Base map with no labels in QGIS

Indeed it is a challenge to find free basemaps without labels.

I can provide this list of no-label basemaps:

• Carto Dark No Labels: https://a.basemaps.cartocdn.com/dark_nolabels/{z}/{x}/{y}@2x.png
• Carto Light No Labels: https://a.basemaps.cartocdn.com/light_nolabels/{z}/{x}/{y}@2x.png
• Carto Voyager No Labels: https://a.basemaps.cartocdn.com/rastertiles/voyager_nolabels/{z}/{x}/{y}@2x.png
• Carto Voyager Only Labels Under: https://a.basemaps.cartocdn.com/rastertiles/voyager_labels_under/{z}/{x}/{y}@2x.png
• OSM No Labels: https://tiles.wmflabs.org/osm-no-labels/{z}/{x}/{y}.png

Dont forget to take a look at their terms of use: here and here.

Create a new XYZ-Connection and add them there. A detailed description can be found at https://geogeek.xyz/how-to-add-google-maps-layers-in-qgis-3.html

The QuickMapServices plugin actually has a few base layers without labels.

• Stamen
  • Toner Background
  • Terrain Background
• CartoDB
  • Dark Matter [no labels]
  • Dark Matter [no labels] (retina)
  • Positron [no labels]
  • Positron [no labels] (retina)

You might need to install the "contributed pack" to get access to the maps listed above. Note that this setting will also enable some maps that don't actually work.

While this is a rather short list, you can actually get quite a wide variety by adjusting the Color Rendering Settings of the base layers listed here. I strongly recommend writing down what settings you use when you make a map, otherwise it will take a very long time to re-create by trial and error.