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Demarker

For images you made with Gemini or Nano Banana

Gemini watermark remover

Paint the visible Gemini sparkle out of your own images, and see the hidden marks it leaves behind. The scan is free, and so are 3 Quick cleans a day.

  • Originals deleted 24 h after your last run finishes, or after upload if you never process (up to 72 h while awaiting payment)
  • Never used for training
  • Credits back on failure

Not affiliated with or endorsed by Google. Gemini and Nano Banana are Google products. Use on images you own or have the right to edit.

A Gemini image carries three marks, not one

The sparkle is the one you can see: a small star logo that Gemini draws onto the picture. Whether it appears depends on how you made the image and on Google's current settings, so Google's help pages are the place to check your plan.

The second mark is SynthID, a watermark that Google adds to the pixels of images made with its AI tools. You cannot see it, and it is not a field in the file, so there is nothing to delete. The third is C2PA Content Credentials, a signed record in the file that says how the image was made.

Google's own help says its watermark setting only affects the visible mark, and that SynthID and Content Credentials stay. The same is true of any tool that only removes the sparkle. That is why this page starts with a scan: it shows you which of the three your file actually has before you decide what to do about it.

What a Quick clean does to a Gemini image

Quick clean looks for the Gemini sparkle among the visible marks we recognise and paints it out. It also strips AI provenance metadata, which includes the C2PA record, and keeps creator and copyright fields. It is free 3 times a day on the web, and output is up to 12 MP. Larger images are downscaled to 12 MP unless you pay 2 credits for original size.

We only paint out marks we recognise. If the image has been resized, cropped or re-saved since Gemini made it, the sparkle may have moved or changed, and the scan may not find it. In that case the report says so instead of guessing.

Because the sparkle sits on top of real picture content, the area under it has to be rebuilt. On a plain background that is easy. On a busy, detailed corner you may see a soft patch, so use the before and after slider and keep your original.

Nano Banana, Imagen and Google AI Studio images

Nano Banana is Gemini's image model, so its images carry the same three marks. Images made through other Google AI tools can carry some of them too. We do not need to know which tool you used: the scan reads what is in the file, and the report lists the signals it found.

If the report finds a Google generator in the metadata, it flags a likely hidden watermark. That is an inference from the file. We cannot decode SynthID, so a scan that finds nothing never means an image is clean.

If the scan points to a hidden watermark

Quick clean does not touch SynthID. For that there is a GPU pass, which redraws the image to disrupt pixel watermarks. It is best effort, it can change fine detail such as faces, and we cannot promise a result. A GPU pass costs 10 credits at up to 12 MP and 15 credits above that. The Single pack is 10 credits for $1.49, so one GPU pass on a standard image is $1.49. Credits are one-time packs, not a subscription.

If the GPU pass did not work for you, tell us on the result page: it gets one free re-run within 23 hours, and if processing fails your credits come back. Our SynthID page explains exactly what the pass does and does not do.

How it works

Four steps. The first is free.

  1. 1

    Drop your image

    PNG, JPG, WebP or AVIF, up to 25 MP. You can scan without an account.

  2. 2

    Read the report

    It lists visible marks, AI metadata and the hidden watermarks it can infer. Nothing is changed and nothing is charged.

  3. 3

    Run a Quick clean

    Choose Quick clean to paint out the sparkle and strip AI metadata. Free, 3 a day.

  4. 4

    Compare and download

    Slide between before and after, see what was removed and what stayed, then download the new file.

Honest limits

What it does, and what it does not.

Read this before you pay for anything.

  • Scans your image and lists every visible mark, AI tag and inferred hidden watermark
  • Paints out the Gemini sparkle where it recognises it
  • Strips AI provenance metadata and keeps creator and copyright fields
  • Shows before and after so you can judge the result
  • Deletes your original 24 hours after the last run on it finishes, and never uses images for training
  • Remove SynthID with a Quick clean. Only the GPU pass tries, and it cannot promise a result
  • Read or decode SynthID, so a scan with no signals is not proof the image is clean
  • Edit video. It is images only for now
  • Remove stock, marketplace or third-party marks, or marks on images you do not own
  • End your duty to label AI content where a law or a platform requires it

Prices and the free limits are on the pricing page.

FAQ

Questions

Can the Gemini watermark be removed?

The visible sparkle can, if the image still has it in a recognisable form. The scan tells you whether it found one. The hidden SynthID watermark and the C2PA record are separate: a Quick clean strips the C2PA record, and only the GPU pass tries to disrupt SynthID.

Is removing the sparkle also removing SynthID?

No. Google says its watermark setting only affects the visible mark and that SynthID stays. A tool that removes the sparkle leaves the SynthID signal in the pixels.

How do I remove the Gemini watermark for free?

Scan the image, then run a Quick clean. Quick clean is free up to 3 times a day on the web, with output up to 12 MP.

Does it work on Nano Banana images?

Yes. Nano Banana is Gemini's image model and its images carry the same visible sparkle, hidden watermark and Content Credentials. The scan reads the file, so you do not need to tell us which tool made it.

Will the picture look different afterwards?

The area under the sparkle is rebuilt, so on a detailed corner you may see a soft patch. Use the before and after slider, and keep your original. A clean is a new file and the file you uploaded is never changed.

Why did the scan not find a sparkle?

The image may never have had one, or it may have been cropped, resized or re-saved so that it no longer matches what we recognise. The report states what it found and what it could not check.

Can Google still tell the image came from Gemini?

It may be able to. SynthID lives in the pixels and is built to survive common edits, and Google controls the detector. We cannot read SynthID, so we cannot tell you what Google's tools would say. Removing the visible sparkle does not change that.

Is this allowed?

Use it on images you made or have the right to edit, and you confirm that before each clean. Some places, including the EU, China and India, require AI-generated content to be labelled in certain cases, and removing a mark from a file does not remove that duty. We refuse stock and third-party marks, and the service is not available in mainland China.

Does it work on Gemini videos?

No. It is images only for now.

What happens to my image?

Files are processed on our servers, not in your browser. Originals are deleted 24 hours after the last run on them finishes, or after upload if you never process. We never use images for training.

Related

Other marks in the same file.

  • SynthID remover

    The hidden watermark in the pixels, and what a GPU pass can and cannot do about it.

  • Remove AI metadata

    C2PA Content Credentials, prompts and generator tags in the file.

Scan your image for free.

The scan costs nothing, and so do 3 Quick cleans a day. For images you own or have the right to edit.