diff --git a/src/main/java/kz/konturai/parser/service/ResearchPdfService.java b/src/main/java/kz/konturai/parser/service/ResearchPdfService.java
index f7c31ef..c27d290 100644
--- a/src/main/java/kz/konturai/parser/service/ResearchPdfService.java
+++ b/src/main/java/kz/konturai/parser/service/ResearchPdfService.java
@@ -6,6 +6,8 @@ import com.lowagie.text.pdf.ColumnText;
 import com.lowagie.text.pdf.PdfWriter;
 import kz.konturai.parser.dto.DeepResearchResponse;
 import org.springframework.stereotype.Service;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.ByteArrayOutputStream;
 import java.time.LocalDateTime;
@@ -21,6 +23,8 @@ import java.io.InputStream;
 @Service
 public class ResearchPdfService {
 
+    private static final Logger logger = LoggerFactory.getLogger(ResearchPdfService.class);
+
     // --- Шрифты с поддержкой кириллицы ---
     private final BaseFont baseFont;
     private final Font titleFont;
@@ -86,6 +90,20 @@ public class ResearchPdfService {
     }
 
     public byte[] generatePdfReport(String query, DeepResearchResponse researchResponse) {
+        try {
+            String mainContent = researchResponse == null ? null : researchResponse.getMainContent();
+            java.util.List<String> urls = researchResponse == null ? null : researchResponse.getVisitedUrls();
+            int contentLength = mainContent == null ? 0 : mainContent.length();
+            int urlCount = urls == null ? 0 : urls.size();
+            logger.info("PDF input (legacy): query='{}', contentLength={}, visitedUrlsCount={}", query, contentLength,
+                    urlCount);
+            if (logger.isDebugEnabled()) {
+                logger.debug("PDF input (legacy) full content:\n{}", mainContent);
+                logger.debug("PDF input (legacy) visitedUrls: {}", urls);
+            }
+        } catch (Exception logEx) {
+            // do not fail generation due to logging issue
+        }
         try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
             Document document = new Document(PageSize.A4, 36, 36, 36, 54); // Добавлены отступы
             PdfWriter writer = PdfWriter.getInstance(document, outputStream);
@@ -111,6 +129,18 @@ public class ResearchPdfService {
     }
 
     public byte[] generatePdfReport(String query, String synthesizedMarkdown, java.util.List<String> visitedUrls) {
+        try {
+            int contentLength = synthesizedMarkdown == null ? 0 : synthesizedMarkdown.length();
+            int urlCount = visitedUrls == null ? 0 : visitedUrls.size();
+            logger.info("PDF input (synthesized): query='{}', contentLength={}, visitedUrlsCount={}", query,
+                    contentLength, urlCount);
+            if (logger.isDebugEnabled()) {
+                logger.debug("PDF input (synthesized) full content:\n{}", synthesizedMarkdown);
+                logger.debug("PDF input (synthesized) visitedUrls: {}", visitedUrls);
+            }
+        } catch (Exception logEx) {
+            // do not fail generation due to logging issue
+        }
         try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
             Document document = new Document(PageSize.A4, 36, 36, 36, 54);
             PdfWriter writer = PdfWriter.getInstance(document, outputStream);