Is this watermark completely invisible or steganographic?

No. It is a low-contrast visible text overlay that dynamically balances text color against the underlying background pixels.

What are the 12 perimeter positions?

The positions span across the outer edges: top, upper, middle, lower, and bottom zones on both left and right sides, plus top-center and bottom-center.

How does the adaptive contrast feature work?

The tool analyzes the average brightness behind each mark, applying dark text on bright areas and light text on dark areas.

Can I reproduce the exact same mark layout across multiple images?

Yes. Set the placement mode to 'Random subset' and specify a custom random seed string, or select exact positions under 'Custom positions'.

Which image formats can I upload and download?

You can upload JPEG, PNG, WebP, AVIF, and TIFF files. Outputs can preserve the input format or convert directly to JPEG, PNG, or WebP.

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Adaptive 12-Point Hidden Watermark

Add a subtle text watermark to one image or every supported image in a ZIP, at all, random, or chosen perimeter positions with automatic dark/light local contrast.

Details

What this tool helps you do

This is a Fansky-style visible but low-contrast perimeter copyright overlay, similar to the supplied reference image; it has no affiliation with Fansky. It is not a steganographic or tamper-proof watermark. The image is sampled behind each mark so bright areas receive dark text and dark areas receive light text. To partially cover matching marks later, use Adaptive 12-Point Watermark Cover Restorer.

Execution

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2 examples

Protect an image at all 12 perimeter points

Place a subtle two-line buyer and source mark around a bright image; each point automatically switches to a dark foreground.

A 12-point adaptive low-contrast watermark image

Watermark every image in a ZIP

Add a selected lower-center mark to each supported image in a ZIP and receive a ZIP with the watermarked images plus a JSON report.

A ZIP of watermarked images and watermark-report.json

Inputs

Options are grouped so long tools stay easier to scan.

11 options

FilesUpload source files for this workflow.2

Image filefileOptional

Single file max size: 100 MBSupported types: image/jpeg, image/png, image/webp, image/avif, image/tiff, .jpg, .jpeg, .png, .webp, .avif, .tif, .tiff

ZIP archivefileOptional

Single file max size: 100 MBSupported types: application/zip, application/x-zip-compressed, .zip

ContentPaste or type the main input values.2

Watermark texttextareaRequiredRandom seed (optional)textOptional

SettingsAdjust formats, ranges, numbers, and modes.7

Placement modeselectRequiredRandom position countnumberRequiredCustom position selectionselectOptionalOpacitynumberRequiredFont size (% of short edge)numberRequiredEdge inset (% of short edge)numberRequiredOutput formatselectRequired

Result

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Samples

Adaptive 12-Point Hidden Watermark

What this tool helps you do

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Key facts

Overview

When to use

How it works

Use cases

Examples

1. Full Perimeter Proof Stamping

2. Repeatable Buyer Tracking with Seeded Positions

FAQ

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