diff --git a/tools/callstats.html b/tools/callstats.html
index 548a1e8d21..f9506868cf 100644
--- a/tools/callstats.html
+++ b/tools/callstats.html
@@ -4,8 +4,9 @@
 Copyright 2016 the V8 project authors. All rights reserved.  Use of this source
 code is governed by a BSD-style license that can be found in the LICENSE file.
 -->
-
 <head>
+<!-- This will be overwritten by the v8.dev/tools exporter -->
+<!-- ANALYTICS_PLACEHOLDER -->
   <meta charset="utf-8">
   <title>V8 Runtime Call Stats Komparator</title>
   <link rel="stylesheet" type="text/css" href="system-analyzer/index.css">
diff --git a/tools/heap-layout/index.html b/tools/heap-layout/index.html
index 0f33a73049..a78e0b8d18 100644
--- a/tools/heap-layout/index.html
+++ b/tools/heap-layout/index.html
@@ -2,10 +2,10 @@
 <!-- Copyright 2021 the V8 project authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file. -->
-
 <html lang="en">
-
 <head>
+  <!-- This will be overwritten by the v8.dev/tools exporter -->
+<!-- ANALYTICS_PLACEHOLDER -->
   <meta charset="UTF-8">
   <title>V8 Heap Layout</title>
 
@@ -69,4 +69,4 @@ found in the LICENSE file. -->
 
 </body>
 
-</html>
\ No newline at end of file
+</html>
diff --git a/tools/heap-stats/index.html b/tools/heap-stats/index.html
index 9f053a8730..ab43894c07 100644
--- a/tools/heap-stats/index.html
+++ b/tools/heap-stats/index.html
@@ -2,10 +2,10 @@
 <!-- Copyright 2018 the V8 project authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file. -->
-
 <html lang="en">
-
 <head>
+  <!-- This will be overwritten by the v8.dev/tools exporter -->
+<!-- ANALYTICS_PLACEHOLDER -->
   <meta charset="UTF-8">
   <title>V8 Heap Statistics</title>
   <link href='https://fonts.googleapis.com/css?family=Roboto' rel='stylesheet'>
diff --git a/tools/index.html b/tools/index.html
index dfb0be7b34..b7b3bd1843 100644
--- a/tools/index.html
+++ b/tools/index.html
@@ -2,10 +2,10 @@
 <!-- Copyright 2020 the V8 project authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file. -->
-
 <html lang="en">
-
 <head>
+  <!-- This will be overwritten by the v8.dev/tools exporter -->
+<!-- ANALYTICS_PLACEHOLDER -->
   <meta charset="UTF-8">
   <title>V8 Tools Landing Page</title>
 <style>
diff --git a/tools/parse-processor.html b/tools/parse-processor.html
index 495a21d655..8000223c7d 100644
--- a/tools/parse-processor.html
+++ b/tools/parse-processor.html
@@ -1,11 +1,12 @@
 <!DOCTYPE html>
-<html>
 <!--
 Copyright 2016 the V8 project authors. All rights reserved.  Use of this source
 code is governed by a BSD-style license that can be found in the LICENSE file.
 -->
-
+<html lang="en">
 <head>
+<!-- This will be overwritten by the v8.dev/tools exporter -->
+<!-- ANALYTICS_PLACEHOLDER -->
 <meta charset="utf-8">
 <title>V8 Parse Processor</title>
 <style>
diff --git a/tools/profview/index.html b/tools/profview/index.html
index 64f4e512c3..8ce28053ff 100644
--- a/tools/profview/index.html
+++ b/tools/profview/index.html
@@ -2,10 +2,10 @@
 <!-- Copyright 2017 the V8 project authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file. -->
-
 <html lang="en">
-
 <head>
+  <!-- This will be overwritten by the v8.dev/tools exporter -->
+<!-- ANALYTICS_PLACEHOLDER -->
   <meta charset="utf-8"/>
   <title>V8 Tick Processor</title>
   <link rel="stylesheet" href="profview.css">
diff --git a/tools/turbolizer/index.html b/tools/turbolizer/index.html
index 3bbdf8017c..673fb6eb86 100644
--- a/tools/turbolizer/index.html
+++ b/tools/turbolizer/index.html
@@ -1,10 +1,12 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
 <!--
 Copyright 2019 the V8 project authors. All rights reserved.  Use of this source
 code is governed by a BSD-style license that can be found in the LICENSE file.
 -->
 <head>
+  <!-- This will be overwritten by the v8.dev/tools exporter -->
+<!-- ANALYTICS_PLACEHOLDER -->
   <meta charset="utf-8">
   <title>V8 Turbolizer</title>
   <link rel="stylesheet" href="css/turbo-visualizer.css">
diff --git a/tools/zone-stats/index.html b/tools/zone-stats/index.html
index a7dfa2ddfd..0929f3a738 100644
--- a/tools/zone-stats/index.html
+++ b/tools/zone-stats/index.html
@@ -2,10 +2,10 @@
 <!-- Copyright 2020 the V8 project authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file. -->
-
 <html lang="en">
-
 <head>
+  <!-- This will be overwritten by the v8.dev/tools exporter -->
+<!-- ANALYTICS_PLACEHOLDER -->
   <meta charset="UTF-8">
   <title>V8 Zone Statistics</title>
   <link href='https://fonts.googleapis.com/css?family=Roboto' rel='stylesheet'>
