Guides
Notes on how the Gemini, Veo and Gemini Notebook watermarks are actually put together, what it takes to lift one off without inventing pixels, and where the method stops working. Written while building the tool, from measurements rather than guesswork.
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How the Gemini watermark works, and why it is reversible
Gemini composites its mark with ordinary alpha blending. That leaves one unknown in the equation, and it is the pixel you want back.
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Every official Gemini image output size
Gemini does not emit arbitrary dimensions. The full catalogue of sizes for Gemini 3.x and 2.5 Flash Image, by aspect ratio and resolution tier.
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Where the Gemini watermark sits at each resolution
Logo size and margin for every resolution tier, the large-margin variants, and why an off-catalogue crop moves the mark out from under the tool.
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SynthID and the visible watermark are not the same thing
Google marks generated media twice. Removing the corner logo does not touch the imperceptible signal, and it was never going to.
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Why AI inpainting is the wrong tool for a known watermark
Generative fill invents plausible pixels. When the mark and its alpha map are both known, the original pixels can be recovered instead of guessed.
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How the Veo watermark is positioned in video
The 1080p reference layouts, the 720p variants that do not simply scale from them, and how a candidate position is projected to other frame sizes.
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The Gemini Notebook wordmark is a different problem
Gemini Notebook, formerly NotebookLM, stamps its wordmark on video, not the sparkle. It is opaque, not on every frame, and drawn differently in portrait.
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What WebCodecs can and cannot do in the browser
Why video watermark removal needs Chrome or Edge, what Safari and Firefox are missing, and what changes when a browser gains H.264 encoding.
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Measuring what a browser re-encode costs you
A PSNR study of Chrome software H.264: where the real ceiling sits, and the one-line content hint that quietly cost four decibels.
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Why cleaning a video means re-encoding it
You cannot edit a pixel inside a compressed frame without decoding it first. What that costs, what is kept untouched, and how to keep the loss small.
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Why a file sometimes comes back unchanged
The tool declines rather than damaging a corner it cannot identify. What trips the confidence gates, and what to do about each case.
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Removing a watermark from your own work, and where the line is
The mark is a provenance signal. Taking it off work you generated is not the same as passing generated media off as something it is not.