diff --git a/lib/I18n/translations/english.yaml b/lib/I18n/translations/english.yaml
index 1f2abb41..6a822063 100644
--- a/lib/I18n/translations/english.yaml
+++ b/lib/I18n/translations/english.yaml
@@ -170,6 +170,7 @@ STR_FILENAME: "Filename"
 STR_BINARY: "Binary"
 STR_MENU_KOSYNC_BEHAVIOR: "Sync Behavior"
 STR_KO_SYNC_ON_BOOK_CLOSE: "Auto-Push on Book Close"
+STR_SEND_METADATA: "Send Document Metadata"
 STR_KO_AUTO_SYNC_SKIPPED: "Remote ahead, skipping"
 STR_KO_LONGPRESS_HINT: "Hold Confirm to open with sync"
 STR_SET_CREDENTIALS_FIRST: "Set credentials first"
diff --git a/lib/KOReaderSync/KOReaderCredentialStore.cpp b/lib/KOReaderSync/KOReaderCredentialStore.cpp
index 05a2b3ab..a0655690 100644
--- a/lib/KOReaderSync/KOReaderCredentialStore.cpp
+++ b/lib/KOReaderSync/KOReaderCredentialStore.cpp
@@ -175,3 +175,8 @@ void KOReaderCredentialStore::setMatchMethod(DocumentMatchMethod method) {
   matchMethod = method;
   LOG_DBG("KRS", "Set match method: %s", method == DocumentMatchMethod::FILENAME ? "Filename" : "Binary");
 }
+
+void KOReaderCredentialStore::setSendMetadata(bool value) {
+  sendMetadata = value;
+  LOG_DBG("KRS", "Send metadata: %s", value ? "enabled" : "disabled");
+}
diff --git a/lib/KOReaderSync/KOReaderCredentialStore.h b/lib/KOReaderSync/KOReaderCredentialStore.h
index 89e008d0..4ed55a28 100644
--- a/lib/KOReaderSync/KOReaderCredentialStore.h
+++ b/lib/KOReaderSync/KOReaderCredentialStore.h
@@ -27,6 +27,7 @@ class KOReaderCredentialStore {
   std::string password;
   std::string serverUrl;                                            // Custom sync server URL (empty = default)
   DocumentMatchMethod matchMethod = DocumentMatchMethod::FILENAME;  // Default to filename for compatibility
+  bool sendMetadata = false;
 
   // Private constructor for singleton
   KOReaderCredentialStore() = default;
@@ -72,6 +73,10 @@ class KOReaderCredentialStore {
   // Document matching method
   void setMatchMethod(DocumentMatchMethod method);
   DocumentMatchMethod getMatchMethod() const { return matchMethod; }
+
+  // Send document metadata (filename, title, authors) with progress uploads
+  void setSendMetadata(bool value);
+  bool getSendMetadata() const { return sendMetadata; }
 };
 
 // Helper macro to access credential store
diff --git a/lib/KOReaderSync/KOReaderSyncClient.cpp b/lib/KOReaderSync/KOReaderSyncClient.cpp
index 9bfc1087..7030488e 100644
--- a/lib/KOReaderSync/KOReaderSyncClient.cpp
+++ b/lib/KOReaderSync/KOReaderSyncClient.cpp
@@ -555,6 +555,13 @@ KOReaderSyncClient::Error KOReaderSyncClient::updateProgress(const KOReaderProgr
   doc["device"] = DEVICE_NAME;
   doc["device_id"] = DEVICE_ID;
 
+  if (progress.metadata) {
+    JsonObject meta = doc["metadata"].to<JsonObject>();
+    meta["filename"] = progress.metadata->filename;
+    meta["title"] = progress.metadata->title;
+    meta["authors"] = progress.metadata->authors;
+  }
+
   std::string body;
   serializeJson(doc, body);
 
diff --git a/lib/KOReaderSync/KOReaderSyncClient.h b/lib/KOReaderSync/KOReaderSyncClient.h
index 8ffa0203..faecb5bb 100644
--- a/lib/KOReaderSync/KOReaderSyncClient.h
+++ b/lib/KOReaderSync/KOReaderSyncClient.h
@@ -1,16 +1,29 @@
 #pragma once
+#include <optional>
 #include <string>
 
+/**
+ * Optional document metadata sent alongside progress uploads.
+ * Only populated when KOReaderCredentialStore::getSendMetadata() is true.
+ * The official sync server ignores this field; custom servers may use it.
+ */
+struct KOReaderMetadata {
+  std::string filename;
+  std::string title;
+  std::string authors;
+};
+
 /**
  * Progress data from KOReader sync server.
  */
 struct KOReaderProgress {
-  std::string document;  // Document hash
-  std::string progress;  // XPath-like progress string
-  float percentage;      // Progress percentage (0.0 to 1.0)
-  std::string device;    // Device name
-  std::string deviceId;  // Device ID
-  int64_t timestamp;     // Unix timestamp of last update
+  std::string document;                      // Document hash
+  std::string progress;                      // XPath-like progress string
+  float percentage;                          // Progress percentage (0.0 to 1.0)
+  std::string device;                        // Device name
+  std::string deviceId;                      // Device ID
+  int64_t timestamp;                         // Unix timestamp of last update
+  std::optional<KOReaderMetadata> metadata;  // Optional document metadata
 };
 
 /**
diff --git a/src/JsonSettingsIO.cpp b/src/JsonSettingsIO.cpp
index aaa1fa87..2723d325 100644
--- a/src/JsonSettingsIO.cpp
+++ b/src/JsonSettingsIO.cpp
@@ -296,6 +296,7 @@ bool JsonSettingsIO::saveKOReader(const KOReaderCredentialStore& store, const ch
   doc["password_obf"] = obfuscation::obfuscateToBase64(store.getPassword());
   doc["serverUrl"] = store.getServerUrl();
   doc["matchMethod"] = static_cast<uint8_t>(store.getMatchMethod());
+  doc["sendMetadata"] = store.getSendMetadata();
 
   String json;
   serializeJson(doc, json);
@@ -321,6 +322,7 @@ bool JsonSettingsIO::loadKOReader(KOReaderCredentialStore& store, const char* js
   store.serverUrl = doc["serverUrl"] | std::string("");
   uint8_t method = doc["matchMethod"] | (uint8_t)0;
   store.matchMethod = static_cast<DocumentMatchMethod>(method);
+  store.sendMetadata = doc["sendMetadata"] | false;
 
   LOG_DBG("KRS", "Loaded KOReader credentials for user: %s", store.username.c_str());
   return true;
diff --git a/src/SettingsList.h b/src/SettingsList.h
index c2ad45b0..0e8f548d 100644
--- a/src/SettingsList.h
+++ b/src/SettingsList.h
@@ -276,6 +276,19 @@ inline const std::vector<SettingInfo> list = {
         "koMatchMethod", StrId::STR_KOREADER_SYNC),
     SettingInfo::Toggle(StrId::STR_KO_SYNC_ON_BOOK_CLOSE, &CrossPointSettings::koSyncOnBookClose, "koSyncOnBookClose",
                         StrId::STR_KOREADER_SYNC),
+    []() {
+      SettingInfo s;
+      s.nameId = StrId::STR_SEND_METADATA;
+      s.type = SettingType::TOGGLE;
+      s.key = "koSendMetadata";
+      s.category = StrId::STR_KOREADER_SYNC;
+      s.valueGetter = [](const void*) -> uint8_t { return KOREADER_STORE.getSendMetadata() ? 1u : 0u; };
+      s.valueSetter = [](void*, uint8_t v) {
+        KOREADER_STORE.setSendMetadata(v != 0);
+        KOREADER_STORE.saveToFile();
+      };
+      return s;
+    }(),
 
     // --- Status Bar Settings (web-only, uses StatusBarSettingsActivity) ---
     SettingInfo::Toggle(StrId::STR_CHAPTER_PAGE_COUNT, &CrossPointSettings::statusBarChapterPageCount,
diff --git a/src/activities/reader/KOReaderSyncActivity.cpp b/src/activities/reader/KOReaderSyncActivity.cpp
index 99602f72..2d86d6b5 100644
--- a/src/activities/reader/KOReaderSyncActivity.cpp
+++ b/src/activities/reader/KOReaderSyncActivity.cpp
@@ -405,6 +405,7 @@ void KOReaderSyncActivity::performUpload() {
   progress.document = documentHash;
   progress.progress = localProgress.xpath;
   progress.percentage = localProgress.percentage;
+  progress.metadata = localDocumentMetadata;
 
   const auto result = KOReaderSyncClient::updateProgress(progress);
   KOReaderSyncClient::endPersistentSession();
@@ -717,6 +718,18 @@ bool KOReaderSyncActivity::computeLocalProgressAndChapter() {
   localChapterLabel = (localTocIndex >= 0)
                           ? epub->getTocItem(localTocIndex).title
                           : (std::string(tr(STR_SECTION_PREFIX)) + std::to_string(currentSpineIndex + 1));
+
+  if (KOREADER_STORE.getSendMetadata()) {
+    const size_t slash = epubPath.rfind('/');
+    KOReaderMetadata meta;
+    meta.filename = (slash != std::string::npos) ? epubPath.substr(slash + 1) : epubPath;
+    meta.title = epub->getTitle();
+    meta.authors = epub->getAuthor();
+    localDocumentMetadata = std::move(meta);
+  } else {
+    localDocumentMetadata.reset();
+  }
+
   return true;
 }
 
diff --git a/src/activities/reader/KOReaderSyncActivity.h b/src/activities/reader/KOReaderSyncActivity.h
index 003b8ead..0985ac22 100644
--- a/src/activities/reader/KOReaderSyncActivity.h
+++ b/src/activities/reader/KOReaderSyncActivity.h
@@ -93,6 +93,7 @@ class KOReaderSyncActivity final : public Activity {
   KOReaderPosition localProgress;
   std::string remoteChapterLabel;
   std::string localChapterLabel;
+  std::optional<KOReaderMetadata> localDocumentMetadata;
 
   // Selection in result screen (0=Apply, 1=Upload)
   int selectedOption = 0;
diff --git a/src/activities/settings/KOReaderSettingsActivity.cpp b/src/activities/settings/KOReaderSettingsActivity.cpp
index 091e1020..c88487fb 100644
--- a/src/activities/settings/KOReaderSettingsActivity.cpp
+++ b/src/activities/settings/KOReaderSettingsActivity.cpp
@@ -17,7 +17,7 @@ KOReaderSettingsActivity::KOReaderSettingsActivity(GfxRenderer& renderer, Mapped
 }
 
 void KOReaderSettingsActivity::buildMenuItems() {
-  menuItems.reserve(7);
+  menuItems.reserve(8);
   // Username, Password, Server URL: ACTION items with custom value display
   menuItems.push_back(SettingInfo::Action(StrId::STR_SYNC_SERVER_URL, SettingAction::None)
                           .withSubcategory(StrId::STR_MENU_KOSYNC_SERVER));
@@ -35,6 +35,17 @@ void KOReaderSettingsActivity::buildMenuItems() {
                           .withSubcategory(StrId::STR_MENU_KOSYNC_BEHAVIOR));
   menuItems.push_back(SettingInfo::Toggle(StrId::STR_KO_SYNC_ON_BOOK_CLOSE, &CrossPointSettings::koSyncOnBookClose,
                                           "koSyncOnBookClose"));
+  {
+    SettingInfo s;
+    s.nameId = StrId::STR_SEND_METADATA;
+    s.type = SettingType::TOGGLE;
+    s.valueGetter = [](const void*) -> uint8_t { return KOREADER_STORE.getSendMetadata() ? 1u : 0u; };
+    s.valueSetter = [](void*, uint8_t v) {
+      KOREADER_STORE.setSendMetadata(v != 0);
+      KOREADER_STORE.saveToFile();
+    };
+    menuItems.push_back(std::move(s));
+  }
 
   // Authenticate and Register: ACTION items
   menuItems.push_back(