Secure Image Watermarking Tool - Add watermarks to sensitive documents with complete privacy
Safely watermark your ID cards, passports, and licenses. 100% local processing - your images never leave your device. No uploads, no servers, maximum privacy.
Choose image from your device
PNG, JPG, GIF - processed locally
Select an image to preview
Your watermarked image will appear here
Click on the watermarked image to download it
Absolutely! MarkImg processes all images entirely within your browser using JavaScript and HTML5 Canvas. Your images never leave your device, are never uploaded to any server, and no network requests are made during processing. This ensures complete privacy for sensitive documents like ID cards, passports, and licenses.
MarkImg supports the most common image formats: PNG, JPEG (JPG), and GIF. These formats are widely used for documents and photographs, ensuring compatibility with most images you need to watermark.
MarkImg adds repeating watermark text across your entire image at customizable angles, transparency levels, and spacing. This makes it extremely difficult to remove the watermark while keeping your document readable. The watermark serves as proof that the document is for verification purposes only.
Yes! You can fully customize your watermark with options for text content, color, transparency (alpha), rotation angle, spacing between repetitions, and font size. The real-time preview lets you see changes instantly as you adjust settings.
MarkImg supports two output formats: PNG (lossless quality, larger file size) and JPG (compressed, smaller file size). PNG is recommended for documents that require maximum quality, while JPG is ideal when you need smaller file sizes for easier sharing via email or messaging apps.
MarkImg is perfect for protecting sensitive identity documents including ID cards, driver's licenses, passports, social security cards, bank statements, tax documents, and any other sensitive paperwork that you need to share for verification purposes while preventing misuse.
No installation required! MarkImg is a web-based tool that runs entirely in your browser. It works on any modern browser including Chrome, Firefox, Safari, and Edge on both desktop and mobile devices. Simply open the website and start watermarking immediately.
Once you've applied your watermark settings and selected your preferred output format, simply click on the preview image in the right panel. This will automatically download the watermarked image to your device with a timestamp filename for easy organization.