How to use
- On the Images tab, drop your pictures or a whole folder onto the box, or use Choose images or Choose folder. Subfolders are included.
- Each image is cleaned one after another: the Gemini sparkle in the bottom-right corner is removed when it is found, and all metadata, including C2PA Content Credentials, EXIF and XMP, is dropped.
- Download images one by one, or click Download all (ZIP). The ZIP keeps your folder structure and adds -clean to each file name.
- On the Text tab, paste text to see which hidden characters it contains, then click Copy clean text.
How the Gemini watermark is removed
Images made with Google Gemini (Nano Banana) carry a white four-point sparkle in the bottom-right corner. It is blended in at up to about 50% opacity: a 48-pixel mark 32 pixels from the edges on smaller images, and a 96-pixel mark 64 pixels from the edges when both sides are over 1,024 pixels.
Because the exact shape and opacity of the sparkle are known, the original pixels can be worked out instead of guessed: original = (shown − opacity × 255) ÷ (1 − opacity). In our tests on a recreated Gemini mark, the restored corner matched the untouched picture to within 1 step out of 255. The tool first checks that the sparkle is really there, so pictures without it are left as they are.
What AI metadata is in an image
Many AI image tools add C2PA Content Credentials, a signed record of how the image was made, along with EXIF and XMP fields that can name the generator. The cleaner draws each image onto a canvas and saves it again, which keeps only the pixels, so every metadata block is left behind. The list shows which kinds each file carried.
| Mark | Where it is | Removed here |
|---|---|---|
| Gemini sparkle | Visible, bottom-right corner | Yes, restored pixel by pixel |
| C2PA Content Credentials | Metadata block in the file | Yes |
| EXIF and XMP fields | Metadata block in the file | Yes |
| SynthID and other invisible pixel watermarks | Spread through the pixels | No: needs AI regeneration on a GPU |
| Hidden Unicode characters in text | Between letters | Yes, on the Text tab |
Hidden characters in AI text
Text copied from chatbots and web pages can contain characters you cannot see: zero-width spaces and joiners, text direction marks, invisible tag characters and unusual spaces such as non-breaking or narrow spaces. They can break code, search and word counts, and some are used to mark text. The Text tab lists each one by code point, removes the invisible ones and turns unusual spaces into ordinary spaces.
Emoji are kept intact: the variation selectors that choose emoji or text style (U+FE0E and U+FE0F) are not removed.
Frequently asked questions
How do I remove the Gemini watermark?
Download the original image from Gemini (not a screenshot), drop it on the Images tab and keep Remove the Gemini sparkle when found switched on. The tool finds the sparkle in the bottom-right corner, restores the pixels underneath and removes the C2PA metadata Google adds. Download the cleaned file, or drop a whole folder and download a ZIP.
Is it legal to remove an AI watermark?
Removing marks from images and text you created yourself is generally fine, for example to tidy an image for a slide or a print. Do not use it to pass off AI images as real photos where disclosure is required, and do not remove watermarks that protect someone else's paid work. Some places, including China, restrict removing AI labels, so check the rules where you publish.
Are my images uploaded?
No. Everything runs in your browser on your own device, which also means a large folder is limited only by your computer's memory.
Does it remove SynthID?
No. SynthID is spread invisibly through all the pixels and can only be disrupted by regenerating the image with an AI model on a graphics card. This tool removes the visible sparkle and the metadata, which are what most viewers and upload checks look at.
Why was no sparkle found on my Gemini image?
The sparkle is found by its exact size and position. If the image was cropped, resized to an unusual size or screenshotted, the mark no longer matches and the tool leaves the image alone rather than risk damaging it. Metadata is still removed.
Does cleaning lower the image quality?
PNG files are saved without any loss. JPG and WebP files are saved again at 95% quality, which is very hard to tell apart from the original.
