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Supports JPG, PNG, WebP, GIF, BMP, SVG — batch upload multiple images
The Online Image Watermark Tool is a pure frontend application — all image processing happens locally in your browser, with no uploads to any server. You can easily add text or image watermarks to protect your creative work.
Click the upload area or drag and drop images onto the page. Batch upload of multiple images is supported. Supported formats include JPG, PNG, WebP, GIF, BMP, and SVG.
The tool supports two watermark types:
Use the settings panel on the left to adjust watermark parameters:
Click the "Apply Watermark" button to preview the effect. When satisfied, you can download a single image or batch download all processed images. PNG, JPEG, and WebP output formats are supported.
The Image Watermark Tool is useful in the following scenarios:
Digital Watermarking is divided into visible and invisible watermarks. This tool uses visible watermarks — overlaying visible text or graphics onto the image. Invisible watermarks (steganography) embed hidden information by modifying pixel data, which cannot be detected by the human eye.
Watermark Best Practices: Watermarks should have moderate transparency (typically 30%-60%), providing protection without significantly affecting image viewing. Common positions include bottom-right, bottom-left, or image edges, avoiding main visual focal points.
Canvas API is the core technology behind this tool. It's an HTML5 drawing interface that enables direct image processing in the browser. Through the CanvasRenderingContext2D object, we can perform image drawing, text rendering, opacity adjustment, rotation, and more.
Yes, completely free. This tool is a pure frontend application — all processing happens locally in your browser, with no images uploaded to any server.
Supports JPG/JPEG, PNG, WebP, GIF, BMP, and SVG formats. Output format can be set to PNG or JPEG.
Yes, absolutely safe. All image processing happens locally in your browser. Your images and watermark files are never uploaded to any server, ensuring complete privacy protection.
Yes. You can upload multiple images at once, apply the same watermark settings to all of them, and download all processed images in one go.
Text watermarks support customization of content, font family, font size, color, transparency, rotation angle, position (9 preset positions), and tiled mode.
Tiled Mode repeats the watermark across the entire image with regular spacing, ideal for scenarios requiring full coverage.
Download quality depends on the output format you choose. PNG supports lossless output. JPEG allows you to control file size and clarity via the quality parameter. We recommend a quality setting of 80%-90% for best results.
The current version extracts the first frame of animated GIFs and processes it as a static image. If you need to add watermarks to animated GIFs while preserving animation, please use a dedicated GIF editing tool.
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