Fix Invalid Geometry in QGIS

How to Fix Invalid Geometry in QGIS

Updated on:

June 8, 2026

By:

Use this interactive demo to learn how to detect and repair invalid geometry errors in QGIS.

Quick summary

QGIS provides a built-in Check Validity tool in the Processing Toolbox that scans polygon or line layers for geometry errors and outputs separate valid, invalid, and error-report layers. When invalid features are found, you can fix them manually using the Toggle Editing tool directly in QGIS.

Steps

Open the Processing Toolbox from the right-side panel in QGIS.
Use the search bar to find and select the Check Validity tool.
In the dialog box that opens, select your polygon or line layer as the Input Layer.
Choose a validation method — such as QGIS algorithm, GEOS, or another available option — based on your workflow needs.
Click Run to execute the validity check.
Review the three output layers: a valid layer, an invalid layer, and an error report. Use the Toggle Editing tool to manually fix any geometry errors found.

📌 Why this matters

Invalid geometry is one of the most common blockers in GIS workflows, causing spatial analysis tools, geoprocessing operations, and data exports to fail silently or produce incorrect results. QGIS's built-in Check Validity tool gives GIS professionals a fast, no-code way to detect self-intersections, unclosed polygons, and other geometry errors at scale. By separating features into valid, invalid, and error-report layers, QGIS makes it easy to pinpoint exactly which features need fixing without manual inspection. Mastering this workflow is essential for anyone maintaining clean, analysis-ready spatial datasets.

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