diff --git a/kvmd/apps/vnc/rfb/__init__.py b/kvmd/apps/vnc/rfb/__init__.py
index 83270cb9..2b8ed499 100644
--- a/kvmd/apps/vnc/rfb/__init__.py
+++ b/kvmd/apps/vnc/rfb/__init__.py
@@ -590,8 +590,8 @@ class RfbClient(RfbClientStream):  # pylint: disable=too-many-instance-attribute
         move = (self._width, self._height, to_x, to_y)
         if self.__mouse_move != move:
             await self._on_mouse_move_event(
-                tools.remap(to_x, 0, self._width, *MouseRange.RANGE),
-                tools.remap(to_y, 0, self._height, *MouseRange.RANGE),
+                tools.remap(to_x, 0, self._width - 1, *MouseRange.RANGE),
+                tools.remap(to_y, 0, self._height - 1, *MouseRange.RANGE),
             )
             self.__mouse_move = move
 
diff --git a/kvmd/tools.py b/kvmd/tools.py
index 8f82fbe5..b38ce6c6 100644
--- a/kvmd/tools.py
+++ b/kvmd/tools.py
@@ -33,7 +33,8 @@ from typing import TypeVar
 
 # =====
 def remap(value: int, in_min: int, in_max: int, out_min: int, out_max: int) -> int:
-    return int((value - in_min) * (out_max - out_min) // (in_max - in_min) + out_min)
+    result = int((value - in_min) * (out_max - out_min) // ((in_max - in_min) or 1) + out_min)
+    return min(max(result, out_min), out_max)
 
 
 # =====
diff --git a/web/share/js/kvm/mouse.js b/web/share/js/kvm/mouse.js
index f246c3f1..b19fbfd1 100644
--- a/web/share/js/kvm/mouse.js
+++ b/web/share/js/kvm/mouse.js
@@ -380,8 +380,8 @@ export function Mouse(__getGeometry, __recordWsEvent) {
 			if (pos !== null && (pos.x !== __sent_pos.x || pos.y !== __sent_pos.y)) {
 				let geo = __getGeometry();
 				let to = {
-					"x": tools.remap(pos.x, geo.x, geo.width, -32768, 32767),
-					"y": tools.remap(pos.y, geo.y, geo.height, -32768, 32767),
+					"x": tools.remap(pos.x - geo.x, 0, geo.width - 1, -32768, 32767),
+					"y": tools.remap(pos.y - geo.y, 0, geo.height - 1, -32768, 32767),
 				};
 				tools.debug("Mouse: moved:", to);
 				__sendEvent("mouse_move", {"to": to});
diff --git a/web/share/js/kvm/ocr.js b/web/share/js/kvm/ocr.js
index a3dbc492..398b721d 100644
--- a/web/share/js/kvm/ocr.js
+++ b/web/share/js/kvm/ocr.js
@@ -137,10 +137,10 @@ export function Ocr(__getGeometry) {
 			let rel_bottom = Math.max(__start_pos.y, __end_pos.y) - rect.top + offset;
 			let geo = __getGeometry();
 			__sel = {
-				"left": tools.remap(rel_left, geo.x, geo.width, 0, geo.real_width),
-				"right": tools.remap(rel_right, geo.x, geo.width, 0, geo.real_width),
-				"top": tools.remap(rel_top, geo.y, geo.height, 0, geo.real_height),
-				"bottom": tools.remap(rel_bottom, geo.y, geo.height, 0, geo.real_height),
+				"left": tools.remap(rel_left - geo.x, 0, geo.width, 0, geo.real_width),
+				"right": tools.remap(rel_right - geo.x, 0, geo.width, 0, geo.real_width),
+				"top": tools.remap(rel_top - geo.y, 0, geo.height, 0, geo.real_height),
+				"bottom": tools.remap(rel_bottom - geo.y, 0, geo.height, 0, geo.real_height),
 			};
 		} else {
 			__sel = null;
diff --git a/web/share/js/tools.js b/web/share/js/tools.js
index 4965a693..efe33a2f 100644
--- a/web/share/js/tools.js
+++ b/web/share/js/tools.js
@@ -136,14 +136,9 @@ export var tools = new function() {
 		return `${hours}:${mins}:${secs}.${millis}`;
 	};
 
-	self.remap = function(x, a1, b1, a2, b2) {
-		let remapped = Math.round((x - a1) / b1 * (b2 - a2) + a2);
-		if (remapped < a2) {
-			return a2;
-		} else if (remapped > b2) {
-			return b2;
-		}
-		return remapped;
+	self.remap = function(value, in_min, in_max, out_min, out_max) {
+		let result = Math.round((value - in_min) * (out_max - out_min) / ((in_max - in_min) || 1) + out_min);
+		return Math.min(Math.max(result, out_min), out_max);
 	};
 
 	self.getRandomInt = function(min, max) {