Image Watermark

The Image Watermark tool lets you place either a line of text or a logo image on top of a picture you upload, shows a live preview, and then downloads the result as a PNG. It is handy for adding a credit, a site name or a "for reference only" label to images you share. One thing to be clear about up front: a watermark is just a visible mark drawn onto the pixels. It is not encryption, and it cannot stop someone from cropping it out, covering it or retouching it away.

How to use it

1. Click "Click to upload an image" and choose the picture you want to mark. Once it loads, the settings and a preview canvas appear.
2. Under "Watermark type", choose "Text watermark" or "Image watermark (logo)".
3. For text, type your wording in "Watermark text" (the default is Sample Watermark), then adjust "Font size" (12 to 80 px) and "Color".
4. For a logo, click "Click to choose a logo" and pick a file, preferably a transparent-background PNG. The "Logo size" slider sets the logo's width as a share of the image width, from 5% to 40%.
5. For both types you can change "Opacity" (10% to 100%) and "Position": top left, top right, center, bottom left, bottom right or tiled. The preview updates immediately.
6. When it looks right, click "Download watermarked image" to save a file named watermarked.png.

A practical scenario

Imagine you are posting a product photo online and do not want it reused freely. Upload the photo, choose a text watermark, type your shop name, set the position to "Tiled" and the opacity somewhere around 30% to 40%. In tiled mode the text repeats across the whole image at a 25-degree tilt, which is harder to crop away than a single corner mark. For a quieter credit line, use "Bottom right" with a smaller font size and a higher opacity instead. Pick the colour with the background in mind: white suits dark images, while a light image needs a dark colour, because the text has no outline or shadow and can disappear when it is close to the background colour.

Supported range and known limits

• One image at a time. The watermark is either a single piece of text or a single logo; you cannot combine both, and multi-line text is not supported.
• Text is drawn in bold using the system's default sans-serif font. You cannot choose a font, and Chinese or other scripts only display properly if your device has a suitable font. There is no outline or shadow.
• Font size is a fixed pixel value, independent of the picture. On a very large image (several thousand pixels wide) the same size looks tiny, so raise the size or use a logo, which scales with the image width.
• Output is always PNG at the original pixel dimensions. Even if you start with a JPEG, you get a PNG, which may be larger. Run it through the Image Format Converter if you need JPEG or WEBP.
• If you choose "Image watermark (logo)" but have not picked a logo yet, the preview is just the original image, the page tells you to upload a logo first, and the download button is disabled.
• Logo height follows the logo's own aspect ratio. In tiled mode the spacing between marks is fixed by the tool and cannot be adjusted separately.
• Original metadata such as EXIF is not kept; the output is a freshly drawn PNG.

FAQ: Will a watermark stop people from stealing my image?

It discourages reuse and raises the effort needed, but it cannot prevent it. The watermark is painted into the pixels, so someone can crop, paint over or retouch it. A tiled watermark across the subject is harder to remove but also affects how the picture looks, so you have to balance protection against appearance. For important material, consider publishing only reduced-size versions and keeping the originals to yourself.

FAQ: Why can't I see my watermark?

There are three usual reasons. The colour may be too close to the background, for example the default white text on a pale image, so try another colour. The opacity may be too low, so drag the "Opacity" slider to the right. Or you may have selected the logo type without uploading a logo, in which case the preview is just the original picture (the page shows a notice).

FAQ: Why is the download a PNG, and why is it bigger than my original?

The finished canvas is exported as PNG, which is lossless and keeps more information than JPEG, so photographs often become noticeably larger. If you need a smaller file, take the downloaded PNG to the Image Format Converter and turn it into JPEG or WEBP with a quality setting.

FAQ: What kind of logo file works best?

A PNG with a transparent background. If your logo has a solid white or coloured box behind it, that whole box is drawn onto the picture and looks like a pasted rectangle. The tool applies the opacity you set to the logo as a whole, so you do not need to make the logo semi-transparent beforehand.

FAQ: Does it work on a phone?

Yes. The page relies on standard file selection and canvas features, so you can choose a picture, adjust the settings and download the result in a mobile browser. Large photos use a fair amount of memory on a phone; if the browser struggles, shrink the picture first.

Privacy and how files are processed

Everything happens in your browser. The picture and the logo are read through the browser's file API, composed on a local canvas, and exported straight from that canvas as a PNG when you download. Your images are not uploaded to a server and no account is needed. When you refresh or close the page, the chosen images and settings are cleared.