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I want to convert polygons into points using QGIS.

I know how it's done in ArcGIS Desktop.

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Do you mean convert the polygon borders into points or just reduce it to a point (get centroids)? – R.K. Apr 30 '12 at 14:35
up vote 22 down vote accepted

You can do polygon to centroid in QGIS using:

Vector - Geometry Tools - Polygon Centroids

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thanks! It did! – Lukas Apr 30 '12 at 15:04
    
Aragon, i didn't make it! i have 2 polygon and after using the tool i got only 2 point in the center of the polygon. i want point in the perimeter of the polygons.how do i do it with qgis? – newGIS Jan 14 '15 at 8:37
    
Check gene answer below. – Alexandre Neto Jan 14 '15 at 14:54

You can do polygon to border nodes in QGIS using:

Vector - Geometry Tools - Nodes extraction
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If you want to decide on your own point spacing, you can use the Sextante Toolbox with SAGA functionality activated (you'll need to install saga - www.saga-gis.org/ - and specify the installation path in sextante). Use the 'polygons to line' geoalgoritm followed by the 'line to points' one. You can create a model in sextante that combines these into one step as well.

Note: you have to make sure you install the right version of SAGA - I think its 2.0.8

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