Image Watermark Tool
Add text or logo watermarks to your images. Customize position, opacity, tiling. Batch process up to 20 files, 100% browser-based.
About This Tool
Image Watermark overlays custom text or a logo image onto your photos to protect your work and assert ownership. Adjust opacity, position, size, rotation, and tiling to create subtle or bold watermarks — essential for photographers, artists, and content creators sharing work online.
Drag & drop images or click to upload
JPG, PNG, WebP · Up to 20 files
How to Use
- Upload images by dragging or clicking the upload area (up to 20 files).
- Select the Text or Image watermark tab.
- Set your watermark text (or logo), size, color, and opacity.
- Choose a position or enable tile repeat.
- Check the preview and click Apply.
- Download individually or as a ZIP.
What Is a Watermark?
A watermark is semi-transparent text or logo overlaid on an image. It serves various purposes including copyright protection, preventing unauthorized use, and brand recognition.
Common use cases
- Product image protection — prevent photo theft on e-commerce sites
- Confidential documents — mark drafts, samples, or confidential files
- Portfolio protection — protect photographers' and designers' work
- Brand promotion — add logos to social media images
Text vs Image Watermark
| Feature | Text | Image (Logo) |
|---|---|---|
| Preparation | None (type directly) | Logo image file |
| Customization | Size, color, rotation, style | Size, opacity |
| Brand impact | Moderate | High (logo recognition) |
| Readability | High | Depends on design |
| Best for | Confidential marks, quick protection | Brand promotion, professional use |
Frequently Asked Questions
Does adding a watermark modify my original image?
No. All processing happens in your browser and your original file remains unchanged. A new watermarked image is created separately.
Can I use a transparent PNG logo as a watermark?
Yes, upload a PNG with a transparent background and the transparency will be preserved, creating a natural-looking watermark.
What is tile repeat?
When tile repeat is enabled, the watermark is repeated across the entire image in a diagonal pattern. This is highly effective for preventing image theft.
Are my photos uploaded to a server?
No. Everything is processed 100% in your browser using the Canvas API. Your photos never leave your device.
Can I watermark multiple images at once?
Yes, you can upload up to 20 images and batch-process them with the same watermark settings. Download individually or as a ZIP.
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How It Works
Your original image and optional watermark image are both loaded into HTML5 Canvas elements. The tool uses the Canvas 2D context's globalAlpha property to control opacity and compositing operations (globalCompositeOperation) for blending. Text watermarks are rendered with fillText(), supporting custom fonts, sizes, and colors. The watermark layer is drawn over the base image at the configured position and angle using translate() and rotate() transforms. For tiled watermarks, the pattern is repeated across the canvas in a grid.
All rendering happens entirely in your browser through the Canvas API. Your images are never uploaded to any external server, keeping your original files completely private and secure.