diff --git a/.changeset/shaggy-terms-grin.md b/.changeset/shaggy-terms-grin.md
new file mode 100644
index 00000000..a7a671bf
--- /dev/null
+++ b/.changeset/shaggy-terms-grin.md
@@ -0,0 +1,9 @@
+---
+"streamdown": minor
+---
+
+Fix table copy and download actions not working in fullscreen mode.
+
+- Support table lookup inside the fullscreen portal container.
+- Restore copy and download functionality for fullscreen tables.
+- Keep existing inline table controls behavior unchanged.
diff --git a/packages/streamdown/__tests__/table-dropdowns.test.tsx b/packages/streamdown/__tests__/table-dropdowns.test.tsx
index ec1e47d8..08e9391a 100644
--- a/packages/streamdown/__tests__/table-dropdowns.test.tsx
+++ b/packages/streamdown/__tests__/table-dropdowns.test.tsx
@@ -114,6 +114,57 @@ describe("TableDownloadDropdown", () => {
     expect(onDownload).toHaveBeenCalledWith("markdown");
   });
 
+  it("should download when inside table-fullscreen", async () => {
+    const { save } = await import("../lib/utils");
+    const onDownload = vi.fn();
+
+    const { container } = render(
+      <StreamdownContext.Provider
+        value={{
+          shikiTheme: ["github-light", "github-dark"],
+          controls: true,
+          isAnimating: false,
+          mode: "streaming",
+        }}
+      >
+        <div data-streamdown="table-fullscreen">
+          <table>
+            <thead>
+              <tr>
+                <th>Name</th>
+                <th>Age</th>
+              </tr>
+            </thead>
+            <tbody>
+              <tr>
+                <td>Alice</td>
+                <td>30</td>
+              </tr>
+            </tbody>
+          </table>
+          <TableDownloadDropdown onDownload={onDownload} />
+        </div>
+      </StreamdownContext.Provider>
+    );
+
+    const toggleBtn = container.querySelector('button[title="Download table"]');
+    // biome-ignore lint/style/noNonNullAssertion: test assertion
+    fireEvent.click(toggleBtn!);
+
+    const csvBtn = container.querySelector(
+      'button[title="Download table as CSV"]'
+    );
+    // biome-ignore lint/style/noNonNullAssertion: test assertion
+    fireEvent.click(csvBtn!);
+
+    expect(save).toHaveBeenCalledWith(
+      "table.csv",
+      expect.any(String),
+      "text/csv"
+    );
+    expect(onDownload).toHaveBeenCalledWith("csv");
+  });
+
   it("should call onError when save throws", async () => {
     const { save } = await import("../lib/utils");
     (save as any).mockImplementation(() => {
@@ -242,6 +293,44 @@ describe("TableDownloadButton with format='markdown'", () => {
 
     expect(onError).toHaveBeenCalledWith(expect.any(Error));
   });
+
+  it("should download when inside table-fullscreen", () => {
+    const onDownload = vi.fn();
+    const { container } = render(
+      <StreamdownContext.Provider
+        value={{
+          shikiTheme: ["github-light", "github-dark"],
+          controls: true,
+          isAnimating: false,
+          mode: "streaming",
+        }}
+      >
+        <div data-streamdown="table-fullscreen">
+          <table>
+            <thead>
+              <tr>
+                <th>Name</th>
+                <th>Age</th>
+              </tr>
+            </thead>
+            <tbody>
+              <tr>
+                <td>Alice</td>
+                <td>30</td>
+              </tr>
+            </tbody>
+          </table>
+          <TableDownloadButton onDownload={onDownload} />
+        </div>
+      </StreamdownContext.Provider>
+    );
+
+    const btn = container.querySelector("button");
+    // biome-ignore lint/style/noNonNullAssertion: test assertion
+    fireEvent.click(btn!);
+
+    expect(onDownload).toHaveBeenCalled();
+  });
 });
 
 describe("TableCopyDropdown", () => {
@@ -408,6 +497,51 @@ describe("TableCopyDropdown", () => {
     expect(onError).toHaveBeenCalledWith(expect.any(Error));
   });
 
+  it("should copy when inside table-fullscreen", async () => {
+    const onCopy = vi.fn();
+    const { container } = render(
+      <StreamdownContext.Provider
+        value={{
+          shikiTheme: ["github-light", "github-dark"],
+          controls: true,
+          isAnimating: false,
+          mode: "streaming",
+        }}
+      >
+        <div data-streamdown="table-fullscreen">
+          <table>
+            <thead>
+              <tr>
+                <th>Name</th>
+                <th>Age</th>
+              </tr>
+            </thead>
+            <tbody>
+              <tr>
+                <td>Alice</td>
+                <td>30</td>
+              </tr>
+            </tbody>
+          </table>
+          <TableCopyDropdown onCopy={onCopy} />
+        </div>
+      </StreamdownContext.Provider>
+    );
+
+    const toggleBtn = container.querySelector('button[title="Copy table"]');
+    // biome-ignore lint/style/noNonNullAssertion: test assertion
+    fireEvent.click(toggleBtn!);
+
+    const csvBtn = container.querySelector('button[title="Copy table as CSV"]');
+    // biome-ignore lint/suspicious/useAwait: act needs async to flush clipboard promises
+    await act(async () => {
+      // biome-ignore lint/style/noNonNullAssertion: test assertion
+      fireEvent.click(csvBtn!);
+    });
+
+    expect(onCopy).toHaveBeenCalledWith("csv");
+  });
+
   it("should close dropdown on outside click", () => {
     const { container } = renderInTableWrapper(<TableCopyDropdown />);
 
diff --git a/packages/streamdown/__tests__/table-fullscreen.test.tsx b/packages/streamdown/__tests__/table-fullscreen.test.tsx
index 84d74699..2199a395 100644
--- a/packages/streamdown/__tests__/table-fullscreen.test.tsx
+++ b/packages/streamdown/__tests__/table-fullscreen.test.tsx
@@ -1,7 +1,15 @@
-import { fireEvent, render } from "@testing-library/react";
-import { describe, expect, it } from "vitest";
+import { act, fireEvent, render } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import { Streamdown } from "../index";
 
+vi.mock("../lib/utils", async () => {
+  const actual = await vi.importActual("../lib/utils");
+  return {
+    ...actual,
+    save: vi.fn(),
+  };
+});
+
 const markdownWithTable = `
 | Name | Age |
 |------|-----|
@@ -308,4 +316,150 @@ describe("TableFullscreenButton", () => {
     const copyBtn = overlay?.querySelector('button[title="Copy table"]');
     expect(copyBtn).toBeFalsy();
   });
+
+  it("should show copy format options in fullscreen", () => {
+    const { container } = render(<Streamdown>{markdownWithTable}</Streamdown>);
+
+    const btn = container.querySelector(
+      'button[title="View fullscreen"]'
+    ) as HTMLButtonElement;
+    fireEvent.click(btn);
+
+    const overlay = document.querySelector(
+      '[data-streamdown="table-fullscreen"]'
+    );
+    const copyBtn = overlay?.querySelector(
+      'button[title="Copy table"]'
+    ) as HTMLButtonElement;
+    fireEvent.click(copyBtn);
+
+    expect(
+      overlay?.querySelector('button[title="Copy table as CSV"]')
+    ).toBeTruthy();
+    expect(
+      overlay?.querySelector('button[title="Copy table as Markdown"]')
+    ).toBeTruthy();
+    expect(
+      overlay?.querySelector('button[title="Copy table as TSV"]')
+    ).toBeTruthy();
+  });
+
+  it("should show download format options in fullscreen", () => {
+    const { container } = render(<Streamdown>{markdownWithTable}</Streamdown>);
+
+    const btn = container.querySelector(
+      'button[title="View fullscreen"]'
+    ) as HTMLButtonElement;
+    fireEvent.click(btn);
+
+    const overlay = document.querySelector(
+      '[data-streamdown="table-fullscreen"]'
+    );
+    const downloadBtn = overlay?.querySelector(
+      'button[title="Download table"]'
+    ) as HTMLButtonElement;
+    fireEvent.click(downloadBtn);
+
+    expect(
+      overlay?.querySelector('button[title="Download table as CSV"]')
+    ).toBeTruthy();
+    expect(
+      overlay?.querySelector('button[title="Download table as Markdown"]')
+    ).toBeTruthy();
+  });
+});
+
+describe("TableFullscreenButton copy and download", () => {
+  const originalClipboard = navigator.clipboard;
+  const originalClipboardItem = globalThis.ClipboardItem;
+
+  beforeEach(() => {
+    vi.clearAllMocks();
+    Object.defineProperty(navigator, "clipboard", {
+      value: {
+        write: vi.fn().mockResolvedValue(undefined),
+        writeText: vi.fn().mockResolvedValue(undefined),
+      },
+      writable: true,
+      configurable: true,
+    });
+    if (!globalThis.ClipboardItem) {
+      globalThis.ClipboardItem = class {
+        types: string[];
+        data: Record<string, Blob>;
+        constructor(data: Record<string, Blob>) {
+          this.types = Object.keys(data);
+          this.data = data;
+        }
+      } as any;
+    }
+  });
+
+  afterEach(() => {
+    vi.restoreAllMocks();
+    Object.defineProperty(navigator, "clipboard", {
+      value: originalClipboard,
+      writable: true,
+      configurable: true,
+    });
+    if (originalClipboardItem) {
+      globalThis.ClipboardItem = originalClipboardItem;
+    }
+  });
+
+  it("should copy table as CSV in fullscreen", async () => {
+    const { container } = render(<Streamdown>{markdownWithTable}</Streamdown>);
+
+    const btn = container.querySelector(
+      'button[title="View fullscreen"]'
+    ) as HTMLButtonElement;
+    fireEvent.click(btn);
+
+    const overlay = document.querySelector(
+      '[data-streamdown="table-fullscreen"]'
+    );
+    const copyBtn = overlay?.querySelector(
+      'button[title="Copy table"]'
+    ) as HTMLButtonElement;
+    fireEvent.click(copyBtn);
+
+    const csvBtn = overlay?.querySelector(
+      'button[title="Copy table as CSV"]'
+    ) as HTMLButtonElement;
+    // biome-ignore lint/suspicious/useAwait: act needs async to flush clipboard promises
+    await act(async () => {
+      fireEvent.click(csvBtn);
+    });
+
+    expect(navigator.clipboard.write).toHaveBeenCalled();
+  });
+
+  it("should download table as CSV in fullscreen", async () => {
+    const { save } = await import("../lib/utils");
+    const { container } = render(<Streamdown>{markdownWithTable}</Streamdown>);
+
+    const btn = container.querySelector(
+      'button[title="View fullscreen"]'
+    ) as HTMLButtonElement;
+    fireEvent.click(btn);
+
+    const overlay = document.querySelector(
+      '[data-streamdown="table-fullscreen"]'
+    );
+    const downloadBtn = overlay?.querySelector(
+      'button[title="Download table"]'
+    ) as HTMLButtonElement;
+    fireEvent.click(downloadBtn);
+
+    const csvBtn = overlay?.querySelector(
+      'button[title="Download table as CSV"]'
+    ) as HTMLButtonElement;
+    fireEvent.click(csvBtn);
+
+    expect(save).toHaveBeenCalledWith(
+      "table.csv",
+      expect.any(String),
+      "text/csv"
+    );
+  });
 });
diff --git a/packages/streamdown/lib/table/copy-dropdown.tsx b/packages/streamdown/lib/table/copy-dropdown.tsx
index f019a9fd..361271f0 100644
--- a/packages/streamdown/lib/table/copy-dropdown.tsx
+++ b/packages/streamdown/lib/table/copy-dropdown.tsx
@@ -41,7 +41,7 @@ export const TableCopyDropdown = ({
 
     try {
       const tableWrapper = dropdownRef.current?.closest(
-        '[data-streamdown="table-wrapper"]'
+        '[data-streamdown="table-wrapper"], [data-streamdown="table-fullscreen"]'
       );
       const tableElement = tableWrapper?.querySelector(
         "table"
diff --git a/packages/streamdown/lib/table/download-dropdown.tsx b/packages/streamdown/lib/table/download-dropdown.tsx
index ead50cf8..d8178aa6 100644
--- a/packages/streamdown/lib/table/download-dropdown.tsx
+++ b/packages/streamdown/lib/table/download-dropdown.tsx
@@ -36,7 +36,9 @@ export const TableDownloadButton = ({
     try {
       // Find the closest table element
       const button = event.currentTarget;
-      const tableWrapper = button.closest('[data-streamdown="table-wrapper"]');
+      const tableWrapper = button.closest(
+        '[data-streamdown="table-wrapper"], [data-streamdown="table-fullscreen"]'
+      );
       const tableElement = tableWrapper?.querySelector(
         "table"
       ) as HTMLTableElement;
@@ -117,7 +119,7 @@ export const TableDownloadDropdown = ({
   const downloadTableData = (format: "csv" | "markdown") => {
     try {
       const tableWrapper = dropdownRef.current?.closest(
-        '[data-streamdown="table-wrapper"]'
+        '[data-streamdown="table-wrapper"], [data-streamdown="table-fullscreen"]'
       );
       const tableElement = tableWrapper?.querySelector(
         "table"