diff --git a/.jules/palette.md b/.jules/palette.md
index a1633627..820f33d1 100644
--- a/.jules/palette.md
+++ b/.jules/palette.md
@@ -1,3 +1,6 @@
 ## 2024-05-18 - Disabled and Loading States for Async Actions
 **Learning:** Adding explicit loading and disabled states to asynchronous action buttons (like "Refresh") provides immediate feedback, reducing user confusion and preventing double-submissions.
 **Action:** Always ensure that buttons triggering network requests visually indicate the loading state and are disabled until the request completes.
+## 2026-07-09 - 버튼 내 로딩 텍스트
+**Learning:** 비동기 작업 시 버튼 HTML을 임시로 로딩 텍스트로 교체하여 진행 상태를 시각적으로 보여주는 것은 사용자 경험(UX)을 크게 향상시킵니다.
+**Action:** 비동기 작업을 시작하기 전에 버튼의 원래 innerHTML을 저장하고, 진행 상태를 나타내도록 HTML을 업데이트한 뒤, finally 블록에서 원래 HTML로 복원합니다.
diff --git a/src/main/resources/static/assets/viewer/demo.js b/src/main/resources/static/assets/viewer/demo.js
index 84eb8f3a..d6c7d6c8 100644
--- a/src/main/resources/static/assets/viewer/demo.js
+++ b/src/main/resources/static/assets/viewer/demo.js
@@ -271,6 +271,8 @@ async function retryActiveJob() {
   const jobId = activeJobDetail.jobId;
   setStatus("Requesting operator retry...");
   el.retryJobBtn.disabled = true;
+  const originalRetryHtml = el.retryJobBtn.innerHTML;
+  el.retryJobBtn.innerHTML = "Requesting retry...";
   try {
     const res = await fetch(`/api/v1/convert/jobs/${encodeURIComponent(jobId)}/retry`, {
       method: "POST",
@@ -308,6 +310,7 @@ async function retryActiveJob() {
     setError("Network error while requesting retry. Retry when the service is reachable.");
   } finally {
     el.retryJobBtn.disabled = false;
+    el.retryJobBtn.innerHTML = originalRetryHtml;
   }
 }
 
@@ -437,6 +440,8 @@ async function submitDocument(event) {
 
   el.submitBtn.disabled = true;
   setStatus("Submitting document...");
+  const originalBtnHtml = el.submitBtn.innerHTML;
+  el.submitBtn.innerHTML = "Submitting...";
 
   try {
     const body = new FormData();
@@ -479,6 +484,7 @@ async function submitDocument(event) {
     setError("Network error while submitting. Retry when the service is reachable.");
   } finally {
     el.submitBtn.disabled = false;
+    el.submitBtn.innerHTML = originalBtnHtml;
   }
 }
 
diff --git a/src/test/java/com/clearfolio/viewer/controller/ViewerUiControllerTest.java b/src/test/java/com/clearfolio/viewer/controller/ViewerUiControllerTest.java
index dadb8949..c244b173 100644
--- a/src/test/java/com/clearfolio/viewer/controller/ViewerUiControllerTest.java
+++ b/src/test/java/com/clearfolio/viewer/controller/ViewerUiControllerTest.java
@@ -116,6 +116,7 @@ void demoScriptUsesExistingApiAndSessionHistory() throws Exception {
             assertTrue(script.contains("lastInspectedAt"));
             assertTrue(script.contains("openJobDetail"));
             assertTrue(script.contains("retryActiveJob"));
+            assertTrue(script.contains("innerHTML"));
             assertTrue(script.contains("/retry"));
             assertTrue(script.contains("X-Clearfolio-Operator-Id"));
             assertTrue(script.contains("X-Clearfolio-Tenant-Id"));