Image Watermark Tool

This is a free, browser-based utility designed to protect your digital assets. It allows you to add custom text or logo overlays as visible watermarks for branding, or apply invisible blind watermarks for stealth security. All processing happens locally in your browser, ensuring your photos are never uploaded to a server, making it a safe and efficient choice for photographers and designers.

Unlike traditional watermarks that cover the image, a blind watermark uses digital steganography to hide copyright information directly inside the image pixels. It remains invisible to the naked eye, preserving the original look of your artwork while providing a hidden layer of proof. If someone steals your image, you can use the Decode feature of this tool to reveal the hidden copyright signature.

It depends on your goal. Use Visible Watermarks (Text/Image) for marketing and preventing casual reuse, ideal for social media posts where you want your brand seen. Use Blind Watermarks for high-value photography, design drafts, or confidential documents where you need to track ownership without altering the visual aesthetics. You can even combine both for maximum security.

Blind watermarking relies on modifying specific pixel data (LSB). JPG format uses lossy compression, which tends to discard these subtle pixel differences to save file size, destroying the hidden watermark. PNG uses lossless compression, preserving every pixel exactly as it is, which ensures the hidden encrypted pattern remains intact and readable during decoding.

If you suspect an image contains a blind watermark created by this tool, switch to the Decode tab. Upload the original PNG image, and the tool will analyze the pixel data to reveal the hidden pattern or text on the canvas. Note that if the image has been heavily compressed or resized by third-party platforms, the hidden watermark might be damaged.