diff --git a/packages/super-editor/src/components/toolbar/LinkInput.test.js b/packages/super-editor/src/components/toolbar/LinkInput.test.js
index 8196b1b569..ae377b4c28 100644
--- a/packages/super-editor/src/components/toolbar/LinkInput.test.js
+++ b/packages/super-editor/src/components/toolbar/LinkInput.test.js
@@ -843,4 +843,90 @@ describe('LinkInput - getLinkHrefAtSelection type safety and boundary checking',
       expect(mockClosePopover).not.toHaveBeenCalled();
     });
   });
+
+  describe('URL normalization', () => {
+    it('defaults bare domains to https when submitting a new link', async () => {
+      const mockEditor = createMockEditor();
+      mockEditor.options = { documentMode: 'editing' };
+
+      const wrapper = mount(LinkInput, {
+        props: {
+          editor: mockEditor,
+          closePopover: mockClosePopover,
+          showInput: true,
+        },
+      });
+
+      await nextTick();
+      await nextTick();
+
+      await wrapper.find('input[name="link"]').setValue('example.com');
+      await nextTick();
+
+      wrapper.vm.handleSubmit();
+
+      expect(mockEditor.commands.toggleLink).toHaveBeenCalledWith(
+        expect.objectContaining({ href: 'https://example.com' }),
+      );
+    });
+
+    it('preserves explicit http links when submitting an existing link', async () => {
+      const mockEditor = createMockEditor();
+      mockEditor.options = { documentMode: 'editing' };
+      const linkMark = mockEditor.state.schema.marks.link;
+      mockEditor.state.selection.$from.nodeAfter = {
+        marks: [{ type: linkMark, attrs: { href: 'http://example.com' } }],
+      };
+
+      const wrapper = mount(LinkInput, {
+        props: {
+          editor: mockEditor,
+          closePopover: mockClosePopover,
+          showInput: true,
+        },
+      });
+
+      await nextTick();
+      await nextTick();
+
+      wrapper.vm.handleSubmit();
+
+      expect(mockEditor.commands.toggleLink).toHaveBeenCalledWith(
+        expect.objectContaining({ href: 'http://example.com' }),
+      );
+    });
+
+    it('blocks unsafe schemes in both submit and open-link flows', async () => {
+      const mockEditor = createMockEditor();
+      mockEditor.options = { documentMode: 'editing' };
+      const openSpy = vi.spyOn(window, 'open').mockImplementation(() => null);
+
+      const wrapper = mount(LinkInput, {
+        props: {
+          editor: mockEditor,
+          closePopover: mockClosePopover,
+          showInput: true,
+        },
+      });
+
+      await nextTick();
+      await nextTick();
+
+      await wrapper.find('input[name="link"]').setValue('javascript:foo.bar()');
+      await nextTick();
+
+      const openLinkBtn = wrapper.find('.open-link-icon');
+      expect(openLinkBtn.classes()).toContain('disabled');
+
+      wrapper.vm.handleSubmit();
+      await openLinkBtn.trigger('click');
+
+      expect(wrapper.vm.urlError).toBe(true);
+      expect(mockEditor.commands.toggleLink).not.toHaveBeenCalled();
+      expect(mockClosePopover).not.toHaveBeenCalled();
+      expect(openSpy).not.toHaveBeenCalled();
+
+      openSpy.mockRestore();
+    });
+  });
 });
diff --git a/packages/super-editor/src/components/toolbar/LinkInput.vue b/packages/super-editor/src/components/toolbar/LinkInput.vue
index b375027067..933bb080fe 100644
--- a/packages/super-editor/src/components/toolbar/LinkInput.vue
+++ b/packages/super-editor/src/components/toolbar/LinkInput.vue
@@ -1,5 +1,6 @@
 <script setup>
 import { ref, computed, watch, onMounted } from 'vue';
+import { sanitizeHref } from '@superdoc/url-validation';
 import { toolbarIcons } from './toolbarIcons.js';
 import { useHighContrastMode } from '../../composables/use-high-contrast-mode';
 import { TextSelection } from 'prosemirror-state';
@@ -118,21 +119,22 @@ const text = ref('');
 const rawUrl = ref('');
 const isAnchor = ref(false);
 
-// Prepend http if missing
+const HAS_PROTOCOL = /^[a-z][a-z0-9+.-]*:/i;
+
+// Default to https:// when no scheme is specified. Validation stays centralized in sanitizeHref.
 const url = computed(() => {
   if (!rawUrl.value) return '';
-  if (!rawUrl.value.startsWith('http') && !rawUrl.value.startsWith('#')) return 'http://' + rawUrl.value;
-  return rawUrl.value;
+  if (rawUrl.value.startsWith('#') || HAS_PROTOCOL.test(rawUrl.value)) return rawUrl.value;
+  return 'https://' + rawUrl.value;
 });
 
-const validUrl = computed(() => {
-  // anchors (starting with #) are always considered valid
-  if (url.value.startsWith('#')) return true;
-
-  const urlSplit = url.value.split('.').filter(Boolean);
-  return url.value.includes('.') && urlSplit.length > 1;
+const sanitizedUrl = computed(() => {
+  if (!url.value) return null;
+  return sanitizeHref(url.value);
 });
 
+const validUrl = computed(() => sanitizedUrl.value !== null);
+
 // --- CASE LOGIC ---
 const isEditing = computed(() => !isAnchor.value && !!getLinkHrefAtSelection());
 
@@ -141,7 +143,9 @@ const isDisabled = computed(() => !validUrl.value);
 const isViewingMode = computed(() => props.editor?.options?.documentMode === 'viewing');
 
 const openLink = () => {
-  window.open(url.value, '_blank');
+  const href = sanitizedUrl.value?.href;
+  if (!href) return;
+  window.open(href, '_blank');
 };
 
 const updateFromEditor = () => {
@@ -189,10 +193,16 @@ const handleSubmit = () => {
     return;
   }
 
-  const finalText = text.value || url.value;
+  const href = sanitizedUrl.value?.href;
+  if (!href) {
+    urlError.value = true;
+    return;
+  }
+
+  const finalText = text.value || href;
 
   if (editor.commands?.toggleLink) {
-    editor.commands.toggleLink({ href: url.value, text: finalText });
+    editor.commands.toggleLink({ href, text: finalText });
   }
 
   // Move cursor to end of link and refocus editor.