diff --git a/packages/super-editor/src/extensions/table/table.js b/packages/super-editor/src/extensions/table/table.js
index a3242a8865..139418ae12 100644
--- a/packages/super-editor/src/extensions/table/table.js
+++ b/packages/super-editor/src/extensions/table/table.js
@@ -233,6 +233,7 @@ const isImportedTableElement = (element) => Boolean(element?.closest?.(IMPORT_CO
  * @property {number} [rows=3] - Number of rows to create
  * @property {number} [cols=3] - Number of columns to create
  * @property {boolean} [withHeaderRow=false] - Create first row as header row
+ * @property {number[]} [columnWidths] - Explicit column widths in pixels
  */
 
 /**
@@ -554,11 +555,28 @@ export const Table = Node.create({
        * @example
        * editor.commands.insertTable()
        * editor.commands.insertTable({ rows: 3, cols: 3, withHeaderRow: true })
+       * editor.commands.insertTable({ rows: 3, cols: 3, columnWidths: [200, 100, 200] })
        */
       insertTable:
-        ({ rows = 3, cols = 3, withHeaderRow = false } = {}) =>
+        ({ rows = 3, cols = 3, withHeaderRow = false, columnWidths = null } = {}) =>
         ({ tr, dispatch, editor }) => {
-          const node = createTable(editor.schema, rows, cols, withHeaderRow);
+          let widths = columnWidths;
+
+          // If no widths provided, auto-calculate to fill available page width
+          if (!widths) {
+            const { pageSize = {}, pageMargins = {} } = editor.converter?.pageStyles ?? {};
+            const { width: pageWidth } = pageSize;
+            const { left = 0, right = 0 } = pageMargins;
+
+            if (pageWidth) {
+              // Page dimensions are in inches, convert to pixels (96 PPI)
+              const availableWidth = (pageWidth - left - right) * 96;
+              const columnWidth = Math.floor(availableWidth / cols);
+              widths = Array(cols).fill(columnWidth);
+            }
+          }
+
+          const node = createTable(editor.schema, rows, cols, withHeaderRow, null, widths);
 
           if (dispatch) {
             let offset = tr.selection.$from.end() + 1;
diff --git a/packages/super-editor/src/extensions/table/tableHelpers/createCell.js b/packages/super-editor/src/extensions/table/tableHelpers/createCell.js
index 81a4dce9cc..a7613f5197 100644
--- a/packages/super-editor/src/extensions/table/tableHelpers/createCell.js
+++ b/packages/super-editor/src/extensions/table/tableHelpers/createCell.js
@@ -1,7 +1,10 @@
 // @ts-check
-export const createCell = (cellType, cellContent = null) => {
+export const createCell = (cellType, cellContent = null, attrs = null) => {
   if (cellContent) {
-    return cellType.createChecked(null, cellContent);
+    return cellType.createChecked(attrs, cellContent);
+  }
+  if (attrs) {
+    return cellType.createAndFill(attrs);
   }
   return cellType.createAndFill();
 };
diff --git a/packages/super-editor/src/extensions/table/tableHelpers/createTable.js b/packages/super-editor/src/extensions/table/tableHelpers/createTable.js
index 749c9f38fe..783522b3e2 100644
--- a/packages/super-editor/src/extensions/table/tableHelpers/createTable.js
+++ b/packages/super-editor/src/extensions/table/tableHelpers/createTable.js
@@ -12,13 +12,16 @@ import { createTableBorders } from './createTableBorders.js';
  * @param {number} colsCount - Number of columns
  * @param {boolean} withHeaderRow - Create first row as header
  * @param {Object} [cellContent=null] - Initial cell content
+ * @param {number[]} [columnWidths=null] - Array of pixel widths per column
  * @returns {Object} Complete table node with borders
  * @example
  * const table = createTable(schema, 3, 3, true)
  * @example
  * const table = createTable(schema, 2, 4, false, paragraphNode)
+ * @example
+ * const table = createTable(schema, 3, 3, false, null, [200, 100, 200])
  */
-export const createTable = (schema, rowsCount, colsCount, withHeaderRow, cellContent = null) => {
+export const createTable = (schema, rowsCount, colsCount, withHeaderRow, cellContent = null, columnWidths = null) => {
   const types = {
     table: getNodeType('table', schema),
     tableRow: getNodeType('tableRow', schema),
@@ -30,10 +33,11 @@ export const createTable = (schema, rowsCount, colsCount, withHeaderRow, cellCon
   const cells = [];
 
   for (let index = 0; index < colsCount; index++) {
-    const cell = createCell(types.tableCell, cellContent);
+    const cellAttrs = columnWidths ? { colwidth: [columnWidths[index]] } : null;
+    const cell = createCell(types.tableCell, cellContent, cellAttrs);
     if (cell) cells.push(cell);
     if (withHeaderRow) {
-      const headerCell = createCell(types.tableHeader, cellContent);
+      const headerCell = createCell(types.tableHeader, cellContent, cellAttrs);
       if (headerCell) {
         headerCells.push(headerCell);
       }
diff --git a/packages/super-editor/src/extensions/table/tableHelpers/tableHelpers.test.js b/packages/super-editor/src/extensions/table/tableHelpers/tableHelpers.test.js
index 04c9f5f9a6..8d729b6634 100644
--- a/packages/super-editor/src/extensions/table/tableHelpers/tableHelpers.test.js
+++ b/packages/super-editor/src/extensions/table/tableHelpers/tableHelpers.test.js
@@ -94,6 +94,20 @@ describe('tableHelpers', () => {
     expect(filledCell.content.firstChild.textContent).toBe('Hello');
   });
 
+  it('createCell accepts attrs parameter for setting cell attributes', () => {
+    const cellType = schema.nodes.tableCell;
+
+    const cellWithWidth = createCell(cellType, null, { colwidth: [200] });
+    expect(cellWithWidth.type.name).toBe('tableCell');
+    expect(cellWithWidth.attrs.colwidth).toEqual([200]);
+
+    const cellWithContent = createCell(cellType, schema.nodes.paragraph.create(null, schema.text('Test')), {
+      colwidth: [150],
+    });
+    expect(cellWithContent.attrs.colwidth).toEqual([150]);
+    expect(cellWithContent.content.firstChild.textContent).toBe('Test');
+  });
+
   const buildRowTable = (widths, overrideCol, overrideValue) => {
     const cellType = schema.nodes.tableCell;
     const rowType = schema.nodes.tableRow;
@@ -166,6 +180,52 @@ describe('tableHelpers', () => {
     expect(headerCell.type.name).toBe('tableHeader');
   });
 
+  it('createTable applies column widths when provided', () => {
+    const columnWidths = [200, 100, 200];
+    const table = createTable(schema, 2, 3, false, null, columnWidths);
+
+    expect(table.type.name).toBe('table');
+    expect(table.childCount).toBe(2); // 2 rows
+
+    // Check first row cells have correct widths
+    const firstRow = table.firstChild;
+    expect(firstRow.childCount).toBe(3);
+    expect(firstRow.child(0).attrs.colwidth).toEqual([200]);
+    expect(firstRow.child(1).attrs.colwidth).toEqual([100]);
+    expect(firstRow.child(2).attrs.colwidth).toEqual([200]);
+
+    // Check second row cells also have correct widths
+    const secondRow = table.child(1);
+    expect(secondRow.child(0).attrs.colwidth).toEqual([200]);
+    expect(secondRow.child(1).attrs.colwidth).toEqual([100]);
+    expect(secondRow.child(2).attrs.colwidth).toEqual([200]);
+  });
+
+  it('createTable applies column widths to header row when withHeaderRow is true', () => {
+    const columnWidths = [150, 150];
+    const table = createTable(schema, 2, 2, true, null, columnWidths);
+
+    // First row should be header cells with widths
+    const headerRow = table.firstChild;
+    expect(headerRow.child(0).type.name).toBe('tableHeader');
+    expect(headerRow.child(0).attrs.colwidth).toEqual([150]);
+    expect(headerRow.child(1).attrs.colwidth).toEqual([150]);
+
+    // Second row should be regular cells with widths
+    const bodyRow = table.child(1);
+    expect(bodyRow.child(0).type.name).toBe('tableCell');
+    expect(bodyRow.child(0).attrs.colwidth).toEqual([150]);
+  });
+
+  it('createTable uses default widths when columnWidths is null', () => {
+    const table = createTable(schema, 1, 2, false, null, null);
+
+    const firstRow = table.firstChild;
+    // Default colwidth from schema is [100]
+    expect(firstRow.child(0).attrs.colwidth).toEqual([100]);
+    expect(firstRow.child(1).attrs.colwidth).toEqual([100]);
+  });
+
   it('createTableBorders assigns uniform border configuration', () => {
     const borders = createTableBorders({ size: 2, color: '#ccc' });
     expect(borders.top).toEqual({ size: 2, color: '#ccc' });
diff --git a/tests/behavior/tests/tables/insert-table-column-widths.spec.ts b/tests/behavior/tests/tables/insert-table-column-widths.spec.ts
new file mode 100644
index 0000000000..0f25963a42
--- /dev/null
+++ b/tests/behavior/tests/tables/insert-table-column-widths.spec.ts
@@ -0,0 +1,110 @@
+import { test, expect } from '../../fixtures/superdoc.js';
+import type { Page } from '@playwright/test';
+
+test.use({ config: { toolbar: 'none' } });
+
+/** Read colwidth arrays from every cell in the first table found in the document. */
+async function getCellColwidths(page: Page): Promise<(number[] | null)[]> {
+  return page.evaluate(() => {
+    const doc = (window as any).editor.state.doc;
+    const widths: (number[] | null)[] = [];
+    let inTable = false;
+
+    doc.descendants((node: any) => {
+      if (node.type.name === 'table') {
+        inTable = true;
+        return true; // descend into this table
+      }
+      if (inTable && (node.type.name === 'tableCell' || node.type.name === 'tableHeader')) {
+        widths.push(node.attrs.colwidth ?? null);
+      }
+    });
+
+    return widths;
+  });
+}
+
+test.describe('insertTable column widths', () => {
+  test('auto-calculates equal column widths from page dimensions', async ({ superdoc }) => {
+    await superdoc.executeCommand('insertTable', { rows: 3, cols: 3 });
+    await superdoc.waitForStable();
+
+    await superdoc.assertTableExists(3, 3);
+
+    const colwidths = await getCellColwidths(superdoc.page);
+
+    // Every cell should have a colwidth set (not null)
+    for (const cw of colwidths) {
+      expect(cw).not.toBeNull();
+      expect(cw).toHaveLength(1);
+    }
+
+    // All columns should have the same width (equal division of page width)
+    const uniqueWidths = new Set(colwidths.map((cw) => cw![0]));
+    expect(uniqueWidths.size).toBe(1);
+
+    // The auto-calculated width should be a reasonable page-derived value (not the 100px default)
+    const autoWidth = colwidths[0]![0];
+    expect(autoWidth).toBeGreaterThan(100);
+  });
+
+  test('uses explicit columnWidths when provided', async ({ superdoc }) => {
+    const explicitWidths = [200, 100, 200];
+
+    await superdoc.executeCommand('insertTable', {
+      rows: 2,
+      cols: 3,
+      columnWidths: explicitWidths,
+    });
+    await superdoc.waitForStable();
+
+    await superdoc.assertTableExists(2, 3);
+
+    const colwidths = await getCellColwidths(superdoc.page);
+
+    // 2 rows x 3 cols = 6 cells
+    expect(colwidths).toHaveLength(6);
+
+    // Each cell's colwidth should match the explicit width for its column
+    for (let row = 0; row < 2; row++) {
+      for (let col = 0; col < 3; col++) {
+        const cellIndex = row * 3 + col;
+        expect(colwidths[cellIndex]).toEqual([explicitWidths[col]]);
+      }
+    }
+  });
+
+  test('auto widths differ from explicit widths', async ({ superdoc }) => {
+    // Insert table with auto widths
+    await superdoc.executeCommand('insertTable', { rows: 2, cols: 3 });
+    await superdoc.waitForStable();
+
+    const autoColwidths = await getCellColwidths(superdoc.page);
+    const autoWidth = autoColwidths[0]![0];
+
+    // Clear the editor and insert with explicit widths
+    await superdoc.selectAll();
+    await superdoc.press('Backspace');
+    await superdoc.waitForStable();
+
+    await superdoc.executeCommand('insertTable', {
+      rows: 2,
+      cols: 3,
+      columnWidths: [200, 100, 200],
+    });
+    await superdoc.waitForStable();
+
+    const explicitColwidths = await getCellColwidths(superdoc.page);
+
+    // Auto-calculated widths should all be equal
+    expect(autoColwidths[0]![0]).toBe(autoColwidths[1]![0]);
+    expect(autoColwidths[1]![0]).toBe(autoColwidths[2]![0]);
+
+    // Explicit widths should not all be equal
+    expect(explicitColwidths[0]![0]).not.toBe(explicitColwidths[1]![0]);
+
+    // The auto width should differ from any of the explicit widths
+    expect(autoWidth).not.toBe(200);
+    expect(autoWidth).not.toBe(100);
+  });
+});
diff --git a/tests/behavior/tests/tables/resize.spec.ts b/tests/behavior/tests/tables/resize.spec.ts
index ea6a85af30..744b1fe129 100644
--- a/tests/behavior/tests/tables/resize.spec.ts
+++ b/tests/behavior/tests/tables/resize.spec.ts
@@ -89,7 +89,8 @@ test('resize a column by dragging its boundary', async ({ superdoc }) => {
 });
 
 test('resize the table by dragging the right edge', async ({ superdoc }) => {
-  await superdoc.executeCommand('insertTable', { rows: 3, cols: 3, withHeaderRow: false });
+  // Use narrow explicit widths so the table has room to expand rightward
+  await superdoc.executeCommand('insertTable', { rows: 3, cols: 3, columnWidths: [100, 100, 100] });
   await superdoc.waitForStable();
 
   await superdoc.type('Content');