is the point of removing the visible watermark?
The visible corner logo is what shows up in your decks, mockups, storyboards, and exports. Removing it gives you a clean frame for design and reference work. SynthID remains untouched — that is a deliberate, honest boundary.
Is SynthID present on Veo and Flow videos too?
Yes. Google applies SynthID across Gemini images and Veo / Flow videos regardless of tier. The visible "Veo" / Gemini diamond watermark is separate, and that visible mark is what our video remover targets.