A prepared logo can preserve typography and brand shape better than drawing a text label inside an image tool. The important choices are how large it appears and where it sits on the base photograph.
Logo Watermark takes two uploads: the base image first, then the logo in its separate field. It overlays the second image rather than merging both as equal collage cells.
The width percentage uses the base
For a 400 pixel wide base and a 20% setting, the intended logo width is 80 pixels. Its own aspect ratio determines the height. The tool also limits logo height relative to the base so an unusually tall logo does not dominate it.
A transparent PNG logo lets the base show through around the mark. A logo saved on an opaque white rectangle brings that rectangle into the composition; opacity alone does not remove it cleanly.
The selected placement positions the logo inside the base with a margin. Centre placement can cover the subject, while corner placement can be less intrusive.
Inspect the composited edges
Logo opacity scales its existing alpha. An already translucent edge becomes less visible again when opacity is reduced.
Look at both a light and a dark part of the base. A logo can have readable lettering in one area and disappear in another, even when its outline seems clear in the source preview.
The output remains the base image's dimensions. The operation does not resize the whole photograph to the logo's canvas or create separate layers for later editing.
Use the original logo and base for another attempt rather than repeatedly overlaying marks on a previous download. A visible watermark helps identify a source, but it is not an automatic copyright verification or a guarantee against copying.