diff --git a/code/__HELPERS/text.dm b/code/__HELPERS/text.dm
index ba465c32c1c..9c5eb58ebb0 100644
--- a/code/__HELPERS/text.dm
+++ b/code/__HELPERS/text.dm
@@ -989,3 +989,27 @@ GLOBAL_LIST_INIT(binary, list("0","1"))
 		return word + "ay"
 	//otherwise unmutated
 	return word
+	
+/**
+ * The procedure to check the text of the entered text on ntnrc_client.dm
+ *
+ * This procedure is designed to check the text you type into the chat client. 
+ * It checks for invalid characters and the size of the entered text. 
+ */
+/proc/reject_bad_chattext(text, max_length = 256)
+	var/non_whitespace = FALSE
+	var/char = ""
+	if (length(text) > max_length)
+		return
+	else
+		for(var/i = 1, i <= length(text), i += length(char))
+			char = text[i]
+			switch(text2ascii(char))
+				if(0 to 31)
+					return
+				if(32)
+					continue
+				else
+					non_whitespace = TRUE
+		if (non_whitespace)
+			return text
diff --git a/code/modules/modular_computers/file_system/programs/ntnrc_client.dm b/code/modules/modular_computers/file_system/programs/ntnrc_client.dm
index 29a4418d2ca..bd4c34bd341 100644
--- a/code/modules/modular_computers/file_system/programs/ntnrc_client.dm
+++ b/code/modules/modular_computers/file_system/programs/ntnrc_client.dm
@@ -1,3 +1,6 @@
+#define USERNAME_SIZE 32
+#define CHANNELNAME_SIZE 12
+#define MESSAGE_SIZE 2048
 
 /datum/computer_file/program/chatclient
 	filename = "ntnrc_client"
@@ -44,7 +47,7 @@
 		if("PRG_speak")
 			if(!channel || isnull(active_channel))
 				return
-			var/message = reject_bad_text(params["message"])
+			var/message = reject_bad_chattext(params["message"], MESSAGE_SIZE)
 			if(!message)
 				return
 			if(channel.password && (!(src in channel.active_clients) && !(src in channel.offline_clients)))
@@ -76,7 +79,7 @@
 				active_channel = null
 				return TRUE
 		if("PRG_newchannel")
-			var/channel_title = reject_bad_text(params["new_channel_name"])
+			var/channel_title = reject_bad_chattext(params["new_channel_name"], CHANNELNAME_SIZE)
 			if(!channel_title)
 				return
 			var/datum/ntnet_conversation/C = new /datum/ntnet_conversation()
@@ -99,7 +102,7 @@
 				netadmin_mode = TRUE
 				return TRUE
 		if("PRG_changename")
-			var/newname = sanitize(params["new_name"])
+			var/newname = reject_bad_chattext(params["new_name"], USERNAME_SIZE)
 			newname = replacetext(newname, " ", "_")
 			if(!newname || newname == username)
 				return
@@ -135,7 +138,7 @@
 		if("PRG_renamechannel")
 			if(!authed)
 				return
-			var/newname = reject_bad_text(params["new_name"])
+			var/newname = reject_bad_chattext(params["new_name"], CHANNELNAME_SIZE)
 			if(!newname || !channel)
 				return
 			channel.add_status_message("Channel renamed from [channel.title] to [newname] by operator.")
@@ -267,3 +270,7 @@
 		data["messages"] = list()
 
 	return data
+
+#undef USERNAME_SIZE
+#undef CHANNELNAME_SIZE
+#undef MESSAGE_SIZE