Image Watermark Tool
Add text or image watermarks to photos.
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Everything you need to know about using Image Watermark Tool effectively.
What is Image Watermark Tool and Why Use It?
Adding a visible mark to an image before it is shared is a way of keeping your name attached to it. Your text is drawn over the picture on a canvas at the position, size, colour and opacity you set, and the combined result is exported as a new file, leaving the original untouched on your device. Photographers sharing proofs, designers circulating drafts and anyone posting work publicly are the usual users. Placement is a real decision rather than a detail: a small mark in a corner is trivially cropped away, while a semi-transparent mark running across a busy part of the image is much harder to remove cleanly. Be clear about what this achieves — the watermark is baked into the exported pixels and cannot be undone in that copy, and while it deters casual reuse, it is not copyright protection and does not prevent determined removal.
Step-by-Step Instructions
- 1
Upload the base image you want to protect with a watermark.
- 2
Enter custom watermark text or upload a transparent PNG logo.
- 3
Adjust opacity, font size, position, and download your watermarked image.
Formula / Calculations Explained
Composite Canvas Alpha Blending
Blends custom text typography or overlay graphics onto the source canvas image at specified opacity and rotation angles before exporting.
Important Considerations
- The watermark is baked into the exported pixels — your original file is untouched, but the export cannot be un-watermarked.
- A semi-transparent mark across a busy area of the image is harder to crop or paint out than a small one in a corner.
- A visible watermark deters casual reuse. It is not copyright protection.
Frequently Asked Questions
Can I adjust watermark transparency so it doesn't obscure the photo?▼
Yes, an intuitive opacity slider allows you to blend subtle, professional watermarks that protect copyright without ruining aesthetics.
Can I tile watermarks across the entire image?▼
Yes, you can choose single placement (corners, center) or a repeating tiled pattern across the canvas.
Are my high-resolution photos sent to your server?▼
No, all composition and watermarking occur locally in your browser with zero uploads.
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