diff --git a/web/app/src/pages/WorkspacePage/components/ProfilePreviewPopover/ProfilePreviewPopover.tsx b/web/app/src/pages/WorkspacePage/components/ProfilePreviewPopover/ProfilePreviewPopover.tsx
index efea21dd..1e8ef624 100644
--- a/web/app/src/pages/WorkspacePage/components/ProfilePreviewPopover/ProfilePreviewPopover.tsx
+++ b/web/app/src/pages/WorkspacePage/components/ProfilePreviewPopover/ProfilePreviewPopover.tsx
@@ -5,6 +5,7 @@ import { ProfilePreviewContent, type ProfilePreviewAnchorRect } from "@/componen
 import { IconButton } from "@/components/ui";
 import type { AgentLike } from "@/models/agents";
 import type { IMUser, TranslateFn } from "@/models/conversations";
+import { rootZoomScale } from "@/shared/lib/appScale";
 
 export type ProfilePreviewPopoverProps = {
   agent: AgentLike | null;
@@ -23,11 +24,6 @@ function clamp(value: number, min: number, max: number): number {
   return Math.min(max, Math.max(min, value));
 }
 
-function rootZoomScale(): number {
-  const zoom = Number.parseFloat(window.getComputedStyle(document.documentElement).zoom);
-  return Number.isFinite(zoom) && zoom > 0 ? zoom : 1;
-}
-
 function profilePreviewStyle(anchorRect: ProfilePreviewAnchorRect | null | undefined, cardHeight?: number | null) {
   const scale = rootZoomScale();
   const offset = 12;
diff --git a/web/app/src/pages/WorkspacePage/components/WorkspaceSidebar/WorkspacePrimaryNavigation.tsx b/web/app/src/pages/WorkspacePage/components/WorkspaceSidebar/WorkspacePrimaryNavigation.tsx
index d89fa9ca..a990e4b4 100644
--- a/web/app/src/pages/WorkspacePage/components/WorkspaceSidebar/WorkspacePrimaryNavigation.tsx
+++ b/web/app/src/pages/WorkspacePage/components/WorkspaceSidebar/WorkspacePrimaryNavigation.tsx
@@ -1,4 +1,5 @@
 import { classNames } from "@/shared/lib/classNames";
+import { rootZoomScale } from "@/shared/lib/appScale";
 import styles from "./WorkspaceSidebar.module.css";
 import { useCallback, useId, useRef, useState } from "react";
 import type { CSSProperties, ReactNode } from "react";
@@ -71,9 +72,10 @@ function PrimaryNavigationButton({
       return;
     }
     const rect = buttonRef.current.getBoundingClientRect();
+    const scale = rootZoomScale();
     setTooltipStyle({
-      left: rect.right + 10,
-      top: rect.top + rect.height / 2,
+      left: (rect.right + 10) / scale,
+      top: (rect.top + rect.height / 2) / scale,
     });
   }, [collapsed]);
 
diff --git a/web/app/src/shared/lib/appScale.ts b/web/app/src/shared/lib/appScale.ts
new file mode 100644
index 00000000..5b994cab
--- /dev/null
+++ b/web/app/src/shared/lib/appScale.ts
@@ -0,0 +1,4 @@
+export function rootZoomScale(): number {
+  const zoom = Number.parseFloat(window.getComputedStyle(document.documentElement).zoom);
+  return Number.isFinite(zoom) && zoom > 0 ? zoom : 1;
+}
diff --git a/web/app/tests/components/WorkspaceSidebar.test.tsx b/web/app/tests/components/WorkspaceSidebar.test.tsx
index d40c54cf..9c4834aa 100644
--- a/web/app/tests/components/WorkspaceSidebar.test.tsx
+++ b/web/app/tests/components/WorkspaceSidebar.test.tsx
@@ -314,6 +314,42 @@ describe("WorkspaceSidebar", () => {
     expect(contextAside).not.toHaveAttribute("inert");
   });
 
+  it("aligns collapsed navigation tooltips with their buttons when the page is zoomed", () => {
+    const previousZoom = document.documentElement.style.zoom;
+    document.documentElement.style.zoom = "0.8";
+    const view = renderSidebar({ isSidebarCollapsed: true });
+    const button = screen.getByRole("button", { name: "Model Providers" });
+    const buttonRect = {
+      bottom: 328,
+      height: 48,
+      left: 16,
+      right: 64,
+      top: 280,
+      width: 48,
+      x: 16,
+      y: 280,
+      toJSON: () => ({}),
+    };
+    const rectSpy = vi.spyOn(button, "getBoundingClientRect").mockReturnValue(buttonRect);
+
+    try {
+      fireEvent.mouseEnter(button);
+
+      const tooltip = screen.getByRole("tooltip");
+      const scale = 0.8;
+      const visualLeft = Number.parseFloat(tooltip.style.left) * scale;
+      const visualTop = Number.parseFloat(tooltip.style.top) * scale;
+
+      expect(visualLeft).toBe(buttonRect.right + 10);
+      expect(visualTop).toBe(buttonRect.top + buttonRect.height / 2);
+      expect(button).toHaveAttribute("aria-describedby", tooltip.id);
+    } finally {
+      rectSpy.mockRestore();
+      view.unmount();
+      document.documentElement.style.zoom = previousZoom;
+    }
+  });
+
   it("opens the scheduled task view from the task navigation", () => {
     const onSelectTask = vi.fn();
     const onSelectTaskBoardView = vi.fn();