diff --git a/src/main/java/ru/soune/nocopy/service/FileSimilarityService.java b/src/main/java/ru/soune/nocopy/service/FileSimilarityService.java
index 4401cad..4030844 100644
--- a/src/main/java/ru/soune/nocopy/service/FileSimilarityService.java
+++ b/src/main/java/ru/soune/nocopy/service/FileSimilarityService.java
@@ -18,6 +18,7 @@ import ru.soune.nocopy.exception.DuplicateImageException;
 import ru.soune.nocopy.repository.*;
 import ru.soune.nocopy.util.FileUtil;
 
+import java.io.File;
 import java.io.FileInputStream;
 import java.io.InputStream;
 import java.security.MessageDigest;
@@ -113,6 +114,7 @@ public class FileSimilarityService {
 
     public FileEntity findDuplicateByHash(String path, String mimeType, Long userId) throws Exception {
         String hash = calculateFileHash(path);
+
         User user = userRepository.findById(userId).orElseThrow();
         Company company = user.getCompany();
         List<Long> userIds = new ArrayList<>();
@@ -126,8 +128,13 @@ public class FileSimilarityService {
         List<FileEntity> fileEntityList = fileEntityRepository.findByMimeTypeAndUserIds(mimeType, userIds);
 
         for (FileEntity file : fileEntityList) {
-            if (calculateFileHash(file.getFilePath()).equals(hash)) {
-                return file;
+            File existingFile = new File(file.getProtectedFilePath());
+            File newFile = new File(path);
+
+            if (existingFile.length() == newFile.length()) {
+                if (calculateFileHash(file.getProtectedFilePath()).equals(hash)) {
+                    return file;
+                }
             }
         }
 
diff --git a/src/main/java/ru/soune/nocopy/service/file/impl/AudioLocalSearchImpl.java b/src/main/java/ru/soune/nocopy/service/file/impl/AudioLocalSearchImpl.java
index 76f2499..7d2e137 100644
--- a/src/main/java/ru/soune/nocopy/service/file/impl/AudioLocalSearchImpl.java
+++ b/src/main/java/ru/soune/nocopy/service/file/impl/AudioLocalSearchImpl.java
@@ -28,7 +28,7 @@ public class AudioLocalSearchImpl implements AudioLocalSearch {
 
         if (fileEntity == null) return null;
 
-        return fileUtil.createFileInfo(fileEntity, fileEntity.getFileExtension());
+        return fileUtil.createFileInfo(fileEntity, null);
     }
 
     @Override
diff --git a/src/main/java/ru/soune/nocopy/service/file/impl/DocumentLocalSearchImpl.java b/src/main/java/ru/soune/nocopy/service/file/impl/DocumentLocalSearchImpl.java
index 7e3f657..b7151d1 100644
--- a/src/main/java/ru/soune/nocopy/service/file/impl/DocumentLocalSearchImpl.java
+++ b/src/main/java/ru/soune/nocopy/service/file/impl/DocumentLocalSearchImpl.java
@@ -23,7 +23,7 @@ public class DocumentLocalSearchImpl implements DocumentLocalSearch {
     @Override
     public @Nullable FileProtector.FileInfo findByIds(@NotNull String ownerId, @NotNull String fileId) {
         FileEntity fileEntity = fileEntityRepository.findByIdAndUserId(fileId, Long.valueOf(ownerId));
-        FileProtector.FileInfo fileInfo = fileUtil.createFileInfo(fileEntity, fileEntity.getFileExtension());
+        FileProtector.FileInfo fileInfo = fileUtil.createFileInfo(fileEntity, null);
         log.info("fileInfo: {}", fileInfo);
 
         return fileInfo;