diff --git a/glfw/cocoa_monitor.m b/glfw/cocoa_monitor.m
index 21ec8785f..d9fecbfc3 100644
--- a/glfw/cocoa_monitor.m
+++ b/glfw/cocoa_monitor.m
@@ -477,7 +477,7 @@ void _glfwPlatformGetMonitorWorkarea(_GLFWmonitor* monitor, int* xpos, int* ypos
     if (xpos)
         *xpos = frameRect.origin.x;
     if (ypos)
-        *ypos = _glfwTransformYNS(frameRect.origin.y + frameRect.size.height);
+        *ypos = _glfwTransformYNS(frameRect.origin.y + frameRect.size.height - 1);
     if (width)
         *width = frameRect.size.width;
     if (height)
diff --git a/glfw/cocoa_window.m b/glfw/cocoa_window.m
index 9913d8e9b..6aa8e9ad9 100644
--- a/glfw/cocoa_window.m
+++ b/glfw/cocoa_window.m
@@ -133,7 +133,7 @@ static void acquireMonitor(_GLFWwindow* window)
     _glfwSetVideoModeNS(window->monitor, &window->videoMode);
     const CGRect bounds = CGDisplayBounds(window->monitor->ns.displayID);
     const NSRect frame = NSMakeRect(bounds.origin.x,
-                                    _glfwTransformYNS(bounds.origin.y + bounds.size.height),
+                                    _glfwTransformYNS(bounds.origin.y + bounds.size.height - 1),
                                     bounds.size.width,
                                     bounds.size.height);
 
@@ -655,6 +655,7 @@ static GLFWapplicationshouldhandlereopenfun handle_reopen_callback = NULL;
     else
     {
         const NSRect contentRect = [window->ns.view frame];
+        // NOTE: The returned location uses base 0,1 not 0,0
         const NSPoint pos = [event locationInWindow];
 
         _glfwInputCursorPos(window, pos.x, contentRect.size.height - pos.y - 1);
@@ -935,9 +936,9 @@ is_ascii_control_char(char x) {
 - (BOOL)performDragOperation:(id <NSDraggingInfo>)sender
 {
     const NSRect contentRect = [window->ns.view frame];
-    _glfwInputCursorPos(window,
-                        [sender draggingLocation].x,
-                        contentRect.size.height - [sender draggingLocation].y);
+    // NOTE: The returned location uses base 0,1 not 0,0
+    const NSPoint pos = [sender draggingLocation];
+    _glfwInputCursorPos(window, pos.x, contentRect.size.height - pos.y);
     NSPasteboard* pasteboard = [sender draggingPasteboard];
     NSDictionary* options = @{NSPasteboardURLReadingFileURLsOnlyKey:@YES};
     NSArray* urls = [pasteboard readObjectsForClasses:@[[NSURL class]]
@@ -1015,10 +1016,8 @@ is_ascii_control_char(char x) {
 - (NSRect)firstRectForCharacterRange:(NSRange)range
                          actualRange:(NSRangePointer)actualRange
 {
-    int xpos, ypos;
-    _glfwPlatformGetWindowPos(window, &xpos, &ypos);
-    const NSRect contentRect = [window->ns.view frame];
-    return NSMakeRect(xpos, _glfwTransformYNS(ypos + contentRect.size.height), 0.0, 0.0);
+    const NSRect frame = [window->ns.view frame];
+    return NSMakeRect(frame.origin.x, frame.origin.y, 0.0, 0.0);
 }
 
 - (void)insertText:(id)string replacementRange:(NSRange)replacementRange
@@ -1416,13 +1415,13 @@ void _glfwPlatformGetWindowPos(_GLFWwindow* window, int* xpos, int* ypos)
     if (xpos)
         *xpos = contentRect.origin.x;
     if (ypos)
-        *ypos = _glfwTransformYNS(contentRect.origin.y + contentRect.size.height);
+        *ypos = _glfwTransformYNS(contentRect.origin.y + contentRect.size.height - 1);
 }
 
 void _glfwPlatformSetWindowPos(_GLFWwindow* window, int x, int y)
 {
     const NSRect contentRect = [window->ns.view frame];
-    const NSRect dummyRect = NSMakeRect(x, _glfwTransformYNS(y + contentRect.size.height), 0, 0);
+    const NSRect dummyRect = NSMakeRect(x, _glfwTransformYNS(y + contentRect.size.height - 1), 0, 0);
     const NSRect frameRect = [window->ns.object frameRectForContentRect:dummyRect];
     [window->ns.object setFrameOrigin:frameRect.origin];
 }
@@ -1585,7 +1584,7 @@ void _glfwPlatformSetWindowMonitor(_GLFWwindow* window,
         else
         {
             const NSRect contentRect =
-                NSMakeRect(xpos, _glfwTransformYNS(ypos + height), width, height);
+                NSMakeRect(xpos, _glfwTransformYNS(ypos + height - 1), width, height);
             const NSRect frameRect =
                 [window->ns.object frameRectForContentRect:contentRect
                                                  styleMask:getStyleMask(window)];
@@ -1615,7 +1614,7 @@ void _glfwPlatformSetWindowMonitor(_GLFWwindow* window,
     }
     else
     {
-        NSRect contentRect = NSMakeRect(xpos, _glfwTransformYNS(ypos + height),
+        NSRect contentRect = NSMakeRect(xpos, _glfwTransformYNS(ypos + height - 1),
                                         width, height);
         NSRect frameRect = [window->ns.object frameRectForContentRect:contentRect
                                                             styleMask:styleMask];
@@ -1796,12 +1795,13 @@ void _glfwPlatformPostEmptyEvent(void)
 void _glfwPlatformGetCursorPos(_GLFWwindow* window, double* xpos, double* ypos)
 {
     const NSRect contentRect = [window->ns.view frame];
+    // NOTE: The returned location uses base 0,1 not 0,0
     const NSPoint pos = [window->ns.object mouseLocationOutsideOfEventStream];
 
     if (xpos)
         *xpos = pos.x;
     if (ypos)
-        *ypos = contentRect.size.height - pos.y - 1;
+        *ypos = contentRect.size.height - pos.y;
 }
 
 void _glfwPlatformSetCursorPos(_GLFWwindow* window, double x, double y)
@@ -1809,6 +1809,7 @@ void _glfwPlatformSetCursorPos(_GLFWwindow* window, double x, double y)
     updateCursorImage(window);
 
     const NSRect contentRect = [window->ns.view frame];
+    // NOTE: The returned location uses base 0,1 not 0,0
     const NSPoint pos = [window->ns.object mouseLocationOutsideOfEventStream];
 
     window->ns.cursorWarpDeltaX += x - pos.x;
@@ -2203,5 +2204,5 @@ GLFWAPI void glfwGetCocoaKeyEquivalent(int glfw_key, int glfw_mods, unsigned sho
 //
 float _glfwTransformYNS(float y)
 {
-    return CGDisplayBounds(CGMainDisplayID()).size.height - y;
+    return CGDisplayBounds(CGMainDisplayID()).size.height - y - 1;
 }