Add a text or logo watermark to any JPG, PNG, or WebP image, right in your browser. Control font size, color, opacity, and position — including a repeating tile pattern — using the Canvas API.
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Watermarking composites a visible mark — text, a logo, or both — onto an image, typically at a controlled opacity so it doesn't fully obscure the underlying content. The practice predates digital images entirely, tracing back to translucent marks pressed into paper during manufacturing to indicate a paper mill's origin, and the same core idea carries directly into digital images: a visible, semi-transparent overlay that signals ownership or origin without requiring a viewer to look anywhere else for that information. Digital watermarking specifically for images is most commonly used to protect preview-quality copies shared publicly (on a portfolio site, social media, or a stock photo listing) while still letting people see enough of the image to evaluate it.
This tool decodes your base image onto an HTML canvas at its full original resolution, then draws your watermark on top using the Canvas API's own text-rendering (for text watermarks) or image-drawing (for logo watermarks) functions, with the canvas's global alpha property controlling opacity for whichever layer is being drawn. Position is calculated from your chosen corner, center, or tile setting using straightforward coordinate math relative to the canvas's width and height, with a fixed edge padding so corner watermarks never sit flush against the very edge of the image. For the Tile position specifically, the canvas context is rotated by 30° before a grid of repeated watermark copies is drawn across an area larger than the visible canvas, guaranteeing full coverage with no gaps in any corner once the rotation is applied — all of this happens through standard, well-supported Canvas API operations with no server round-trip or third-party service involved.
Text watermarks are the simplest to set up — no second file needed — and work well for straightforward copyright notices, names, URLs, or short labels like 'DRAFT' or 'SAMPLE'. They're also infinitely flexible in content without needing any image editing skill, since changing the text is just typing. Logo watermarks require an extra upload but produce a more polished, brand-consistent result, especially for businesses and photographers whose visual mark is more instantly recognizable than their name in plain text would be. A transparent PNG logo tends to look most professional as a watermark, since it blends into the underlying image without an obvious background rectangle. Many real-world use cases combine both across different assets — a text watermark for quick internal drafts, a logo watermark for public-facing portfolio previews.
A single corner placement (commonly bottom-right, which is the default in this tool) is the most common choice for portfolio and social media images — it's unobtrusive, doesn't interfere with the main subject, and is still clearly visible as an attribution mark without dominating the composition. Center placement makes a much stronger, more attention-grabbing statement and is common for draft or confidential document marking, where you specifically want the mark impossible to overlook or crop away without destroying the image's usefulness. Tile placement offers the strongest protection against unauthorized reuse, since it can't be cropped out without cutting away most of the image, making it the standard choice for stock photography previews and situations where deterring outright image theft matters more than aesthetics.
Opacity works alongside position to balance visibility against protection: a low-opacity single-corner watermark is the least intrusive option and suits situations where light brand attribution is the only goal, while a higher-opacity tiled watermark is the most protective option and suits situations where you're sharing a preview specifically to prevent someone from using it as a finished, unmarked image. There's no universally 'correct' combination — match your position and opacity choice to how much you're prioritizing protection versus a clean, unobtrusive viewing experience for the image itself.
Watermark Image handles adding a text or logo mark onto an image. These related image tools cover other common steps in preparing an image for sharing.