Image Watermarker

Sharing a photo online (a portfolio piece, a product shot, a social media post) often means marking it first, so a copy that gets re-shared or scraped still carries your name, handle, or a "do not use" notice. This tool stamps a customizable text watermark directly onto an uploaded image, entirely in your browser, and lets you download the marked file with no account, no upload limit, and no server involved.

Pick your watermark text, then place it with the same nine-point position picker (top-left through bottom-right, plus dead center) used by this site's PDF watermarking tool, choose a font size, a color, an opacity from barely-there to fully opaque, and a rotation angle for a diagonal stamp across the frame. A live preview overlays the watermark on your actual uploaded image as you adjust each setting, so what you see before downloading is exactly what ends up in the file.

Under the hood, the watermark is drawn straight onto the image's own pixel data with the Canvas API, the same approach a native photo editor would use, then exported as a new file in your original image's format (JPEG, PNG, or WebP) via the browser's built-in image encoding, so there's no quality-losing round trip through an unrelated format. The output keeps your photo's original resolution; nothing is downscaled to make the watermark process faster.

Every step, from decoding the image and rendering the live preview to baking the final watermark into the downloaded file, happens locally using APIs already built into your browser. Your photo is never uploaded, transmitted, logged, or stored anywhere, even for a moment.