How to Add a Watermark to an Image Online Free
A watermark is the fastest way to protect your photos from being used without credit. Whether you're a photographer protecting portfolio shots, a business branding product images, or a creator defending your work on social media, adding a watermark takes less than a minute. ImgToolkit's watermark tool runs entirely in your browser — your photos never leave your device.
Quick Answer
A watermark is the fastest way to protect your photos from being used without credit. Whether you're a photographer protecting portfolio shots, a business branding product images, or a creator defending your work on social media, adding a watermark takes less than a minute.
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
Open the Watermark tool
Navigate to the Watermark Image tool on ImgToolkit. No account or installation needed.
Upload your image
Drop in your JPG or PNG. The original file stays on your device throughout.
Type your watermark text
Enter your name, website URL, copyright notice, or brand name. Choose font size, color, and opacity.
Position the watermark
Drag the watermark to any corner or center position. Reduce opacity to 30–50% for a subtle, professional look.
Download the watermarked image
Click download. Your watermarked photo saves directly to your device.
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
Use 75–85% quality for web images — you get 60–80% smaller files with no visible difference at normal screen sizes.
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
5 questions answered