diff --git a/komga/src/main/kotlin/org/gotson/komga/domain/service/BookImporter.kt b/komga/src/main/kotlin/org/gotson/komga/domain/service/BookImporter.kt
index ea01ef6c..51ba2c80 100644
--- a/komga/src/main/kotlin/org/gotson/komga/domain/service/BookImporter.kt
+++ b/komga/src/main/kotlin/org/gotson/komga/domain/service/BookImporter.kt
@@ -11,6 +11,7 @@ import org.gotson.komga.domain.model.Media
 import org.gotson.komga.domain.model.PathContainedInPath
 import org.gotson.komga.domain.model.Series
 import org.gotson.komga.domain.model.Sidecar
+import org.gotson.komga.domain.model.ThumbnailBook
 import org.gotson.komga.domain.model.withCode
 import org.gotson.komga.domain.persistence.BookMetadataRepository
 import org.gotson.komga.domain.persistence.BookRepository
@@ -20,6 +21,7 @@ import org.gotson.komga.domain.persistence.MediaRepository
 import org.gotson.komga.domain.persistence.ReadListRepository
 import org.gotson.komga.domain.persistence.ReadProgressRepository
 import org.gotson.komga.domain.persistence.SidecarRepository
+import org.gotson.komga.domain.persistence.ThumbnailBookRepository
 import org.gotson.komga.language.toIndexedMap
 import org.springframework.context.ApplicationEventPublisher
 import org.springframework.stereotype.Service
@@ -52,6 +54,7 @@ class BookImporter(
   private val bookRepository: BookRepository,
   private val mediaRepository: MediaRepository,
   private val metadataRepository: BookMetadataRepository,
+  private val thumbnailBookRepository: ThumbnailBookRepository,
   private val readProgressRepository: ReadProgressRepository,
   private val readListRepository: ReadListRepository,
   private val libraryRepository: LibraryRepository,
@@ -191,6 +194,11 @@ class BookImporter(
           metadataRepository.update(it.copy(bookId = importedBook.id))
         }
 
+        // copy user uploaded thumbnails
+        thumbnailBookRepository.findAllByBookIdAndType(bookToUpgrade.id, setOf(ThumbnailBook.Type.USER_UPLOADED)).forEach { deleted ->
+          thumbnailBookRepository.update(deleted.copy(bookId = importedBook.id))
+        }
+
         // copy read progress
         readProgressRepository.findAllByBookId(bookToUpgrade.id)
           .map { it.copy(bookId = importedBook.id) }
diff --git a/komga/src/test/kotlin/org/gotson/komga/domain/service/BookImporterTest.kt b/komga/src/test/kotlin/org/gotson/komga/domain/service/BookImporterTest.kt
index 88d07b95..f2ff8ac7 100644
--- a/komga/src/test/kotlin/org/gotson/komga/domain/service/BookImporterTest.kt
+++ b/komga/src/test/kotlin/org/gotson/komga/domain/service/BookImporterTest.kt
@@ -13,10 +13,13 @@ import org.gotson.komga.application.tasks.TaskEmitter
 import org.gotson.komga.domain.model.Book
 import org.gotson.komga.domain.model.BookPage
 import org.gotson.komga.domain.model.CopyMode
+import org.gotson.komga.domain.model.Dimension
 import org.gotson.komga.domain.model.KomgaUser
+import org.gotson.komga.domain.model.MarkSelectedPreference
 import org.gotson.komga.domain.model.Media
 import org.gotson.komga.domain.model.PathContainedInPath
 import org.gotson.komga.domain.model.ReadList
+import org.gotson.komga.domain.model.ThumbnailBook
 import org.gotson.komga.domain.model.makeBook
 import org.gotson.komga.domain.model.makeLibrary
 import org.gotson.komga.domain.model.makeSeries
@@ -372,6 +375,8 @@ class BookImporterTest(
         )
       }
 
+      bookLifecycle.addThumbnailForBook(ThumbnailBook(ByteArray(10), type = ThumbnailBook.Type.USER_UPLOADED, mediaType = "image/jpeg", fileSize = 10L, dimension = Dimension(1, 1), bookId = bookToUpgrade.id), MarkSelectedPreference.YES)
+
       // when
       bookImporter.importBook(sourceFile, series, CopyMode.MOVE, upgradeBookId = bookToUpgrade.id)
 
@@ -395,6 +400,11 @@ class BookImporterTest(
         assertThat(numberSortLock).isTrue
       }
 
+      val thumbnail = bookLifecycle.getThumbnail(books[2].id)
+      assertThat(thumbnail).isNotNull
+      assertThat(thumbnail!!.type).isEqualTo(ThumbnailBook.Type.USER_UPLOADED)
+      assertThat(thumbnail.fileSize).isEqualTo(10L)
+
       assertThat(sourceFile).doesNotExist()
     }
   }