diff --git a/osu.Game.Tests/Visual/Online/TestSceneChatTextBox.cs b/osu.Game.Tests/Visual/Online/TestSceneChatTextBox.cs
index 1e80acd56b..8c5475223c 100644
--- a/osu.Game.Tests/Visual/Online/TestSceneChatTextBox.cs
+++ b/osu.Game.Tests/Visual/Online/TestSceneChatTextBox.cs
@@ -3,11 +3,13 @@
 
 #nullable disable
 
+using System.Linq;
 using NUnit.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
+using osu.Framework.Testing;
 using osu.Game.Graphics;
 using osu.Game.Graphics.Sprites;
 using osu.Game.Online.API.Requests.Responses;
@@ -18,7 +20,7 @@ using osu.Game.Overlays.Chat;
 namespace osu.Game.Tests.Visual.Online
 {
     [TestFixture]
-    public partial class TestSceneChatTextBox : OsuTestScene
+    public partial class TestSceneChatTextBox : OsuManualInputManagerTestScene
     {
         [Cached]
         private readonly OverlayColourProvider colourProvider = new OverlayColourProvider(OverlayColourScheme.Pink);
@@ -30,6 +32,8 @@ namespace osu.Game.Tests.Visual.Online
         private OsuSpriteText searchText;
         private ChatTextBar bar;
 
+        private ChatTextBox textBox => bar.ChildrenOfType<ChatTextBox>().Single();
+
         [SetUp]
         public void SetUp()
         {
@@ -115,6 +119,36 @@ namespace osu.Game.Tests.Visual.Online
             AddStep("Chat Mode Search", () => bar.ShowSearch.Value = true);
         }
 
+        [Test]
+        public void TestLengthLimit()
+        {
+            var firstChannel = new Channel
+            {
+                Name = "#test1",
+                Type = ChannelType.Public,
+                Id = 4567,
+                MessageLengthLimit = 20
+            };
+            var secondChannel = new Channel
+            {
+                Name = "#test2",
+                Type = ChannelType.Public,
+                Id = 5678,
+                MessageLengthLimit = 5
+            };
+
+            AddStep("switch to channel with 20 char length limit", () => currentChannel.Value = firstChannel);
+            AddStep("type a message", () => textBox.Current.Value = "abcdefgh");
+
+            AddStep("switch to channel with 5 char length limit", () => currentChannel.Value = secondChannel);
+            AddAssert("text box empty", () => textBox.Current.Value, () => Is.Empty);
+            AddStep("type too much", () => textBox.Current.Value = "123456");
+            AddAssert("text box has 5 chars", () => textBox.Current.Value, () => Has.Length.EqualTo(5));
+
+            AddStep("switch back to channel with 20 char length limit", () => currentChannel.Value = firstChannel);
+            AddAssert("unsent message preserved without truncation", () => textBox.Current.Value, () => Is.EqualTo("abcdefgh"));
+        }
+
         private static Channel createPublicChannel(string name)
             => new Channel { Name = name, Type = ChannelType.Public, Id = 1234 };
 
diff --git a/osu.Game/Online/Chat/Channel.cs b/osu.Game/Online/Chat/Channel.cs
index 761e8aba8d..15ce926039 100644
--- a/osu.Game/Online/Chat/Channel.cs
+++ b/osu.Game/Online/Chat/Channel.cs
@@ -12,6 +12,7 @@ using osu.Framework.Bindables;
 using osu.Framework.Lists;
 using osu.Game.Online.API.Requests.Responses;
 using osu.Game.Overlays.Chat;
+using osu.Game.Overlays.Chat.Listing;
 
 namespace osu.Game.Online.Chat
 {
@@ -86,6 +87,12 @@ namespace osu.Game.Online.Chat
         [JsonProperty(@"last_read_id")]
         public long? LastReadId;
 
+        /// <remarks>
+        /// Purposefully nullable for the sake of <see cref="ChannelListing.ChannelListingChannel"/>.
+        /// </remarks>
+        [JsonProperty(@"message_length_limit")]
+        public int? MessageLengthLimit;
+
         /// <summary>
         /// Signals if the current user joined this channel or not. Defaults to false.
         /// Note that this does not guarantee a join has completed. Check Id > 0 for confirmation.
diff --git a/osu.Game/Overlays/Chat/ChatTextBar.cs b/osu.Game/Overlays/Chat/ChatTextBar.cs
index 87e787fcb8..16a8d14b10 100644
--- a/osu.Game/Overlays/Chat/ChatTextBar.cs
+++ b/osu.Game/Overlays/Chat/ChatTextBar.cs
@@ -156,7 +156,11 @@ namespace osu.Game.Overlays.Chat
                     chatTextBox.Current.UnbindFrom(change.OldValue.TextBoxMessage);
 
                 if (newChannel != null)
+                {
+                    // change length limit first before binding to avoid accidentally truncating pending message from new channel.
+                    chatTextBox.LengthLimit = newChannel.MessageLengthLimit;
                     chatTextBox.Current.BindTo(newChannel.TextBoxMessage);
+                }
             }, true);
         }