diff --git a/src/components/__tests__/SettingsTab.test.tsx b/src/components/__tests__/SettingsTab.test.tsx
new file mode 100644
index 0000000..08876dc
--- /dev/null
+++ b/src/components/__tests__/SettingsTab.test.tsx
@@ -0,0 +1,107 @@
+// @vitest-environment jsdom
+import { render, screen, fireEvent } from "@testing-library/react";
+import { describe, expect, it, vi, beforeEach } from "vitest";
+import { SettingsTab } from "../SettingsTab";
+import { MAIN_BLOCKS, DETAIL_OPTIONS } from "@/lib/cardGeneratorConstants";
+import type { CardDisplayOptions, CardBlockId } from "@/lib/types";
+import "@testing-library/jest-dom";
+
+describe("SettingsTab", () => {
+  const mockIsBlockVisible = vi.fn();
+  const mockToggleMainBlockVisibility = vi.fn();
+  const mockToggleDisplayOption = vi.fn();
+
+  const defaultProps = {
+    isBlockVisible: mockIsBlockVisible,
+    toggleMainBlockVisibility: mockToggleMainBlockVisibility,
+    displayOptions: {} as CardDisplayOptions,
+    toggleDisplayOption: mockToggleDisplayOption,
+  };
+
+  beforeEach(() => {
+    vi.resetAllMocks();
+  });
+
+  it("renders all MAIN_BLOCKS checkboxes", () => {
+    mockIsBlockVisible.mockReturnValue(false);
+    render(<SettingsTab {...defaultProps} />);
+
+    MAIN_BLOCKS.forEach(({ label }) => {
+      const checkbox = screen.getByLabelText(label);
+      expect(checkbox).toBeInTheDocument();
+      expect(checkbox).toHaveAttribute("type", "checkbox");
+      expect(checkbox).not.toBeChecked();
+    });
+  });
+
+  it("renders all DETAIL_OPTIONS checkboxes", () => {
+    render(<SettingsTab {...defaultProps} />);
+
+    DETAIL_OPTIONS.forEach(({ label }) => {
+      const checkbox = screen.getByLabelText(label);
+      expect(checkbox).toBeInTheDocument();
+      expect(checkbox).toHaveAttribute("type", "checkbox");
+      expect(checkbox).not.toBeChecked();
+    });
+  });
+
+  it("sets MAIN_BLOCKS checkbox checked state based on isBlockVisible prop", () => {
+    // Mock that 'profile' and 'skills' are visible, others are not
+    mockIsBlockVisible.mockImplementation((id: CardBlockId) => id === "profile" || id === "skills");
+
+    render(<SettingsTab {...defaultProps} />);
+
+    MAIN_BLOCKS.forEach(({ id, label }) => {
+      const checkbox = screen.getByLabelText(label);
+      if (id === "profile" || id === "skills") {
+        expect(checkbox).toBeChecked();
+      } else {
+        expect(checkbox).not.toBeChecked();
+      }
+    });
+  });
+
+  it("sets DETAIL_OPTIONS checkbox checked state based on displayOptions prop", () => {
+    const displayOptions: CardDisplayOptions = {
+      showAvatar: true,
+      showLocation: true,
+      // Others are implicitly false or undefined
+    };
+
+    render(<SettingsTab {...defaultProps} displayOptions={displayOptions} />);
+
+    DETAIL_OPTIONS.forEach(({ key, label }) => {
+      const checkbox = screen.getByLabelText(label);
+      if (key === "showAvatar" || key === "showLocation") {
+        expect(checkbox).toBeChecked();
+      } else {
+        expect(checkbox).not.toBeChecked();
+      }
+    });
+  });
+
+  it("calls toggleMainBlockVisibility with correct id when MAIN_BLOCKS checkbox is clicked", () => {
+    mockIsBlockVisible.mockReturnValue(false);
+    render(<SettingsTab {...defaultProps} />);
+
+    const firstMainBlock = MAIN_BLOCKS[0];
+    const checkbox = screen.getByLabelText(firstMainBlock.label);
+
+    fireEvent.click(checkbox);
+
+    expect(mockToggleMainBlockVisibility).toHaveBeenCalledTimes(1);
+    expect(mockToggleMainBlockVisibility).toHaveBeenCalledWith(firstMainBlock.id);
+  });
+
+  it("calls toggleDisplayOption with correct key when DETAIL_OPTIONS checkbox is clicked", () => {
+    render(<SettingsTab {...defaultProps} />);
+
+    const firstDetailOption = DETAIL_OPTIONS[0];
+    const checkbox = screen.getByLabelText(firstDetailOption.label);
+
+    fireEvent.click(checkbox);
+
+    expect(mockToggleDisplayOption).toHaveBeenCalledTimes(1);
+    expect(mockToggleDisplayOption).toHaveBeenCalledWith(firstDetailOption.key);
+  });
+});
diff --git a/vitest.config.ts b/vitest.config.ts
index 9404856..eaff66e 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -21,7 +21,9 @@ export default defineConfig({
         "src/components/LanguageChart.tsx",
         "src/components/SkillsCard.tsx",
         "src/components/LayoutEditor.tsx",
+        "src/components/SettingsTab.tsx",
         "src/lib/rateLimit.ts",
+
         "src/app/api/og/[username]/route.tsx"
       ],
       thresholds: {