# 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. > Canonical page: https://elysiatools.com/en/tools/adaptive-12-point-hidden-watermark - **Category:** Media - **Keywords:** hidden watermark, subtle watermark, copyright image, 12 point watermark, adaptive contrast ## Overview 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](https://elysiatools.com/tools/adaptive-12-point-watermark-cover-restorer). ## Inputs - **Image file** (file): Upload one JPEG, PNG, WebP, AVIF, or TIFF image - **ZIP archive** (file): Upload a ZIP containing up to 20 supported images - **Watermark text** (textarea): Buyer: demo-user example.com/creator - **Placement mode** (select) - **Random position count** (number) - **Random seed (optional)** (text): leave blank for a stable derived seed - **Custom position selection** (select) - **Opacity** (number) - **Font size (% of short edge)** (number) - **Edge inset (% of short edge)** (number) - **Output format** (select) ## When to use - You want to embed visible yet unobtrusive ownership or buyer information along the edges of an image. - Your images contain mixed dark and light borders where fixed-color watermarks are either unreadable or overly harsh. - You need repeatable perimeter stamping using pseudo-random seeds or explicit point selections across batches. ## How it works - Upload a JPEG, PNG, WebP, AVIF, or TIFF image up to 100 MB. - Enter your watermark text and choose whether to apply marks to all 12 positions, a random subset, or specific chosen perimeter points. - Adjust the opacity, font size percentage, and edge inset to tune visibility against your layout. - Select your target export format (JPEG, PNG, WebP, or preserve original format) and generate the marked image. ## Use cases - Digital artists stamping low-distraction copyright and handle credits onto edge areas of preview illustrations. - Stock photo platforms embedding recipient identifiers into proof deliveries without blocking center compositions. - Photographers tagging high-resolution gallery exports with consistent, multi-point subtle verification markers. ## Frequently asked questions ### 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. ## Related tools - [Batch Image Watermark](https://elysiatools.com/en/tools/batch-watermark): Add watermarks to multiple images with text or image watermarks, position control, and batch processing - [Batch Image Convert](https://elysiatools.com/en/tools/batch-convert): Convert multiple images to different formats with quality settings and batch processing - [Batch Image Resize](https://elysiatools.com/en/tools/batch-resize): Resize multiple images to specific dimensions with various resize options and batch processing - [Batch Image Crop](https://elysiatools.com/en/tools/image-batch-crop): Batch crop multiple images to specific dimensions or aspect ratios with custom positioning. 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