Overlay Images Online & Add Watermarks
Put one image, logo, sticker, or watermark on top of another photo. Control opacity, position, scale, and blend modes in real-time. 100% private in-browser.
1. Base Background Image
Click or drop bottom main photo
2. Top Overlay Image / Logo
Click or drop overlay logo/sticker
Frequently Asked Questions
How do I put one image on top of another online?
Upload your main base picture into the 1st box, upload your top overlay picture or logo into the 2nd box, pick your preferred position and size, and click 'Download Overlaid Image'. It merges instantly with 0 quality loss.
Can I add a transparent PNG logo as a watermark?
Yes! WebToolkitBox supports transparent PNG logos and allows you to adjust opacity (e.g. 50% transparency) to create subtle, professional watermarks on your pictures.
Are my images uploaded to external servers?
No! All image compositing and overlay merging is processed locally inside your web browser using HTML5 Canvas. Your photos remain 100% private.