Gemini Watermark Remover

gemini-watermark.org is a fully client-side web tool for removing the visible watermark (the "sparkle" mark) from the bottom-right corner of Google Gemini-generated images and Veo-generated videos. The site is statically built with Astro, with interactivity confined to two hydrated Preact islands — the image tool on the homepage and the video tool on /gemini-video-watermark-remover.

All processing happens entirely in the browser; files never leave the device. The image pipeline runs in a Web Worker, using the gemini-watermark library to detect and remove the watermark, outputting lossless PNG with batch ZIP download support. The video pipeline builds on WebCodecs and mediabunny with a two-pass streaming design — the first pass calibrates the watermark's per-video alpha, the second removes it frame by frame and re-encodes to MP4, while audio is copied through without re-encoding. Only one decoded frame is held at a time to bound peak memory on phones.

The product is committed to honesty: it removes only the visible watermark and never touches the invisible SynthID; video output is transparently described as re-encoded rather than lossless; no Google/Gemini brand assets are used, and the site explicitly states it is not affiliated with Google. It is mobile-first with SEO as the core growth channel, tracks conversion through GA4 funnel events (process start/done/download), and the video feature is currently "Free during launch".