Browser tab: 7, Title: "Gemini Watermark Remover — Runs in Your Browser", URL: "https://watermarkundo.com/".
0 AXWebArea Gemini Watermark Remover — Runs in Your Browser, URL: watermarkundo.com/
	1 container
		2 container Main navigation
			3 link Description: WatermarkUndo, Value: watermarkundo.com/
			4 link Description: Tool, Value: watermarkundo.com/
			5 link Description: Guide, Value: watermarkundo.com/#how-to-use
		6 heading Gemini Watermark Remover, Value: 1
			7 text Gemini Watermark Remover
		8 text Remove the visible Gemini sparkle watermark from images in your browser and download a cleaned PNG; your image stays on your device.
		161 button Description: Choose a Gemini image, ID: dropzone
			162 text Drop a Gemini image here, or tap to choose
			163 text Reads anything your browser can decode — PNG, JPG, WebP, AVIF, GIF.
		12 container how-to-use
			13 heading Add your image and check the watermark’s position, Value: 2
				14 text Add your image and check the watermark’s position
			15 text Remove the visible Gemini sparkle locally in your browser and download a cleaned PNG; your image stays on your device.
			16 text The tool currently handles images. Video is not supported.
			17 text Drop your image onto the tool page or tap to choose it; no registration is required and there is no daily usage limit.
			18 text Choose an image your browser can decode. The homepage lists PNG, JPG, WebP, AVIF, and GIF as examples.
			19 text WatermarkUndo targets the visible Gemini sparkle at Gemini’s standard placements. If the mark sits somewhere else, use the nudge sliders to adjust the cleanup position.
			20 text A mark outside the usual placement calls for the documented nudge controls before you judge the cleanup result.
		21 container watermark-controls
			22 heading Set the watermark size, position, and removal strength, Value: 2
				23 text Set the watermark size, position, and removal strength
			24 text The homepage’s tool panel contains these labels and instructions:
			25 text Watermark size
Auto — detect from image dimensions
96 × 96 px
48 × 48 px
Auto follows Gemini's own placement: 96 px with a 64 px margin on images larger than 1024 px on both sides, otherwise 48 px with a 32 px margin.
Nudge horizontally 0 px
Nudge vertically 0 px
Removal strength 1.00×
Scales the watermark's opacity before the reverse blend. Lower it if a dark halo appears, raise it if a faint ghost of the sparkle is left behind.
Show the watermark box on the result
			26 heading Let Auto choose the size from both image dimensions, Value: 3
				27 text Let Auto choose the size from both image dimensions
			28 container
				29 text Auto uses the 96 × 96 px watermark with a 64 px margin when  both the image width and height are greater than 1024 px . Otherwise, it uses the 48 × 48 px watermark with a 32 px margin.
			30 text Both dimensions matter. If either side is 1024 px or smaller, the stated Auto rule selects the smaller watermark. The size menu also provides the two explicit size options shown above.
			31 heading Correct placement with the horizontal and vertical controls, Value: 3
				32 text Correct placement with the horizontal and vertical controls
			33 container
				34 text If the sparkle is away from its standard placement, use  Nudge horizontally  and  Nudge vertically  to adjust the cleanup position along the corresponding axis. Their displayed starting values are 0 px.
			35 container
				36 text Use  Show the watermark box on the result  to inspect the cleanup region while checking its alignment with the sparkle.
			37 heading Adjust strength to match the remaining artifact, Value: 3
				38 text Adjust strength to match the remaining artifact
			39 container
				40 text The panel displays  Removal strength 1.00× . This control scales the watermark’s opacity before the reverse blend.
			41 container
				42 text Follow the panel’s direction:  lower the strength if a dark halo appears; raise it if a faint ghost of the sparkle remains . These symptoms call for opposite adjustments, so increasing strength is not the answer to every imperfect result.
			43 text My practical recommendation is to consider manual retouching if correcting the placement and following the documented strength guidance still leaves an unacceptable result. That is an editorial stopping recommendation, not an additional rule stated by the tool.
			44 text Judge the saved picture by the area you needed to fix. Accept the result when that area is suitable for your intended use.
		45 container cleanup-method
			46 heading Understand what the tool changes, Value: 2
				47 text Understand what the tool changes
			48 text WatermarkUndo reverses the blend between the image and the semi-transparent white sparkle. It uses the watermark’s alpha map and the formula published on its homepage:
			49 text original = (watermarked − alpha × 255) / (1 − alpha)
			50 text This formula describes the cleanup method, not an accuracy percentage.
			51 text The homepage states that pixels outside the watermark box remain untouched. Image dimensions stay unchanged, and the surrounding image’s pixel values are preserved in the PNG output.
			52 text The download is always PNG, so saving the cleaned result does not introduce another round of lossy compression.
		53 container Ground-truth restoration tests, ID: restore-tests
			54 heading Ground-truth restoration tests, Value: 2, ID: restore-title
				55 text Ground-truth restoration tests
			56 text 4 owner-provided Gemini originals had no visible sparkle. Inputs below use our exact alpha map; outputs were processed once by the live tool. Three Auto48 cases; one Manual96 case, not Auto96. Not native watermarked downloads, a success rate or a claim about all images. SynthID, metadata and mobile processing were not tested.
			57 text Resized display previews, not pixel-level evidence. Select Original, Composited input or Tool output to download the unchanged full-resolution file for comparison.
			58 container
				59 heading Light product 1024 × 1024 · Auto 48 px · 2026-10-18, Value: 3
					60 text Light product 1024 × 1024 · Auto 48 px · 2026-10-18
				61 link Description: Light product — Original Original ↓, Value: watermarkundo.com/gemini-original-2026-10-18-vase.jpg
				62 link Description: Light product — Composited input Composited input ↓, Value: watermarkundo.com/composited-input-2026-10-18-vase.png
				63 link Description: Light product — Tool output Tool output ↓, Value: watermarkundo.com/cleaned-2026-10-18-vase.png
				64 text Max 1/255 · MAE 0.00 (rounded) · different pixels in/out 620/0
				65 text Box (944, 944), 48 × 48 · box MAE 0.17 · input changed 883 pixels. Gemini original → same-map input → live output; errors vs original.
			66 container
				67 heading Detailed interior 1376 × 768 · Auto 48 px · 2026-10-18, Value: 3
					68 text Detailed interior 1376 × 768 · Auto 48 px · 2026-10-18
				69 link Description: Detailed interior — Original Original ↓, Value: watermarkundo.com/gemini-original-2026-10-18-living-room.jpg
				70 link Description: Detailed interior — Composited input Composited input ↓, Value: watermarkundo.com/composited-input-2026-10-18-living-room.png
				71 link Description: Detailed interior — Tool output Tool output ↓, Value: watermarkundo.com/cleaned-2026-10-18-living-room.png
				72 text Max 1/255 · MAE 0.00 (rounded) · different pixels in/out 710/0
				73 text Box (1296, 688), 48 × 48 · box MAE 0.18 · input changed 883 pixels. Gemini original → same-map input → live output; errors vs original.
			74 container
				75 heading Portrait conservatory 896 × 1200 · Auto 48 px · 2026-10-18, Value: 3
					76 text Portrait conservatory 896 × 1200 · Auto 48 px · 2026-10-18
				77 link Description: Portrait conservatory — Original Original ↓, Value: watermarkundo.com/gemini-original-2026-10-18-conservatory.jpg
				78 link Description: Portrait conservatory — Composited input Composited input ↓, Value: watermarkundo.com/composited-input-2026-10-18-conservatory.png
				79 link Description: Portrait conservatory — Tool output Tool output ↓, Value: watermarkundo.com/cleaned-2026-10-18-conservatory.png
				80 text Max 1/255 · MAE 0.00 (rounded) · different pixels in/out 678/0
				81 text Box (816, 1120), 48 × 48 · box MAE 0.16 · input changed 883 pixels. Gemini original → same-map input → live output; errors vs original.
			82 container
				83 heading Coast 1200 × 896 · Manual 96 px (not Auto96) · 2026-10-18, Value: 3
					84 text Coast 1200 × 896 · Manual 96 px (not Auto96) · 2026-10-18
				85 link Description: Coast — Original Original ↓, Value: watermarkundo.com/gemini-original-2026-10-18-coast.jpg
				86 link Description: Coast — Composited input Composited input ↓, Value: watermarkundo.com/composited-input-2026-10-18-coast.png
				87 link Description: Coast — Tool output Tool output ↓, Value: watermarkundo.com/cleaned-2026-10-18-coast.png
				88 text Max 1/255 · MAE 0.00 (rounded) · different pixels in/out 2679/0
				89 text Box (1040, 736), 96 × 96 · box MAE 0.16 · input changed 4634 pixels. Gemini original → same-map input → live output; errors vs original.
			90 button (collapsed) Measurements, original files and reproducible method, Secondary Actions: Expand
				91 text Measurements, original files and reproducible method
		92 text No upload  — files stay in your browser No sign-up No watermark  added to your download
		93 container inspect-download
			94 heading Inspect the downloaded result, Value: 2
				95 text Inspect the downloaded result
			96 text Keep the original beside the downloaded PNG so you can judge the marked area without losing sight of the surrounding picture.
			97 text As a practical review, inspect whether the sparkle remains visible, whether its former location looks acceptable, and whether the surrounding picture still matches the original. These are suggested acceptance checks, rather than a built-in quality test.
			98 text On WatermarkUndo, a cleaned download means a PNG with the visible Gemini sparkle addressed; it does not mean SynthID has been removed.
			99 text SynthID and other invisible or steganographic watermarks are outside this tool’s scope.
		100 container saved-image-check
			101 heading Check the saved image, Value: 2
				102 text Check the saved image
			103 image Check image dimensions, corner detail and an unedited control crop
		104 text Read the 
		105 link Description: gemini watermark remover, Value: watermarkundo.com/#how-to-use
		106 text  guide for image size, placement, and removal strength instructions.
		107 container Advertisement · GearUP affiliate link, ID: gearup-ad
			108 text Advertisement · GearUP affiliate link
			109 link jdoqocy.com/click-101905880-17328438
			110 text I may earn a commission if you purchase through this link.
		111 heading How this works, Value: 3
			112 text How this works
		113 container
			114 text Gemini composites its sparkle logo over the image as a semi-transparent white layer. This page reverses that blend exactly: for every pixel under the logo it solves  original = (watermarked − alpha × 255) / (1 − alpha)  using the watermark's alpha map, and leaves every pixel outside the box untouched. The rest of the image is copied through unchanged — dimensions, and for PNG output, pixel values.
		115 container
			116 text All processing happens in your browser.  No file is uploaded to any server, no account is required, and there is no per-day limit because there is no backend doing the work.
		117 content list
			118 container
				119 AXListMarker • 
				120 text Output is always PNG, so the cleaned image is written without a second round of lossy compression.
			121 container
				122 AXListMarker • 
				123 text It targets the  visible  Gemini sparkle watermark at Gemini's standard placements. If a watermark sits somewhere else, use the nudge sliders.
			124 container
				125 AXListMarker • 
				126 text It does not touch invisible/steganographic watermarks such as SynthID.
			127 container
				128 AXListMarker • 
				129 text This version handles images. Video is not supported yet.
		130 container
			131 text Alpha-map data derived from the MIT-licensed 
			132 link Description: GargantuaX/gemini-watermark-remover, Value: github.com/GargantuaX/gemini-watermark-remover
			133 text  project. See NOTICE.txt.
		134 text Affiliate disclosure: This site may include affiliate links. I may earn a commission if you purchase through them.
		135 container Latest, ID: latest
			136 heading Latest, Value: 2, ID: latest-title
				137 text Latest
			138 content list
				139 container
					140 text 2026-10-21
					141 heading Does a Gemini Watermark Remover Preserve PNG Transparency?, Value: 3
						142 link Description: Does a Gemini Watermark Remover Preserve PNG Transparency?, Value: watermarkundo.com/gemini-watermark-remover-transparent-png
				143 container
					144 text 2026-10-20
					145 heading Why can a resized Gemini screenshot leave a watermark outline?, Value: 3
						146 link Description: Why can a resized Gemini screenshot leave a watermark outline?, Value: watermarkundo.com/gemini-watermark-remover-resized-screenshot
				147 container
					148 text 2026-10-19
					149 heading Why does a Gemini watermark leave a ghost after JPEG compression?, Value: 3
						150 link Description: Why does a Gemini watermark leave a ghost after JPEG compression?, Value: watermarkundo.com/gemini-watermark-remover-jpeg-ghosting
					151 text A faint ghost after JPEG compression? Our dated synthetic test separates encoding loss from corner cleanup. Read the JPEG ghosting experiment and download the measurements.
				152 container
					153 text 2026-10-18
					154 heading Why is the PNG bigger after removing a Gemini watermark?, Value: 3
						155 link Description: Why is the PNG bigger after removing a Gemini watermark?, Value: watermarkundo.com/gemini-watermark-remover-png-file-size
					156 text For the synthetic file-size measurements and downloadable records, read why a cleaned PNG can be bigger. For measured file-size examples, read why a cleaned PNG can be bigger.
		157 link Description: About, Value: watermarkundo.com/about.html
		158 link Description: Privacy, Value: watermarkundo.com/privacy.html
		159 link Description: Contact, Value: watermarkundo.com/contact.html
		160 link Description: gemini watermark remover, Value: watermarkundo.com/#how-to-use

The focused UI element is 161 button Description: Choose a Gemini image, ID: dropzone