diff --git a/src/network/network_content_gui.cpp b/src/network/network_content_gui.cpp
index f82b807c62..3ef613824f 100644
--- a/src/network/network_content_gui.cpp
+++ b/src/network/network_content_gui.cpp
@@ -345,7 +345,7 @@ class NetworkContentListWindow : public Window, ContentCallback {
 	uint filesize_sum;           ///< The sum of all selected file sizes
 	Scrollbar *vscroll;          ///< Cache of the vertical scrollbar
 
-	static char content_type_strs[CONTENT_TYPE_END][64]; ///< Cached strings for all content types.
+	static std::string content_type_strs[CONTENT_TYPE_END]; ///< Cached strings for all content types.
 
 	/** Search external websites for content */
 	void OpenExternalSearch()
@@ -1019,7 +1019,7 @@ NetworkContentListWindow::GUIContentList::FilterFunction * const NetworkContentL
 	&TypeOrSelectedFilter,
 };
 
-char NetworkContentListWindow::content_type_strs[CONTENT_TYPE_END][64];
+std::string NetworkContentListWindow::content_type_strs[CONTENT_TYPE_END];
 
 /**
  * Build array of all strings corresponding to the content types.
@@ -1027,7 +1027,7 @@ char NetworkContentListWindow::content_type_strs[CONTENT_TYPE_END][64];
 void BuildContentTypeStringList()
 {
 	for (int i = CONTENT_TYPE_BEGIN; i < CONTENT_TYPE_END; i++) {
-		GetString(NetworkContentListWindow::content_type_strs[i], STR_CONTENT_TYPE_BASE_GRAPHICS + i - CONTENT_TYPE_BASE_GRAPHICS, lastof(NetworkContentListWindow::content_type_strs[i]));
+		NetworkContentListWindow::content_type_strs[i] = GetString(STR_CONTENT_TYPE_BASE_GRAPHICS + i - CONTENT_TYPE_BASE_GRAPHICS);
 	}
 }
 
diff --git a/src/newgrf_debug_gui.cpp b/src/newgrf_debug_gui.cpp
index bccae4f1bd..86f45bfd16 100644
--- a/src/newgrf_debug_gui.cpp
+++ b/src/newgrf_debug_gui.cpp
@@ -510,9 +510,7 @@ struct NewGRFInspectWindow : Window {
 						NOT_REACHED();
 				}
 
-				char buffer[64];
-				GetString(buffer, string, lastof(buffer));
-				this->DrawString(r, i++, fmt::format("  {:02x}: {} ({})", nip->prop, buffer, nip->name));
+				this->DrawString(r, i++, fmt::format("  {:02x}: {} ({})", nip->prop, GetString(string), nip->name));
 			}
 		}
 
diff --git a/src/newgrf_gui.cpp b/src/newgrf_gui.cpp
index 109a958016..cec827f300 100644
--- a/src/newgrf_gui.cpp
+++ b/src/newgrf_gui.cpp
@@ -71,14 +71,13 @@ static void ShowNewGRFInfo(const GRFConfig *c, const Rect &r, bool show_params)
 {
 	Rect tr = r.Shrink(WidgetDimensions::scaled.frametext);
 	if (c->error != nullptr) {
-		char message[512];
 		SetDParamStr(0, c->error->custom_message); // is skipped by built-in messages
 		SetDParamStr(1, c->filename);
 		SetDParamStr(2, c->error->data);
 		for (uint i = 0; i < c->error->param_value.size(); i++) {
 			SetDParam(3 + i, c->error->param_value[i]);
 		}
-		GetString(message, c->error->message != STR_NULL ? c->error->message : STR_JUST_RAW_STRING, lastof(message));
+		std::string message = GetString(c->error->message != STR_NULL ? c->error->message : STR_JUST_RAW_STRING);
 
 		SetDParamStr(0, message);
 		tr.top = DrawStringMultiLine(tr, c->error->severity);
diff --git a/src/osk_gui.cpp b/src/osk_gui.cpp
index 307cc4f793..3b8e963bb5 100644
--- a/src/osk_gui.cpp
+++ b/src/osk_gui.cpp
@@ -347,27 +347,18 @@ static WindowDesc _osk_desc(
  */
 void GetKeyboardLayout()
 {
-	char keyboard[2][OSK_KEYBOARD_ENTRIES * 4 + 1];
-	char errormark[2][OSK_KEYBOARD_ENTRIES + 1]; // used for marking invalid chars
+	std::string keyboard[2];
+	std::string errormark[2]; // used for marking invalid chars
 	bool has_error = false; // true when an invalid char is detected
 
-	if (_keyboard_opt[0].empty()) {
-		GetString(keyboard[0], STR_OSK_KEYBOARD_LAYOUT, lastof(keyboard[0]));
-	} else {
-		strecpy(keyboard[0], _keyboard_opt[0].c_str(), lastof(keyboard[0]));
-	}
-
-	if (_keyboard_opt[1].empty()) {
-		GetString(keyboard[1], STR_OSK_KEYBOARD_LAYOUT_CAPS, lastof(keyboard[1]));
-	} else {
-		strecpy(keyboard[1], _keyboard_opt[1].c_str(), lastof(keyboard[1]));
-	}
+	keyboard[0] = _keyboard_opt[0].empty() ? GetString(STR_OSK_KEYBOARD_LAYOUT) : _keyboard_opt[0];
+	keyboard[1] = _keyboard_opt[1].empty() ? GetString(STR_OSK_KEYBOARD_LAYOUT_CAPS) : _keyboard_opt[1];
 
 	for (uint j = 0; j < 2; j++) {
-		const char *kbd = keyboard[j];
+		auto kbd = keyboard[j].begin();
 		bool ended = false;
 		for (uint i = 0; i < OSK_KEYBOARD_ENTRIES; i++) {
-			_keyboard[j][i] = Utf8Consume(&kbd);
+			_keyboard[j][i] = Utf8Consume(kbd);
 
 			/* Be lenient when the last characters are missing (is quite normal) */
 			if (_keyboard[j][i] == '\0' || ended) {
@@ -377,10 +368,10 @@ void GetKeyboardLayout()
 			}
 
 			if (IsPrintable(_keyboard[j][i])) {
-				errormark[j][i] = ' ';
+				errormark[j] += ' ';
 			} else {
 				has_error = true;
-				errormark[j][i] = '^';
+				errormark[j] += '^';
 				_keyboard[j][i] = ' ';
 			}
 		}
diff --git a/src/saveload/saveload.cpp b/src/saveload/saveload.cpp
index abe61ac247..b2b626386f 100644
--- a/src/saveload/saveload.cpp
+++ b/src/saveload/saveload.cpp
@@ -2792,9 +2792,9 @@ const char *GetSaveLoadErrorString()
 	SetDParam(0, _sl.error_str);
 	SetDParamStr(1, _sl.extra_msg);
 
-	static char err_str[512];
-	GetString(err_str, _sl.action == SLA_SAVE ? STR_ERROR_GAME_SAVE_FAILED : STR_ERROR_GAME_LOAD_FAILED, lastof(err_str));
-	return err_str;
+	static std::string err_str;
+	err_str = GetString(_sl.action == SLA_SAVE ? STR_ERROR_GAME_SAVE_FAILED : STR_ERROR_GAME_LOAD_FAILED);
+	return err_str.c_str();
 }
 
 /** Show a gui message when saving has failed */