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I'm having a problem with the mouse wheel zoom setting on my macbook trackpad. The zoom occurs far too quickly for any level of precision. I noted this comment in the dev log:

2004-08-14 [gsherman] 0.4.0devel9 Added mouse wheel zoom. Moving wheel forward zooms in by a factor of 2.

How can I change the settings so that zooming occurs by a factor of 1 or .5?

I'm using QGIS 2.6 Brighton.

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4 Answers 4

Reset to default
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Open Preferences > Options menu and go to "Map Tools" (see the screenshot below). The Zoom factor will be available on the main window.

For QGIS v3.X provide a zoom factor in percentage :

Zoom wheel QGIS3

For QGIS v2.X, just provide a ratio value : Zoom wheel

Notice that the minimal value is 1.1 ... 1 would just do nothing and a value < 1 would unzoom.

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    Thank you for this information. Currently I am using 2.14.3 Essen and a zoom factor of 1.1 is my sweet spot for zooming with a apple trackpad.
    – Gert
    Commented Jul 6, 2016 at 9:09
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    110% for QGIS3, where the values are percentages instead of proportions
    – Javier Fajardo
    Commented Jul 19, 2018 at 23:22
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For QGIS3

setting > option > map Tools > zoom factor

QGIS3

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If you zoom out too far and lose your layers, you can right-click on a layer in the Layers Panel and select Zoom to Layer.

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To use fine-resolution zooming with the mouse wheel scroll up/down, press one key:

  • Windows, Linux: Ctrl+scroll up/down
  • macOS: ⌘+scroll up/down
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