diff --git a/frontend/src/lib/report/report-pdf.tsx b/frontend/src/lib/report/report-pdf.tsx
index c08ef130..a7d57ea5 100644
--- a/frontend/src/lib/report/report-pdf.tsx
+++ b/frontend/src/lib/report/report-pdf.tsx
@@ -3,40 +3,63 @@ import { marked } from 'marked';
 
 import { Log } from '@/lib/log';
 
-// Register Noto Sans (covers Latin + Cyrillic + Greek + many other scripts)
-Font.register({
-    family: 'NotoSans',
-    fonts: [
-        { fontStyle: 'normal', fontWeight: 'normal', src: '/fonts/NotoSans-Regular.ttf' },
-        { fontStyle: 'normal', fontWeight: 'bold', src: '/fonts/NotoSans-Bold.ttf' },
-        { fontStyle: 'italic', fontWeight: 'normal', src: '/fonts/NotoSans-Italic.ttf' },
-        { fontStyle: 'italic', fontWeight: 'bold', src: '/fonts/NotoSans-BoldItalic.ttf' },
-    ],
-});
+const CJK_RE = /[\u4E00-\u9FFF\u3400-\u4DBF\uF900-\uFAFF\u3000-\u303F\uFF01-\uFF60\uFFE0-\uFFE6]+/gu;
+const HAS_CJK_RE = /[\u4E00-\u9FFF\u3400-\u4DBF\uF900-\uFAFF\u3000-\u303F\uFF01-\uFF60\uFFE0-\uFFE6]/u;
 
-// Register Noto Sans Mono (covers Latin + Cyrillic for code blocks)
-Font.register({
-    family: 'NotoSansMono',
-    fonts: [
-        { fontStyle: 'normal', fontWeight: 'normal', src: '/fonts/NotoSansMono-Regular.ttf' },
-        { fontStyle: 'normal', fontWeight: 'bold', src: '/fonts/NotoSansMono-Bold.ttf' },
-    ],
-});
+let hasBaseFonts = false;
+let hasCJKFonts = false;
 
-// Register Noto Sans SC (Simplified Chinese, covers CJK + Latin)
-Font.register({
-    family: 'NotoSansSC',
-    fonts: [
-        { fontStyle: 'normal', fontWeight: 'normal', src: '/fonts/NotoSansSC-Regular.otf' },
-        { fontStyle: 'normal', fontWeight: 'bold', src: '/fonts/NotoSansSC-Bold.otf' },
-    ],
-});
+const registerBaseFonts = (): void => {
+    if (hasBaseFonts) {
+        return;
+    }
 
-// Disable word hyphenation (breaks CJK and Cyrillic incorrectly)
-Font.registerHyphenationCallback((word) => [word]);
+    Font.register({
+        family: 'NotoSans',
+        fonts: [
+            { fontStyle: 'normal', fontWeight: 'normal', src: '/fonts/NotoSans-Regular.ttf' },
+            { fontStyle: 'normal', fontWeight: 'bold', src: '/fonts/NotoSans-Bold.ttf' },
+            { fontStyle: 'italic', fontWeight: 'normal', src: '/fonts/NotoSans-Italic.ttf' },
+            { fontStyle: 'italic', fontWeight: 'bold', src: '/fonts/NotoSans-BoldItalic.ttf' },
+        ],
+    });
 
-// Regex that matches any CJK unified ideographs or CJK punctuation/fullwidth chars
-const CJK_RE = /[\u4E00-\u9FFF\u3400-\u4DBF\uF900-\uFAFF\u3000-\u303F\uFF01-\uFF60\uFFE0-\uFFE6]+/g;
+    Font.register({
+        family: 'NotoSansMono',
+        fonts: [
+            { fontStyle: 'normal', fontWeight: 'normal', src: '/fonts/NotoSansMono-Regular.ttf' },
+            { fontStyle: 'normal', fontWeight: 'bold', src: '/fonts/NotoSansMono-Bold.ttf' },
+        ],
+    });
+
+    Font.registerHyphenationCallback((word) => [word]);
+
+    hasBaseFonts = true;
+};
+
+const registerCJKFonts = (): void => {
+    if (hasCJKFonts) {
+        return;
+    }
+
+    Font.register({
+        family: 'NotoSansSC',
+        fonts: [
+            { fontStyle: 'normal', fontWeight: 'normal', src: '/fonts/NotoSansSC-Regular.otf' },
+            { fontStyle: 'normal', fontWeight: 'bold', src: '/fonts/NotoSansSC-Bold.otf' },
+        ],
+    });
+
+    hasCJKFonts = true;
+};
+
+const ensureFonts = (content: string): void => {
+    registerBaseFonts();
+
+    if (HAS_CJK_RE.test(content)) {
+        registerCJKFonts();
+    }
+};
 
 interface TextSegment {
     isCJK: boolean;
@@ -610,6 +633,8 @@ function PDFReportDocument({ content }: { content: string }) {
 
 export const generatePDFFromMarkdownNew = async (content: string, fileName: string): Promise<void> => {
     try {
+        ensureFonts(content);
+
         const doc = <PDFReportDocument content={content} />;
         const blob = await pdf(doc).toBlob();
 
@@ -630,6 +655,8 @@ export const generatePDFFromMarkdownNew = async (content: string, fileName: stri
 
 export const generatePDFBlobNew = async (content: string): Promise<Blob> => {
     try {
+        ensureFonts(content);
+
         const doc = <PDFReportDocument content={content} />;
 
         return await pdf(doc).toBlob();