diff --git a/src/widgets/previewjob.h b/src/widgets/previewjob.h
--- a/src/widgets/previewjob.h
+++ b/src/widgets/previewjob.h
@@ -186,6 +186,8 @@
      **/
     int sequenceIndex() const;
 
+    void setDevicePixelRatio(qreal dpr);
+
     /**
      * Returns a list of all available preview plugins. The list
      * contains the basenames of the plugins' .desktop files (no path,
diff --git a/src/widgets/previewjob.cpp b/src/widgets/previewjob.cpp
--- a/src/widgets/previewjob.cpp
+++ b/src/widgets/previewjob.cpp
@@ -150,6 +150,7 @@
     QString thumbRoot;
     // List of encrypted mount points for checking if we should save thumbnail
     KMountPoint::List encryptedMountsList;
+    qreal devicePixelRatio = 1;
 
     void getOrCreateThumbnail();
     bool statResultThumbnail();
@@ -427,6 +428,11 @@
     return d_func()->sequenceIndex;
 }
 
+void KIO::PreviewJob::setDevicePixelRatio(qreal dpr)
+{
+    d_func()->devicePixelRatio = dpr;
+}
+
 void PreviewJob::setIgnoreMaximumSize(bool ignoreSize)
 {
     d_func()->ignoreMaximumSize = ignoreSize;
@@ -564,6 +570,10 @@
             thumb.text(QStringLiteral("Thumb::MTime")).toLongLong() != tOrig.toSecsSinceEpoch()) {
         return false;
     }
+    if (thumb.textKeys().contains(QStringLiteral("Thumb::DevicePixelRatio"))) {
+        qreal dpr = thumb.text(QStringLiteral("Thumb::DevicePixelRatio")).toDouble();
+        thumb.setDevicePixelRatio(dpr);
+    }
 
     QString thumbnailerVersion = currentItem.plugin->property(QStringLiteral("ThumbnailerVersion"), QVariant::String).toString();
 
@@ -659,6 +669,7 @@
     job->addMetaData(QStringLiteral("iconAlpha"), QString().setNum(iconAlpha));
     job->addMetaData(QStringLiteral("plugin"), currentItem.plugin->library());
     job->addMetaData(QStringLiteral("enabledPlugins"), enabledPlugins.join(QLatin1Char(',')));
+    job->addMetaData(QStringLiteral("devicePixelRatio"), QString::number(devicePixelRatio));
     if (sequenceIndex) {
         job->addMetaData(QStringLiteral("sequence-index"), QString().setNum(sequenceIndex));
     }
@@ -669,7 +680,7 @@
             shmdt((char *)shmaddr);
             shmctl(shmid, IPC_RMID, nullptr);
         }
-        shmid = shmget(IPC_PRIVATE, cacheWidth * cacheHeight * 4, IPC_CREAT | 0600);
+        shmid = shmget(IPC_PRIVATE, cacheWidth * cacheHeight * 4 * devicePixelRatio * devicePixelRatio, IPC_CREAT | 0600);
         if (shmid != -1) {
             shmaddr = (uchar *)(shmat(shmid, nullptr, SHM_RDONLY));
             if (shmaddr == (uchar *) - 1) {
@@ -702,9 +713,11 @@
         QDataStream str(data);
         int width, height;
         quint8 iFormat;
-        str >> width >> height >> iFormat;
+        qreal imgDevicePixelRatio;
+        str >> width >> height >> iFormat >> imgDevicePixelRatio;
         QImage::Format format = static_cast<QImage::Format>(iFormat);
         thumb = QImage(shmaddr, width, height, format).copy();
+        thumb.setDevicePixelRatio(imgDevicePixelRatio);
     } else
 #endif
         thumb.loadFromData(data);
@@ -719,6 +732,7 @@
         thumb.setText(QStringLiteral("Thumb::MTime"), QString::number(tOrig.toSecsSinceEpoch()));
         thumb.setText(QStringLiteral("Thumb::Size"), number(currentItem.item.size()));
         thumb.setText(QStringLiteral("Thumb::Mimetype"), currentItem.item.mimetype());
+        thumb.setText(QStringLiteral("Thumb::DevicePixelRatio"), QString::number(thumb.devicePixelRatio()));
         QString thumbnailerVersion = currentItem.plugin->property(QStringLiteral("ThumbnailerVersion"), QVariant::String).toString();
         QString signature = QLatin1String("KDE Thumbnail Generator ") + currentItem.plugin->name();
         if (!thumbnailerVersion.isEmpty()) {
@@ -740,11 +754,12 @@
 {
     Q_Q(PreviewJob);
     QPixmap pix;
-    if (thumb.width() > width || thumb.height() > height) {
-        pix = QPixmap::fromImage(thumb.scaled(QSize(width, height), Qt::KeepAspectRatio, Qt::SmoothTransformation));
+    if (thumb.width() > width * devicePixelRatio || thumb.height() > height  * devicePixelRatio) {
+        pix = QPixmap::fromImage(thumb.scaled(QSize(width * devicePixelRatio, height * devicePixelRatio), Qt::KeepAspectRatio, Qt::SmoothTransformation));
     } else {
         pix = QPixmap::fromImage(thumb);
     }
+    pix.setDevicePixelRatio(thumb.devicePixelRatioF());
     emit q->gotPreview(currentItem.item, pix);
 }
 
diff --git a/src/widgets/thumbcreator.h b/src/widgets/thumbcreator.h
--- a/src/widgets/thumbcreator.h
+++ b/src/widgets/thumbcreator.h
@@ -20,6 +20,8 @@
 #ifndef _THUMBCREATOR_H_
 #define _THUMBCREATOR_H_
 
+#include <QtGlobal>
+
 #include "kiowidgets_export.h"
 
 class QString;
@@ -129,11 +131,12 @@
      * @param height  The requested preview height (see the note on scaling
      *                above).
      * @param img     The QImage to store the preview in.
+     * @param devicePixelRatio
      *
      * @return @c true if a preview was successfully generated and store in @p
      *         img, @c false otherwise.
      */
-    virtual bool create(const QString &path, int width, int height, QImage &img) = 0; // KF6 TODO: turn first arg into QUrl (see thumbnail/htmlcreator.cpp)
+    virtual bool create(const QString &path, int width, int height, QImage &img, qreal devicePixelRatio = 1.0) = 0; // KF6 TODO: turn first arg into QUrl (see thumbnail/htmlcreator.cpp)
 
     /**
      * Returns the flags for this plugin.