diff --git a/apps/desktop/src/components/connection/ConnectionDialog.vue b/apps/desktop/src/components/connection/ConnectionDialog.vue
index dc37a1c87..9e890b006 100644
--- a/apps/desktop/src/components/connection/ConnectionDialog.vue
+++ b/apps/desktop/src/components/connection/ConnectionDialog.vue
@@ -592,6 +592,8 @@ watch(customDriverName, (value) => {
 });
 
 async function testConnection() {
+  if (!ensureConnectionHostResolvedFromUrl()) return;
+
   const runId = ++testRunId;
   isTesting.value = true;
   testResult.value = null;
@@ -610,6 +612,31 @@ async function testConnection() {
   }
 }
 
+function applyConnectionUrlToForm(input: string): boolean {
+  try {
+    const parsed = parseConnectionUrl(input, selectedType.value);
+    form.value = applyParsedConnectionUrl(form.value, parsed);
+    selectedType.value = parsed.driverProfile;
+    customDriverName.value = isCustomCompatibleProfile() ? parsed.driverLabel : "";
+    mongoUseUrl.value = !!parsed.useMongoUrl;
+    if (!form.value.name.trim()) {
+      form.value.name = parsed.database || parsed.host || parsed.driverLabel;
+    }
+    resetTestState();
+    return true;
+  } catch (e: any) {
+    toast(t("connection.parseConnectionUrlFailed", { message: e?.message || String(e) }), 5000);
+    return false;
+  }
+}
+
+function ensureConnectionHostResolvedFromUrl(): boolean {
+  if (form.value.host.trim()) return true;
+  const url = connectionUrlInput.value.trim();
+  if (!url) return true;
+  return applyConnectionUrlToForm(url);
+}
+
 function generateConnectionName(): string {
   const label = selectedProfile().label;
   const rand = Math.random().toString(36).slice(2, 6);
@@ -654,19 +681,8 @@ function resetTestState() {
 }
 
 function applyConnectionUrl() {
-  try {
-    const parsed = parseConnectionUrl(connectionUrlInput.value, selectedType.value);
-    form.value = applyParsedConnectionUrl(form.value, parsed);
-    selectedType.value = parsed.driverProfile;
-    customDriverName.value = isCustomCompatibleProfile() ? parsed.driverLabel : "";
-    mongoUseUrl.value = !!parsed.useMongoUrl;
-    if (!form.value.name.trim()) {
-      form.value.name = parsed.database || parsed.host || parsed.driverLabel;
-    }
-    resetTestState();
+  if (applyConnectionUrlToForm(connectionUrlInput.value)) {
     toast(t("connection.parseConnectionUrlApplied"), 2000);
-  } catch (e: any) {
-    toast(t("connection.parseConnectionUrlFailed", { message: e?.message || String(e) }), 5000);
   }
 }
 
@@ -794,6 +810,7 @@ watch(canUseProxy, (value) => {
 });
 
 async function save() {
+  if (!ensureConnectionHostResolvedFromUrl()) return;
   if (isSaving.value) return;
   isSaving.value = true;
   resetTestState();
@@ -1723,7 +1740,8 @@ function openExternalUrl(url: string) {
               isSaving ||
               (!form.host &&
                 !(mongoUseUrl && form.connection_string) &&
-                !(form.db_type === 'jdbc' && form.connection_string))
+                !(form.db_type === 'jdbc' && form.connection_string) &&
+                !connectionUrlInput.trim())
             "
           >
             {{
diff --git a/packages/app-tests/connectionDialogUrlAutofill.test.ts b/packages/app-tests/connectionDialogUrlAutofill.test.ts
new file mode 100644
index 000000000..26b967563
--- /dev/null
+++ b/packages/app-tests/connectionDialogUrlAutofill.test.ts
@@ -0,0 +1,15 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { readFileSync } from "node:fs";
+
+const source = readFileSync("apps/desktop/src/components/connection/ConnectionDialog.vue", "utf8");
+
+test("connection dialog auto-resolves host from URL before test/save", () => {
+  assert.match(source, /function ensureConnectionHostResolvedFromUrl\(\): boolean/);
+  assert.match(source, /if \(!ensureConnectionHostResolvedFromUrl\(\)\) return;/);
+  assert.match(source, /return applyConnectionUrlToForm\(url\);/);
+});
+
+test("save button allows URL-only submissions when host is empty", () => {
+  assert.match(source, /&&\s*!connectionUrlInput\.trim\(\)\)/);
+});