diff --git a/src/FormInputValues.ts b/src/FormInputValues.ts
index 3d0d347..6da7a2b 100644
--- a/src/FormInputValues.ts
+++ b/src/FormInputValues.ts
@@ -6,4 +6,14 @@ export class FormInputValues {
   public readonly optionNameToSelectedIndex: Map<string, number> = new Map();
   public readonly radioGroupNameToSelectedIndex: Map<string, number> =
     new Map();
+
+  public isEmpty(): boolean {
+    return (
+      this.textNameToValue.size == 0 &&
+      this.checkboxNameToValue.size == 0 &&
+      this.dropdownNameToSelectedIndex.size == 0 &&
+      this.optionNameToSelectedIndex.size == 0 &&
+      this.radioGroupNameToSelectedIndex.size == 0
+    );
+  }
 }
diff --git a/src/Main.ts b/src/Main.ts
index 53cf11f..5920eed 100644
--- a/src/Main.ts
+++ b/src/Main.ts
@@ -165,8 +165,9 @@ function onPageLoad() {
     view.setOnPdfFileChosenListener(
       function () {
         const overlays: Overlays = extractOverlays();
+        const formValues = view.extractFormInputValues();
         return (
-          overlays.pagesOverlays.size == 0 ||
+          (overlays.pagesOverlays.size == 0 && formValues.isEmpty()) ||
           confirm(
             "If you load another PDF, all changes in the current PDF will be lost. Are you sure?"
           )