diff --git a/Sources/Kysect.Configuin.EditorConfig/Formatter/EditorConfigFormatter.cs b/Sources/Kysect.Configuin.EditorConfig/Formatter/EditorConfigFormatter.cs
new file mode 100644
index 0000000..74d12bb
--- /dev/null
+++ b/Sources/Kysect.Configuin.EditorConfig/Formatter/EditorConfigFormatter.cs
@@ -0,0 +1,79 @@
+using Kysect.CommonLib.Collections.Extensions;
+using Kysect.Configuin.EditorConfig.DocumentModel;
+using Kysect.Configuin.EditorConfig.DocumentModel.Nodes;
+using Kysect.Configuin.EditorConfig.Settings;
+using Kysect.Configuin.RoslynModels;
+
+namespace Kysect.Configuin.EditorConfig.Formatter;
+
+public class EditorConfigFormatter
+{
+    private readonly DotnetConfigSettingsParser _settingsParser;
+
+    public EditorConfigFormatter(DotnetConfigSettingsParser settingsParser)
+    {
+        _settingsParser = settingsParser;
+    }
+
+    public EditorConfigDocument Format(EditorConfigDocument value)
+    {
+        List<EditorConfigPropertyNode> nodesForRemoving = new List<EditorConfigPropertyNode>();
+        IReadOnlyCollection<EditorConfigPropertyNode> styleRuleNodesForMoving = SelectIdeNodes(value, RoslynRuleType.StyleRule);
+        IReadOnlyCollection<EditorConfigPropertyNode> qualityRuleNodesForMoving = SelectIdeNodes(value, RoslynRuleType.QualityRule);
+        nodesForRemoving.AddRange(styleRuleNodesForMoving);
+        nodesForRemoving.AddRange(qualityRuleNodesForMoving);
+
+        if (nodesForRemoving.IsEmpty())
+            return value;
+
+        value = value.RemoveNodes(nodesForRemoving);
+        var autoGeneratedSection = new EditorConfigCategoryNode("*.cs", [], ["# Autoformatted values"], null);
+
+        if (styleRuleNodesForMoving.Any())
+        {
+            var styleRuleSection = new EditorConfigDocumentSectionNode("### IDE ###");
+
+            styleRuleNodesForMoving = styleRuleNodesForMoving.OrderBy(r => r.Key.Value).ToList();
+            foreach (EditorConfigPropertyNode styleRule in styleRuleNodesForMoving)
+                styleRuleSection = styleRuleSection.AddChild(styleRule);
+
+            autoGeneratedSection = autoGeneratedSection.AddChild(styleRuleSection);
+        }
+
+        if (qualityRuleNodesForMoving.Any())
+        {
+            var qualitySection = new EditorConfigDocumentSectionNode("### CA ###");
+
+            qualityRuleNodesForMoving = qualityRuleNodesForMoving.OrderBy(r => r.Key.Value).ToList();
+            foreach (EditorConfigPropertyNode qualityRule in qualityRuleNodesForMoving)
+                qualitySection = qualitySection.AddChild(qualityRule);
+
+            autoGeneratedSection = autoGeneratedSection.AddChild(qualitySection);
+        }
+
+        value = value.AddChild(autoGeneratedSection);
+
+        return value;
+    }
+
+    public IReadOnlyCollection<EditorConfigPropertyNode> SelectIdeNodes(EditorConfigDocument document, RoslynRuleType roslynRuleType)
+    {
+        List<EditorConfigPropertyNode> propertyNodes = document
+            .DescendantNodes()
+            .OfType<EditorConfigPropertyNode>()
+            .ToList();
+
+        List<EditorConfigPropertyNode> styleRuleNodes = new List<EditorConfigPropertyNode>();
+        foreach (EditorConfigPropertyNode editorConfigPropertyNode in propertyNodes)
+        {
+            IEditorConfigSetting editorConfigSetting = _settingsParser.ParseSetting(editorConfigPropertyNode);
+            if (editorConfigSetting is not RoslynSeverityEditorConfigSetting severityConfigSetting)
+                continue;
+
+            if (severityConfigSetting.RuleId.Type == roslynRuleType)
+                styleRuleNodes.Add(editorConfigPropertyNode);
+        }
+
+        return styleRuleNodes;
+    }
+}
\ No newline at end of file
diff --git a/Sources/Kysect.Configuin.Tests/EditorConfig/EditorConfigFormatterTests.cs b/Sources/Kysect.Configuin.Tests/EditorConfig/EditorConfigFormatterTests.cs
new file mode 100644
index 0000000..291f631
--- /dev/null
+++ b/Sources/Kysect.Configuin.Tests/EditorConfig/EditorConfigFormatterTests.cs
@@ -0,0 +1,79 @@
+using Kysect.Configuin.EditorConfig;
+using Kysect.Configuin.EditorConfig.DocumentModel;
+using Kysect.Configuin.EditorConfig.DocumentModel.Nodes;
+using Kysect.Configuin.EditorConfig.Formatter;
+using Kysect.Configuin.Tests.Tools;
+
+namespace Kysect.Configuin.Tests.EditorConfig;
+
+public class EditorConfigFormatterTests
+{
+    private readonly EditorConfigFormatter _formatter;
+    private readonly EditorConfigDocumentParser _parser;
+
+    public EditorConfigFormatterTests()
+    {
+        _formatter = new EditorConfigFormatter(new DotnetConfigSettingsParser(TestLogger.ProviderForTests()));
+        _parser = new EditorConfigDocumentParser();
+    }
+
+    [Fact]
+    public void Format_OrderedIdeRulesWithoutHeader_HeaderAdded()
+    {
+        var input = """
+                    first = value
+                    dotnet_diagnostic.IDE0081.severity = none
+                    dotnet_diagnostic.IDE0080.severity = none
+                    dotnet_diagnostic.IDE0082.severity = warning
+                    second = value
+                    """;
+
+        var expected = """
+                       first = value
+                       second = value
+                       # Autoformatted values
+                       [*.cs]
+                       ### IDE ###
+                       dotnet_diagnostic.IDE0080.severity = none
+                       dotnet_diagnostic.IDE0081.severity = none
+                       dotnet_diagnostic.IDE0082.severity = warning
+                       """;
+
+        FormatAndCompare(input, expected);
+    }
+
+    [Fact]
+    public void Format_QualityAndStyleRulesMashed_ReturnOrderedLinesWithHeader()
+    {
+        var input = """
+                    first = value
+                    dotnet_diagnostic.IDE0081.severity = none
+                    dotnet_diagnostic.CA2001.severity = none
+                    second = value
+                    dotnet_diagnostic.IDE0080.severity = none
+                    dotnet_diagnostic.CA2000.severity = warning
+                    """;
+
+        var expected = """
+                       first = value
+                       second = value
+                       # Autoformatted values
+                       [*.cs]
+                       ### IDE ###
+                       dotnet_diagnostic.IDE0080.severity = none
+                       dotnet_diagnostic.IDE0081.severity = none
+                       ### CA ###
+                       dotnet_diagnostic.CA2000.severity = warning
+                       dotnet_diagnostic.CA2001.severity = none
+                       """;
+
+        FormatAndCompare(input, expected);
+    }
+
+    private void FormatAndCompare(string input, string expected)
+    {
+        EditorConfigDocument editorConfigDocument = _parser.Parse(input);
+        EditorConfigDocument formattedDocument = _formatter.Format(editorConfigDocument);
+        formattedDocument.ToFullString().Should().Be(expected);
+    }
+}
\ No newline at end of file