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I have a set of polygon layers with thousands of polygons some of which are adjacent (Either rings or simply adjacent). I would like to simplify this polygons by merging them.

Is there a way to do this automatically?

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    Tried Processing Toolbox "Dissolve" followed by "Multipart to Singlepart" (if applies) Tools?
    – Jochen Schwarze
    Commented Jun 8, 2017 at 16:04

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You could ask the dissolve tool which you can select through the Vector tab, then Geoprocessing tools.

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Then select the dissolve tool to open and input the dataset

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You could also refer to QGIS documentation

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    Solution to my problem was "Dissolve" > "Dissolve all" followed by Multipart to Singlepart. The first step can take very long sometimes though. In the case of about 10000 polygons it can be about 4-5 hours. Maybe there is a faster solution?
    – C.-F. Vintar
    Commented Jun 9, 2017 at 15:40

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