ウォーターマーク作成

Add an image watermark before you publish

Watermark Maker takes two images: the base image you want to protect or brand, and a separate watermark image. In practice, that watermark is usually a transparent PNG logo, badge, signature, or small brand mark. Once both files are loaded, the preview updates as you change position, opacity, size, padding, and blend mode.

The tool is best for quick one-off images: a product shot, a portfolio preview, a social post, or a draft you want to send without sharing a clean original. It exports a PNG result from the browser canvas.

A simple way to set it up

1. Drop or choose your base image.
2. Add the watermark image. A transparent PNG usually gives the cleanest result.
3. Pick a position from the 3-by-3 grid, or use Random if you want a less predictable placement.
4. Adjust opacity and size until the watermark is visible but not fighting the image.
5. Try Multiply, Screen, or Overlay only if Normal looks too flat on the background.
6. Download the generated PNG when the preview looks right.

What to watch for

Very small logos can look soft if you scale them up too far, so it is better to start with a watermark image that is larger than you think you need. If the watermark disappears on a bright or dark photo, change the blend mode or raise the opacity a little instead of making it huge.

Processing happens with browser image APIs and canvas. There is no account step and no server-side render queue; you choose the files, adjust the preview, and download the result from the page.