diff --git a/database.cpp b/database.cpp
index 0ed0b51..591ab39 100644
--- a/database.cpp
+++ b/database.cpp
@@ -139,6 +139,28 @@ void Database::indexDir(const QDir &dir, QProgressDialog *progress)
         database.rollback();
 }
 
+void Database::reindex(QProgressDialog *progress)
+{
+    QVariantList deleteids;
+    QSqlDatabase database = QSqlDatabase::database();
+    QSqlQuery files = database.exec("SELECT id,file,mtime FROM fits_files");
+    progress->setMaximum(files.size());
+    int i = 0;
+    while(files.next())
+    {
+        QString path = files.value(1).toString();
+        QFileInfo file(path);
+        if(file.exists() && file.fileTime(QFileDevice::FileModificationTime).toUTC().toString(Qt::ISODate) != files.value(2).toString())
+            indexFile(file);
+        if(!file.exists())
+            deleteids.append(files.value(0));
+        progress->setValue(i++);
+    }
+    QSqlQuery deleteFiles("DELETE FROM fits_files WHERE id = ?", database);
+    deleteFiles.bindValue(0, deleteids);
+    deleteFiles.execBatch();
+}
+
 QStringList Database::getFitsKeywords()
 {
     m_headerKeywords.exec();
@@ -161,63 +183,68 @@ bool Database::indexDir2(const QDir &dir, QProgressDialog *progress)
         if(!indexDir2(dir.filePath(d), progress))
             return false;
     }
-    ImageInfoData info;
     for(const QFileInfo &file : files)
     {
         progress->setValue(m_progress++);
         if(progress->wasCanceled())return false;
-        QString filePath = file.absoluteFilePath();
-        QString mtime = file.fileTime(QFileDevice::FileModificationTime).toUTC().toString(Qt::ISODate);
-        m_checkFile.bindValue(0, filePath);
-        m_checkFile.exec();
-        if(m_checkFile.next())
-        {
-            if(m_checkFile.value(1).toString() == mtime)
-                continue;
-            else
-            {
-                m_deleteFile.bindValue(0, m_checkFile.value(0).toLongLong());
-                m_deleteFile.exec();
-            }
-        }
-
-        bool ok;
-        if(filePath.endsWith(".xisf", Qt::CaseInsensitive))
-            ok = readXISFHeader(filePath, info);
-        else
-            ok = readFITSHeader(filePath, info);
-
-        qlonglong last_id = -1;
-        if(ok)
-        {
-            m_insertFile.bindValue(0, filePath);
-            m_insertFile.bindValue(1, mtime);
-            if(!m_insertFile.exec())
-            {
-                qDebug() << m_insertFile.lastError();
-                return false;
-            }
-            last_id = m_insertFile.lastInsertId().toLongLong();
-            QVariantList file_id, keys, values, comments;
-            for(auto &record : info.fitsHeader)
-            {
-                file_id << last_id;
-                keys << QString(record.key);
-                values << record.value.toString();
-                comments << QString(record.comment);
-            }
-            m_insertFitsHeader.bindValue(0, file_id);
-            m_insertFitsHeader.bindValue(1, keys);
-            m_insertFitsHeader.bindValue(2, values);
-            m_insertFitsHeader.bindValue(3, comments);
-            if(!m_insertFitsHeader.execBatch())
-            {
-                qDebug() << m_insertFitsHeader.lastError();
-                return false;
-            }
-        }
-        qDebug() << filePath << last_id;
-        info.fitsHeader.clear();
+        if(!indexFile(file))return false;
     }
     return true;
 }
+
+bool Database::indexFile(const QFileInfo &file)
+{
+    ImageInfoData info;
+    QString filePath = file.absoluteFilePath();
+    QString mtime = file.fileTime(QFileDevice::FileModificationTime).toUTC().toString(Qt::ISODate);
+    m_checkFile.bindValue(0, filePath);
+    m_checkFile.exec();
+    if(m_checkFile.next())
+    {
+        if(m_checkFile.value(1).toString() == mtime)
+            return true;
+        else
+        {
+            m_deleteFile.bindValue(0, m_checkFile.value(0).toLongLong());
+            m_deleteFile.exec();
+        }
+    }
+
+    bool ok;
+    if(filePath.endsWith(".xisf", Qt::CaseInsensitive))
+        ok = readXISFHeader(filePath, info);
+    else
+        ok = readFITSHeader(filePath, info);
+
+    qlonglong last_id = -1;
+    if(ok)
+    {
+        m_insertFile.bindValue(0, filePath);
+        m_insertFile.bindValue(1, mtime);
+        if(!m_insertFile.exec())
+        {
+            qDebug() << m_insertFile.lastError();
+            return false;
+        }
+        last_id = m_insertFile.lastInsertId().toLongLong();
+        QVariantList file_id, keys, values, comments;
+        for(auto &record : info.fitsHeader)
+        {
+            file_id << last_id;
+            keys << QString(record.key);
+            values << record.value.toString();
+            comments << QString(record.comment);
+        }
+        m_insertFitsHeader.bindValue(0, file_id);
+        m_insertFitsHeader.bindValue(1, keys);
+        m_insertFitsHeader.bindValue(2, values);
+        m_insertFitsHeader.bindValue(3, comments);
+        if(!m_insertFitsHeader.execBatch())
+        {
+            qDebug() << m_insertFitsHeader.lastError();
+            return false;
+        }
+    }
+    qDebug() << filePath << last_id;
+    return true;
+}
diff --git a/database.h b/database.h
index e034770..a701052 100644
--- a/database.h
+++ b/database.h
@@ -31,9 +31,11 @@ public:
     void clearMarkedFiles();
 
     void indexDir(const QDir &dir, QProgressDialog *progress);
+    void reindex(QProgressDialog *progress);
     QStringList getFitsKeywords();
 protected:
     bool indexDir2(const QDir &dir, QProgressDialog *progress);
+    bool indexFile(const QFileInfo &file);
     bool checkError(QSqlQuery &query);
 };
 
diff --git a/mainwindow.cpp b/mainwindow.cpp
index f11797e..046505d 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -91,6 +91,7 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
     fileMenu->addAction(tr("Move marked files"), this, SLOT(moveMarked()));
     fileMenu->addAction(tr("Save as"), this, SLOT(saveAs()), QKeySequence("Ctrl+S"));
     fileMenu->addAction(tr("Index directory"), this, SLOT(indexDir()));
+    fileMenu->addAction(tr("Reindex files"), this, SLOT(reindex()));
     QAction *liveModeAction = fileMenu->addAction(tr("Live mode"), this, SLOT(liveMode(bool)));
     liveModeAction->setCheckable(true);
     fileMenu->addAction(tr("Exit"), this, SLOT(close()));
@@ -358,6 +359,13 @@ void MainWindow::indexDir()
     }
 }
 
+void MainWindow::reindex()
+{
+    QProgressDialog progressDialog(tr("Indexing FITS files"), tr("Cancel"), 0, 1, this);
+    progressDialog.setModal(true);
+    m_database->reindex(&progressDialog);
+}
+
 void MainWindow::saveAs()
 {
     QString selectedFilter;
diff --git a/mainwindow.h b/mainwindow.h
index 0413956..7de9ad6 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -45,6 +45,7 @@ protected slots:
     void loadFile(const QString &path);
     void loadFile(int row);
     void indexDir();
+    void reindex();
     void saveAs();
     void convert(const QString &outfile);
     void markImage();