Image Watermark

How to Use

1. Click the area above to select a file, or drag and drop a file onto the page
2. Adjust parameters in the settings area
3. Click the process button and download the result when ready

Frequently Asked Questions

How It Works

The Image Watermark tool uses the HTML5 Canvas API to overlay text or image elements onto source images with configurable transparency. The Canvas 2D context provides precise positioning and alpha blending capabilities.

Text watermarks are rendered using fillText() with configurable font family, size, color, and opacity. The globalAlpha property controls transparency (0.0 = fully transparent, 1.0 = fully opaque). Position is calculated using the canvas width/height and text metrics: bottom-right = (canvas_width - text_width - margin, canvas_height - margin).

Image watermarks (logos) are loaded as ImageBitmap objects and drawn using drawImage() at the specified position with optional scaling. The tool supports all nine position presets (corners, edges, center) with configurable margins. The watermark is composited onto the original image without re-compressing the base image, preserving original quality where the watermark isn't applied.

Tips & Best Practices

• Subtle opacity at 30-50% makes watermarks protective without being visually intrusive to viewers.
• Corner placement (bottom-right default) is standard practice — it protects the image without covering the main subject.
• High contrast watermark: Use white text with a subtle shadow on dark images, or dark text on light images for visibility.
• Logo watermarks should be small (5-10% of image width) and semi-transparent for professional branding.
• Test different positions: The best watermark position depends on the image content — place it where it's visible but doesn't distract.
• Consistent branding: Use the same font, color, and position across all images for a recognizable, professional brand presence.

Use Cases

Stock photographers adding semi-transparent watermarks to preview images to protect intellectual property before purchase.

Real estate photographers watermarking property listing photos with their business name and contact information. E-commerce sellers adding branded watermarks to product photos to prevent unauthorized use by competitors. Event photographers watermarking preview galleries delivered to clients before final payment. Design agencies adding client watermarks to draft deliverables for review and approval. Social media influencers branding their original content with username watermarks to deter content theft.

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