GROWMARK

Documentation

Help Center

Everything you need to know about using Growmark.

Quick Start Guide

1

Open the tool

Go to the Growmark home page. No sign-up or account required.

2

Upload your image(s)

Click the upload area or drag-and-drop. Supports JPG, PNG, WebP up to 20 MB. You can upload multiple files for batch processing.

3

Wait for processing

Growmark auto-detects the watermark size and position. Processing typically takes under 1 second per image.

4

Download result

Click "Download Clean PNG" for single images, or "Download All as ZIP" for batch results.

Frequently Asked Questions

What types of images does Growmark work with?
Growmark is specifically designed for images generated by Google Gemini AI. These images contain a semi-transparent white watermark in the bottom-right corner. The tool automatically detects whether a 48×48 or 96×96 watermark is present based on image dimensions.
Is my data private? Are my images uploaded anywhere?
Absolutely not. Growmark runs 100% inside your browser using JavaScript and the Canvas API. No image data is ever transmitted to any server. Your files stay entirely on your device.
Why does it say "not a Gemini image"?
Growmark reads EXIF metadata to check for a Gemini-specific credit tag. If the image has been converted, screenshot-cropped, or stripped of metadata, this check may fail. You can still process the image — the check is advisory only.
How many images can I process at once?
There is no hard limit. Growmark processes up to 3 images concurrently in batch mode. For very large batches (50+ images), processing time depends on your device's hardware. Each image must be under 20 MB.
What format are results saved in?
All results are exported as lossless PNG files, regardless of input format. This ensures maximum quality. Batch downloads are packaged as a single ZIP archive.

Troubleshooting

Engine won't initialise: Try refreshing the page. Growmark requires a modern browser (Chrome 80+, Firefox 80+, Safari 13+).

Watermark still visible after processing: This may indicate the image was not the original Gemini output (e.g. compressed or re-encoded). Try processing the highest-quality version of the file.

File rejected: Ensure the file is a valid JPG, PNG, or WebP under 20 MB.

Download doesn't start: Some browsers block automatic downloads. Check your browser's download bar or settings.

Still having issues? Contact our support team →