Add a Watermark to Any Image Online — Free
ImgToolkit's watermark tool lets you add a custom text watermark to any image in seconds. Choose your text, adjust the font size, set the opacity, and drag the watermark to exactly where you want it. Everything runs in your browser — your photos are never sent to any server. Unlimited use, completely free, no watermark added by the tool itself.
Quick Answer
ImgToolkit's watermark tool lets you add a custom text watermark to any image in seconds. Choose your text, adjust the font size, set the opacity, and drag the watermark to exactly where you want it.
Try it now — free, no signup
Your images stay on your device. Nothing is uploaded to any server.
Step-by-Step Guide
5 steps · takes under 1 minute
Upload your image
Drop in your JPG or PNG. The image loads instantly in your browser.
Enter your watermark text
Type your name, website, @handle, or copyright notice. Adjust the font size to suit the image dimensions.
Set color and opacity
White text works on most photos. Set opacity to 30–50% for a professional, subtle result.
Drag to position
Click and drag the watermark preview to your preferred position.
Download
Download the watermarked image. Original quality is preserved.
100% Private — Zero Uploads
ImgToolkit runs entirely in your browser using the Canvas API. Your images are never sent to a server, never stored in the cloud, and never seen by anyone else. This makes it safe for sensitive documents, client work, medical imagery, and confidential screenshots.
Pro tip
All processing happens in your browser using WebAssembly and the Canvas API. No files are sent to any server — your images stay completely private.
Format & File Size Comparison
Same 1080×1080px photo processed four ways
| Format | Quality | File Size | Notes |
|---|---|---|---|
| PNG (original) | Perfect | 4.2 MB | No compression — too large for web |
| Compressed PNG | Visually identical | 1.1 MB | −74% — transparency preserved |
| JPG (85% quality) | Excellent | 310 KB | −93% · Best for photos |
| WebP (85%)BEST | Excellent | 205 KB | −95% · Recommended for web |
Based on a 1080×1080px photo. Results vary by image content and complexity.
Related Free Tools
All tools run in your browser — no account or upload needed
Frequently Asked Questions
3 questions answered