diff --git a/core/browser.py b/core/browser.py
index 62ce7ad..2cf6fff 100644
--- a/core/browser.py
+++ b/core/browser.py
@@ -73,6 +73,9 @@ class BrowserView(QWebEngineView):
         with open(os.path.join(os.path.dirname(__file__), "js", "clear_focus.js"), "r") as f:
             self.clear_focus_js = f.read()
 
+        with open(os.path.join(os.path.dirname(__file__), "js", "select_input_text.js"), "r") as f:
+            self.select_input_text_js = f.read()
+
     def filter_url(self, url):
         parsed = urlparse(url)
         qd = parse_qs(parsed.query, keep_blank_values=True)
@@ -253,6 +256,14 @@ class BrowserView(QWebEngineView):
     def redo_action(self):
         self.triggerPageAction(self.web_page.Redo)
 
+    def select_all(self):
+        # We need window focus before select all text.
+        self.web_page.executeJavaScript("window.focus()")
+        self.triggerPageAction(self.web_page.SelectAll)
+
+    def select_input_text(self):
+        self.web_page.executeJavaScript(self.select_input_text_js)
+
     def get_url(self):
         return self.web_page.executeJavaScript("window.location.href;")
 
@@ -670,5 +681,11 @@ class BrowserBuffer(Buffer):
         else:
             self.goto_right_tab.emit()
 
+    def select_all_or_input_text(self):
+        if self.is_focus():
+            self.buffer_widget.select_input_text()
+        else:
+            self.buffer_widget.select_all()
+
     def clear_focus(self):
         self.buffer_widget.clear_focus()
diff --git a/core/js/select_input_text.js b/core/js/select_input_text.js
new file mode 100644
index 0000000..5ba29ec
--- /dev/null
+++ b/core/js/select_input_text.js
@@ -0,0 +1,5 @@
+(function() {
+    const activeElement = document.activeElement;
+    activeElement.focus();
+    activeElement.select();
+})();
diff --git a/eaf.el b/eaf.el
index d64f821..e8e5a6a 100644
--- a/eaf.el
+++ b/eaf.el
@@ -256,6 +256,7 @@ Try not to modify this alist directly.  Use `eaf-setq' to modify instead."
     ("g" . "insert_or_scroll_to_begin")
     ("x" . "insert_or_close_buffer")
     ("G" . "insert_or_scroll_to_bottom")
+    ("C-a" . "select_all_or_input_text")
     ("M-u" . "clear_focus")
     ("<f5>" . "refresh_page"))
   "The keybinding of EAF Browser."