diff --git a/demo/client/client.ts b/demo/client/client.ts
index fa249a9e..77020680 100644
--- a/demo/client/client.ts
+++ b/demo/client/client.ts
@@ -328,7 +328,9 @@ function createTerminal(): Terminal {
     }
     const cols = size.cols;
     const rows = size.rows;
-    const url = '/terminals/' + pid + '/size?cols=' + cols + '&rows=' + rows;
+    const pixelWidth = Math.round(term!.dimensions?.css?.canvas?.width ?? 0);
+    const pixelHeight = Math.round(term!.dimensions?.css?.canvas?.height ?? 0);
+    const url = '/terminals/' + pid + '/size?cols=' + cols + '&rows=' + rows + '&pixelWidth=' + pixelWidth + '&pixelHeight=' + pixelHeight;
 
     fetch(url, { method: 'POST' });
   });
@@ -379,7 +381,9 @@ function createTerminal(): Terminal {
     if (useRealTerminal instanceof HTMLInputElement && !useRealTerminal.checked) {
       runFakeTerminal();
     } else {
-      const res = await fetch('/terminals?cols=' + term!.cols + '&rows=' + term!.rows, { method: 'POST' });
+      const pixelWidth = Math.round(term!.dimensions?.css?.canvas?.width ?? 0);
+      const pixelHeight = Math.round(term!.dimensions?.css?.canvas?.height ?? 0);
+      const res = await fetch('/terminals?cols=' + term!.cols + '&rows=' + term!.rows + '&pixelWidth=' + pixelWidth + '&pixelHeight=' + pixelHeight, { method: 'POST' });
       const processId = await res.text();
       pid = processId;
       socketURL += processId;
@@ -626,7 +630,7 @@ function updateTerminalSize(): void {
   function getBox(width: number, height: number): any {
     return {
       string: '+',
-      style: 'font-size: 1px; padding: ' + Math.floor(height/2) + 'px ' + Math.floor(width/2) + 'px; line-height: ' + height + 'px;'
+      style: 'font-size: 1px; padding: ' + Math.floor(height / 2) + 'px ' + Math.floor(width / 2) + 'px; line-height: ' + height + 'px;'
     };
   }
   if (source instanceof HTMLCanvasElement) {
diff --git a/demo/server/server.ts b/demo/server/server.ts
index 0f4a79b3..ef98eb84 100644
--- a/demo/server/server.ts
+++ b/demo/server/server.ts
@@ -65,6 +65,8 @@ function startServer(): void {
     }
     const cols = parseInt(req.query.cols);
     const rows = parseInt(req.query.rows);
+    const pixelWidth = typeof req.query.pixelWidth === 'string' ? parseInt(req.query.pixelWidth) : 0;
+    const pixelHeight = typeof req.query.pixelHeight === 'string' ? parseInt(req.query.pixelHeight) : 0;
     const isWindows = process.platform === 'win32';
     const term = pty.spawn(isWindows ? 'powershell.exe' : 'bash', [], {
       name: 'xterm-256color',
@@ -77,7 +79,13 @@ function startServer(): void {
       useConptyDll: isWindows,
     });
 
-    console.log('Created terminal with PID: ' + term.pid);
+    // Set pixel dimensions immediately after spawn (pty.spawn doesn't support them)
+    if (pixelWidth > 0 && pixelHeight > 0) {
+      term.resize(cols, rows, { width: pixelWidth, height: pixelHeight });
+      console.log('Created terminal with PID: ' + term.pid + ' (' + cols + 'x' + rows + ', ' + pixelWidth + 'px x ' + pixelHeight + 'px)');
+    } else {
+      console.log('Created terminal with PID: ' + term.pid);
+    }
     terminals[term.pid] = term;
     unsentOutput[term.pid] = '';
     temporaryDisposable[term.pid] = term.onData(function(data) {
@@ -95,10 +103,17 @@ function startServer(): void {
     const pid = parseInt(req.params.pid);
     const cols = parseInt(req.query.cols);
     const rows = parseInt(req.query.rows);
+    const pixelWidth = typeof req.query.pixelWidth === 'string' ? parseInt(req.query.pixelWidth) : 0;
+    const pixelHeight = typeof req.query.pixelHeight === 'string' ? parseInt(req.query.pixelHeight) : 0;
     const term = terminals[pid];
 
-    term.resize(cols, rows);
-    console.log('Resized terminal ' + pid + ' to ' + cols + ' cols and ' + rows + ' rows.');
+    if (pixelWidth > 0 && pixelHeight > 0) {
+      term.resize(cols, rows, { width: pixelWidth, height: pixelHeight });
+      console.log('Resized terminal ' + pid + ' to ' + cols + ' cols, ' + rows + ' rows, ' + pixelWidth + 'px x ' + pixelHeight + 'px');
+    } else {
+      term.resize(cols, rows);
+      console.log('Resized terminal ' + pid + ' to ' + cols + ' cols and ' + rows + ' rows.');
+    }
     res.end();
   });