GPTWATERMARKER is a web based tool designed to remove watermarks from images generated by Google Gemini, including those from the Gemini app, Nano Banana 2, Nano Banana Pro, and Google ImageFX. Its primary function is to strip three distinct types of markers that Google applies to its AI generated images: the visible sparkle logo in the corner, the invisible SynthID frequency watermark embedded in the pixel data, and the C2PA content credentials stored in the file header. The tool processes images directly in the user's browser for visible logo removal, while hidden watermark removal is handled through server side processing. The tool offers two main removal modes. The first mode removes the visible Gemini sparkle logo using reverse alpha blending, a mathematical technique that reconstructs the original pixels beneath the logo. This process is completed locally and instantly. The second mode removes the hidden SynthID and C2PA layers, which are not visible to the human eye but can be detected by automated systems such as stock libraries, social media platforms, and content moderation tools. Users must create a free account to use the service, with visible logo removal offered at a free daily allowance and unlimited removal available through a subscription. Hidden watermark removal requires the use of credits. Typical use cases include cleaning Gemini generated images for professional or personal use where the visible logo or hidden AI origin markers are undesirable. The workflow involves signing in, selecting the removal mode, uploading images in PNG, JPEG, or WebP format with no size limit and support for multiple files at once, processing the image, and downloading the result. Logo removal jobs provide an immediate download, while server processed jobs deliver a signed download link valid for one hour. The tool is built specifically for Gemini images and does not support watermark removal from other sources.