diff --git a/wled00/data/404.htm b/wled00/data/404.htm
index ff41fa6e03..caf6856def 100644
--- a/wled00/data/404.htm
+++ b/wled00/data/404.htm
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
 	<head>
 		<meta charset="utf-8">
 		<meta content='width=device-width' name='viewport'>
diff --git a/wled00/data/cpal/cpal.htm b/wled00/data/cpal/cpal.htm
index 144a0b5edf..26d893bcdf 100644
--- a/wled00/data/cpal/cpal.htm
+++ b/wled00/data/cpal/cpal.htm
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
 <head>
 	<meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1">
 	<title>WLED Palette Editor</title>
diff --git a/wled00/data/dmxmap.htm b/wled00/data/dmxmap.htm
index 25953b0e37..2b821c1e77 100644
--- a/wled00/data/dmxmap.htm
+++ b/wled00/data/dmxmap.htm
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html><head><meta content='width=device-width' name='viewport'>
+<html lang="en"><head><meta content='width=device-width' name='viewport'>
 <title>DMX Map</title>
 <script>function B(){window.history.back()};function RS(){window.location = "/settings";}function RP(){top.location.href="/";}function FM() {
   var dmxlabels = ["SET 0","RED","GREEN","BLUE","WHITE","SHUTTER","SET 255", "DISABLED"];
diff --git a/wled00/data/icons-ui/demo.html b/wled00/data/icons-ui/demo.html
index 0416231fb0..bf5d4eebad 100644
--- a/wled00/data/icons-ui/demo.html
+++ b/wled00/data/icons-ui/demo.html
@@ -1,5 +1,5 @@
 <!doctype html>
-<html>
+<html lang="en">
 <head>
     <meta charset="utf-8">
     <title>IcoMoon Demo</title>
diff --git a/wled00/data/liveview.htm b/wled00/data/liveview.htm
index 69cc20c543..6515f5d56a 100644
--- a/wled00/data/liveview.htm
+++ b/wled00/data/liveview.htm
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
 <head>
   <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1">
   <meta charset="utf-8">
diff --git a/wled00/data/liveviewws2D.htm b/wled00/data/liveviewws2D.htm
index 91f63739cf..2b66b47724 100644
--- a/wled00/data/liveviewws2D.htm
+++ b/wled00/data/liveviewws2D.htm
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
 <head>
 	<meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1">
 	<meta charset="utf-8">
diff --git a/wled00/data/msg.htm b/wled00/data/msg.htm
index 2bb7e8825b..4bd58919a5 100644
--- a/wled00/data/msg.htm
+++ b/wled00/data/msg.htm
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
 
 <head>
 	<meta content='width=device-width' name='viewport'>
diff --git a/wled00/data/pixart/pixart.htm b/wled00/data/pixart/pixart.htm
index c67ac46a55..8c0e9773d8 100644
--- a/wled00/data/pixart/pixart.htm
+++ b/wled00/data/pixart/pixart.htm
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
   <head>
     <meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate">
     <meta http-equiv="Pragma" content="no-cache">
diff --git a/wled00/data/update.htm b/wled00/data/update.htm
index e93a113fae..305eaacadb 100644
--- a/wled00/data/update.htm
+++ b/wled00/data/update.htm
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
 <head>
 	<meta content='width=device-width' name='viewport'>
 	<title>WLED Update</title>
diff --git a/wled00/data/usermod.htm b/wled00/data/usermod.htm
index 3f7734a724..53aca464cb 100644
--- a/wled00/data/usermod.htm
+++ b/wled00/data/usermod.htm
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
 
 <body>No usermod custom web page set.</body>
 
diff --git a/wled00/data/welcome.htm b/wled00/data/welcome.htm
index 235440062e..3c9f0a74e0 100644
--- a/wled00/data/welcome.htm
+++ b/wled00/data/welcome.htm
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
 	<head>
 		<meta charset="utf-8">
 		<meta content='width=device-width' name='viewport'>
