How many images can I watermark at once?

There's no hard limit, but your browser's memory determines how many large images you can process. Most users handle 50-100 images without issues. For very large batches, process in groups.

Are my images uploaded to a server?

No. All processing happens locally in your browser using the Canvas API. Your files never leave your device.

Can I use a logo with a transparent background?

Yes. Upload a PNG with a transparent background in image mode. The transparency will be preserved when the logo is placed on each image.

What image formats are supported for input?

The tool accepts JPEG, PNG, WebP, and any other format your browser can display, which covers the vast majority of common image types.

Can I watermark photos in different sizes?

Yes. The watermark size scales proportionally with each image, so the watermark will look consistent across images of different dimensions.

Images Tool Box

Utilities

Batch Watermark Images Online Free

Protect and brand dozens of images at once. Add a text or logo watermark with full control over position, opacity, rotation, and tiling. All processing happens in your browser and results download as a single ZIP file.