Can I use a logo with transparency?

Yes — PNG with alpha channel works best; the tool preserves transparency in the watermark.

Does this protect against image theft?

Watermarks deter casual reuse and credit you when content spreads, but a determined attacker can crop or content-aware-fill them out. Treat watermarks as a deterrent, not a guarantee.

Free Online Watermark Tool

Add a logo or text watermark to one or many images.

Protect your photography and brand assets with text or logo watermarks. Position, opacity, and size controls — applied in batch across many images. Runs entirely in your browser.

Open the free Watermark Tool

100% in-browser · nothing leaves your device

How the watermark tool works

Step 1
Drop images
Drag your photos into the browser.
Step 2
Set watermark
Type text or upload a logo PNG, choose position and opacity.
Step 3
Download
Get watermarked images — single file or ZIP.

Why use this tool

Text or logo

Use any text string or a PNG with transparency.

5 positions

Top-left, top-right, bottom-left, bottom-right, center.

Opacity & size

Fine-grained control to keep the watermark visible but unobtrusive.

Batch mode

Apply the same watermark across an entire photoshoot.

Frequently asked questions

Can I use a logo with transparency?: Yes — PNG with alpha channel works best; the tool preserves transparency in the watermark.
Does this protect against image theft?: Watermarks deter casual reuse and credit you when content spreads, but a determined attacker can crop or content-aware-fill them out. Treat watermarks as a deterrent, not a guarantee.

Related free tools

Free Online Image Resizer Free Online Image Cropper Free Online Image Compressor Free Online Image Converter