diff --git a/rtdata/languages/default b/rtdata/languages/default
index 84b28c955..bda477f14 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -2061,6 +2061,7 @@ SAMPLEFORMAT_16;16-bit floating-point
 SAMPLEFORMAT_32;24-bit floating-point
 SAMPLEFORMAT_64;32-bit floating-point
 SAVEDLG_AUTOSUFFIX;Automatically add a suffix if the file already exists
+SAVEDLG_BIGTIFF;BigTIFF
 SAVEDLG_FILEFORMAT;File format
 SAVEDLG_FILEFORMAT_FLOAT; floating-point
 SAVEDLG_FORCEFORMATOPTS;Force saving options
diff --git a/rtengine/iimage.h b/rtengine/iimage.h
index a544b454a..cdb7dd6eb 100644
--- a/rtengine/iimage.h
+++ b/rtengine/iimage.h
@@ -1882,7 +1882,13 @@ public:
       * @param bps can be 8 or 16 depending on the bits per pixels the output file will have
       * @param isFloat is true for saving float images. Will be ignored by file format not supporting float data
         @return the error code, 0 if none */
-    virtual int saveAsTIFF (const Glib::ustring &fname, int bps = -1, bool isFloat = false, bool uncompressed = false) const = 0;
+    virtual int saveAsTIFF (
+        const Glib::ustring &fname,
+        int bps = -1,
+        bool isFloat = false,
+        bool uncompressed = false,
+        bool big = false
+    ) const = 0;
     /** @brief Sets the progress listener if you want to follow the progress of the image saving operations (optional).
       * @param pl is the pointer to the class implementing the ProgressListener interface */
     virtual void setSaveProgressListener (ProgressListener* pl) = 0;
diff --git a/rtengine/image16.h b/rtengine/image16.h
index 25b777832..273ae63a1 100644
--- a/rtengine/image16.h
+++ b/rtengine/image16.h
@@ -81,7 +81,7 @@ public:
         return saveJPEG(fname, quality, subSamp);
     }
 
-    int saveAsTIFF(const Glib::ustring &fname, int bps = -1, bool isFloat = false, bool uncompressed = false) const override
+    int saveAsTIFF(const Glib::ustring &fname, int bps = -1, bool isFloat = false, bool uncompressed = false, bool big = false) const override
     {
         return saveTIFF(fname, bps, isFloat, uncompressed);
     }
diff --git a/rtengine/image8.h b/rtengine/image8.h
index 76a580bb6..416dc9143 100644
--- a/rtengine/image8.h
+++ b/rtengine/image8.h
@@ -79,9 +79,15 @@ public:
         return saveJPEG (fname, quality, subSamp);
     }
 
-    int saveAsTIFF (const Glib::ustring &fname, int bps = -1, bool isFloat = false, bool uncompressed = false) const override
+    int saveAsTIFF (
+        const Glib::ustring &fname,
+        int bps = -1,
+        bool isFloat = false,
+        bool uncompressed = false,
+        bool big = false
+    ) const override
     {
-        return saveTIFF (fname, bps, isFloat, uncompressed);
+        return saveTIFF (fname, bps, isFloat, uncompressed, big);
     }
 
     void setSaveProgressListener (ProgressListener* pl) override
diff --git a/rtengine/imagefloat.h b/rtengine/imagefloat.h
index fc3ba318d..d69df9325 100644
--- a/rtengine/imagefloat.h
+++ b/rtengine/imagefloat.h
@@ -82,9 +82,15 @@ public:
     {
         return saveJPEG (fname, quality, subSamp);
     }
-    int saveAsTIFF (const Glib::ustring &fname, int bps = -1, bool isFloat = false, bool uncompressed = false) const override
+    int saveAsTIFF (
+        const Glib::ustring &fname,
+        int bps = -1,
+        bool isFloat = false,
+        bool uncompressed = false,
+        bool big = false
+    ) const override
     {
-        return saveTIFF (fname, bps, isFloat, uncompressed);
+        return saveTIFF (fname, bps, isFloat, uncompressed, big);
     }
     void setSaveProgressListener (ProgressListener* pl) override
     {
diff --git a/rtengine/imageio.cc b/rtengine/imageio.cc
index ce44d1ff4..573a391aa 100644
--- a/rtengine/imageio.cc
+++ b/rtengine/imageio.cc
@@ -17,21 +17,17 @@
  *  You should have received a copy of the GNU General Public License
  *  along with RawTherapee.  If not, see <https://www.gnu.org/licenses/>.
  */
-#include <png.h>
-#include <glib/gstdio.h>
-#include <tiff.h>
-#include <tiffio.h>
 #include <cstdio>
 #include <cstring>
-#include <fcntl.h>
-#include <libiptcdata/iptc-jpeg.h>
 #include <memory>
-#include "rt_math.h"
-#include "procparams.h"
-#include "utils.h"
-#include "../rtgui/options.h"
-#include "../rtgui/version.h"
-#include "../rtexif/rtexif.h"
+#include <string>
+
+#include <fcntl.h>
+#include <glib/gstdio.h>
+#include <libiptcdata/iptc-jpeg.h>
+#include <png.h>
+#include <tiff.h>
+#include <tiffio.h>
 
 #ifdef WIN32
 #include <winsock2.h>
@@ -39,12 +35,20 @@
 #include <netinet/in.h>
 #endif
 
+#include "color.h"
+#include "iccjpeg.h"
 #include "imageio.h"
 #include "iptcpairs.h"
-#include "iccjpeg.h"
-#include "color.h"
-
 #include "jpeg.h"
+#include "procparams.h"
+#include "rt_math.h"
+#include "utils.h"
+
+#include "../rtgui/options.h"
+#include "../rtgui/version.h"
+
+#include "../rtexif/rtexif.h"
+
 
 using namespace std;
 using namespace rtengine;
@@ -1328,7 +1332,13 @@ int ImageIO::saveJPEG (const Glib::ustring &fname, int quality, int subSamp) con
     return IMIO_SUCCESS;
 }
 
-int ImageIO::saveTIFF (const Glib::ustring &fname, int bps, bool isFloat, bool uncompressed) const
+int ImageIO::saveTIFF (
+    const Glib::ustring &fname,
+    int bps,
+    bool isFloat,
+    bool uncompressed,
+    bool big
+) const
 {
     if (getWidth() < 1 || getHeight() < 1) {
         return IMIO_HEADERERROR;
@@ -1345,15 +1355,28 @@ int ImageIO::saveTIFF (const Glib::ustring &fname, int bps, bool isFloat, bool u
     int lineWidth = width * 3 * bps / 8;
     unsigned char* linebuffer = new unsigned char[lineWidth];
 
+    std::string mode = "w";
+
     // little hack to get libTiff to use proper byte order (see TIFFClienOpen()):
-    const char *mode = !exifRoot ? "w" : (exifRoot->getOrder() == rtexif::INTEL ? "wl" : "wb");
+    if (exifRoot) {
+        if (exifRoot->getOrder() == rtexif::INTEL) {
+            mode += 'l';
+        } else {
+            mode += 'b';
+        }
+    }
+
+    if (big) {
+        mode += '8';
+    }
+
 #ifdef WIN32
     FILE *file = g_fopen_withBinaryAndLock (fname);
     int fileno = _fileno(file);
     int osfileno = _get_osfhandle(fileno);
-    TIFF* out = TIFFFdOpen (osfileno, fname.c_str(), mode);
+    TIFF* out = TIFFFdOpen (osfileno, fname.c_str(), mode.c_str());
 #else
-    TIFF* out = TIFFOpen(fname.c_str(), mode);
+    TIFF* out = TIFFOpen(fname.c_str(), mode.c_str());
     int fileno = TIFFFileno (out);
 #endif
 
diff --git a/rtengine/imageio.h b/rtengine/imageio.h
index 566fef13b..e900feccd 100644
--- a/rtengine/imageio.h
+++ b/rtengine/imageio.h
@@ -113,7 +113,13 @@ public:
 
     int savePNG (const Glib::ustring &fname, int bps = -1) const;
     int saveJPEG (const Glib::ustring &fname, int quality = 100, int subSamp = 3) const;
-    int saveTIFF (const Glib::ustring &fname, int bps = -1, bool isFloat = false, bool uncompressed = false) const;
+    int saveTIFF (
+        const Glib::ustring &fname,
+        int bps = -1,
+        bool isFloat = false,
+        bool uncompressed = false,
+        bool big = false
+    ) const;
 
     cmsHPROFILE getEmbeddedProfile () const;
     void getEmbeddedProfileData (int& length, unsigned char*& pdata) const;
diff --git a/rtgui/batchqueue.cc b/rtgui/batchqueue.cc
index 19da96fb5..4e25475f0 100644
--- a/rtgui/batchqueue.cc
+++ b/rtgui/batchqueue.cc
@@ -264,6 +264,7 @@ bool BatchQueue::saveBatchQueue ()
                  << saveFormat.tiffBits << '|'  << (saveFormat.tiffFloat ? 1 : 0) << '|'  << saveFormat.tiffUncompressed << '|'
                  << saveFormat.saveParams << '|' << entry->forceFormatOpts << '|'
                  << entry->fast_pipeline << '|'
+                 << saveFormat.bigTiff << '|'
                  << std::endl;
         }
     }
@@ -331,6 +332,7 @@ bool BatchQueue::loadBatchQueue ()
             const auto saveParams = nextIntOr (options.saveFormat.saveParams);
             const auto forceFormatOpts = nextIntOr (options.forceFormatOpts);
             const auto fast = nextIntOr(false);
+            const auto bigTiff = nextIntOr (options.saveFormat.bigTiff);
 
             rtengine::procparams::ProcParams pparams;
 
@@ -370,6 +372,7 @@ bool BatchQueue::loadBatchQueue ()
                 saveFormat.tiffBits = tiffBits;
                 saveFormat.tiffFloat = tiffFloat == 1;
                 saveFormat.tiffUncompressed = tiffUncompressed != 0;
+                saveFormat.bigTiff = bigTiff != 0;
                 saveFormat.saveParams = saveParams != 0;
                 entry->forceFormatOpts = forceFormatOpts != 0;
             } else {
@@ -693,7 +696,13 @@ rtengine::ProcessingJob* BatchQueue::imageReady(rtengine::IImagefloat* img)
         int err = 0;
 
         if (saveFormat.format == "tif") {
-            err = img->saveAsTIFF (fname, saveFormat.tiffBits, saveFormat.tiffFloat, saveFormat.tiffUncompressed);
+            err = img->saveAsTIFF (
+                fname,
+                saveFormat.tiffBits,
+                saveFormat.tiffFloat,
+                saveFormat.tiffUncompressed,
+                saveFormat.bigTiff
+            );
         } else if (saveFormat.format == "png") {
             err = img->saveAsPNG (fname, saveFormat.pngBits);
         } else if (saveFormat.format == "jpg") {
diff --git a/rtgui/batchqueueentry.cc b/rtgui/batchqueueentry.cc
index 9fe4dd605..7499fb63b 100644
--- a/rtgui/batchqueueentry.cc
+++ b/rtgui/batchqueueentry.cc
@@ -201,6 +201,9 @@ std::tuple<Glib::ustring, bool> BatchQueueEntry::getToolTip (int x, int y) const
                 if (saveFormat.tiffUncompressed) {
                     tooltip += Glib::ustring::compose("\n%1", M("SAVEDLG_TIFFUNCOMPRESSED"));
                 }
+                if (saveFormat.bigTiff) {
+                    tooltip += Glib::ustring::compose("\n%1", M("SAVEDLG_BIGTIFF"));
+                }
             }
         }
     }
diff --git a/rtgui/editorpanel.cc b/rtgui/editorpanel.cc
index 95808d4b0..ffe13fea3 100644
--- a/rtgui/editorpanel.cc
+++ b/rtgui/editorpanel.cc
@@ -2013,7 +2013,7 @@ bool EditorPanel::idle_saveImage (ProgressConnector<rtengine::IImagefloat*> *pc,
         img->setSaveProgressListener (parent->getProgressListener());
 
         if (sf.format == "tif")
-            ld->startFunc (sigc::bind (sigc::mem_fun (img, &rtengine::IImagefloat::saveAsTIFF), fname, sf.tiffBits, sf.tiffFloat, sf.tiffUncompressed),
+            ld->startFunc (sigc::bind (sigc::mem_fun (img, &rtengine::IImagefloat::saveAsTIFF), fname, sf.tiffBits, sf.tiffFloat, sf.tiffUncompressed, sf.bigTiff),
                            sigc::bind (sigc::mem_fun (*this, &EditorPanel::idle_imageSaved), ld, img, fname, sf, pparams));
         else if (sf.format == "png")
             ld->startFunc (sigc::bind (sigc::mem_fun (img, &rtengine::IImagefloat::saveAsPNG), fname, sf.pngBits),
@@ -2270,7 +2270,7 @@ bool EditorPanel::saveImmediately (const Glib::ustring &filename, const SaveForm
     if (gimpPlugin) {
         err = img->saveAsTIFF (filename, 32, true, true);
     } else if (sf.format == "tif") {
-        err = img->saveAsTIFF (filename, sf.tiffBits, sf.tiffFloat, sf.tiffUncompressed);
+        err = img->saveAsTIFF (filename, sf.tiffBits, sf.tiffFloat, sf.tiffUncompressed, sf.bigTiff);
     } else if (sf.format == "png") {
         err = img->saveAsPNG (filename, sf.pngBits);
     } else if (sf.format == "jpg") {
@@ -2380,7 +2380,7 @@ bool EditorPanel::idle_sendToGimp ( ProgressConnector<rtengine::IImagefloat*> *p
 
         ProgressConnector<int> *ld = new ProgressConnector<int>();
         img->setSaveProgressListener (parent->getProgressListener());
-        ld->startFunc (sigc::bind (sigc::mem_fun (img, &rtengine::IImagefloat::saveAsTIFF), fileName, sf.tiffBits, sf.tiffFloat, sf.tiffUncompressed),
+        ld->startFunc (sigc::bind (sigc::mem_fun (img, &rtengine::IImagefloat::saveAsTIFF), fileName, sf.tiffBits, sf.tiffFloat, sf.tiffUncompressed, sf.bigTiff),
                        sigc::bind (sigc::mem_fun (*this, &EditorPanel::idle_sentToGimp), ld, img, fileName));
     } else {
         Glib::ustring msg_ = Glib::ustring ("<b> Error during image processing\n</b>");
diff --git a/rtgui/options.cc b/rtgui/options.cc
index 66b9e92a1..e230dcf8a 100644
--- a/rtgui/options.cc
+++ b/rtgui/options.cc
@@ -313,6 +313,7 @@ void Options::setDefaults()
     saveFormat.tiffBits = 16;
     saveFormat.tiffFloat = false;
     saveFormat.tiffUncompressed = true;
+    saveFormat.bigTiff = false;
     saveFormat.saveParams = true;
 
     saveFormatBatch.format = "jpg";
@@ -1046,6 +1047,10 @@ void Options::readFromFile(Glib::ustring fname)
                     saveFormat.tiffUncompressed = keyFile.get_boolean("Output", "TiffUncompressed");
                 }
 
+                if (keyFile.has_key("Output", "BigTiff")) {
+                    saveFormat.bigTiff = keyFile.get_boolean("Output", "BigTiff");
+                }
+
                 if (keyFile.has_key("Output", "SaveProcParams")) {
                     saveFormat.saveParams = keyFile.get_boolean("Output", "SaveProcParams");
                 }
@@ -2447,6 +2452,7 @@ void Options::saveToFile(Glib::ustring fname)
         keyFile.set_integer("Output", "TiffBps", saveFormat.tiffBits);
         keyFile.set_boolean("Output", "TiffFloat", saveFormat.tiffFloat);
         keyFile.set_boolean("Output", "TiffUncompressed", saveFormat.tiffUncompressed);
+        keyFile.set_boolean("Output", "BigTiff", saveFormat.bigTiff);
         keyFile.set_boolean("Output", "SaveProcParams", saveFormat.saveParams);
 
         keyFile.set_string("Output", "FormatBatch", saveFormatBatch.format);
diff --git a/rtgui/options.h b/rtgui/options.h
index 286c64df0..5fb4e4f8b 100644
--- a/rtgui/options.h
+++ b/rtgui/options.h
@@ -72,6 +72,7 @@ struct SaveFormat {
         int _tiff_bits,
         bool _tiff_float,
         bool _tiff_uncompressed,
+        bool _big_tiff,
         bool _save_params
     ) :
         format(_format),
@@ -81,6 +82,7 @@ struct SaveFormat {
         tiffBits(_tiff_bits),
         tiffFloat(_tiff_float),
         tiffUncompressed(_tiff_uncompressed),
+        bigTiff(_big_tiff),
         saveParams(_save_params)
     {
     }
@@ -98,6 +100,7 @@ struct SaveFormat {
             _tiff_bits,
             _tiff_float,
             true,
+            false,
             true
         )
     {
@@ -114,6 +117,7 @@ struct SaveFormat {
     int tiffBits;
     bool tiffFloat;
     bool tiffUncompressed;
+    bool bigTiff;
     bool saveParams;
 };
 
diff --git a/rtgui/saveformatpanel.cc b/rtgui/saveformatpanel.cc
index 00f6e7b2b..773ee9105 100644
--- a/rtgui/saveformatpanel.cc
+++ b/rtgui/saveformatpanel.cc
@@ -100,6 +100,11 @@ SaveFormatPanel::SaveFormatPanel () : listener (nullptr)
     tiffUncompressed->signal_toggled().connect( sigc::mem_fun(*this, &SaveFormatPanel::formatChanged));
     tiffUncompressed->show_all();
 
+    bigTiff = new Gtk::CheckButton (M("SAVEDLG_BIGTIFF"));
+    setExpandAlignProperties(bigTiff, true, false, Gtk::ALIGN_FILL, Gtk::ALIGN_CENTER);
+    bigTiff->signal_toggled().connect( sigc::mem_fun(*this, &SaveFormatPanel::formatChanged));
+    bigTiff->show_all();
+
 
     // ---------------------  MAIN BOX
 
@@ -114,12 +119,14 @@ SaveFormatPanel::SaveFormatPanel () : listener (nullptr)
     attach (*hb1, 0, 0, 1, 1);
     attach (*jpegOpts, 0, 1, 1, 1);
     attach (*tiffUncompressed, 0, 2, 1, 1);
+    attach (*bigTiff, 0, 3, 1, 1);
     attach (*savesPP, 0, 4, 1, 2);
 }
 SaveFormatPanel::~SaveFormatPanel ()
 {
     delete jpegQual;
     delete tiffUncompressed;
+    delete bigTiff;
 }
 
 void SaveFormatPanel::init (SaveFormat &sf)
@@ -158,6 +165,7 @@ void SaveFormatPanel::init (SaveFormat &sf)
     jpegQual->setValue(sf.jpegQuality);
     savesPP->set_active(sf.saveParams);
     tiffUncompressed->set_active(sf.tiffUncompressed);
+    bigTiff->set_active(sf.bigTiff);
 
     listener = tmp;
 }
@@ -175,6 +183,7 @@ SaveFormat SaveFormatPanel::getFormat ()
     sf.jpegQuality = jpegQual->getValue();
     sf.jpegSubSamp = jpegSubSamp->get_active_row_number() + 1;
     sf.tiffUncompressed = tiffUncompressed->get_active();
+    sf.bigTiff = bigTiff->get_active();
     sf.saveParams = savesPP->get_active();
 
     return sf;
@@ -193,12 +202,15 @@ void SaveFormatPanel::formatChanged ()
     if (fr == "jpg") {
         jpegOpts->show_all();
         tiffUncompressed->hide();
+        bigTiff->hide();
     } else if (fr == "png") {
         jpegOpts->hide();
         tiffUncompressed->hide();
+        bigTiff->hide();
     } else if (fr == "tif") {
         jpegOpts->hide();
         tiffUncompressed->show_all();
+        bigTiff->show_all();
     }
 
     if (listener) {
diff --git a/rtgui/saveformatpanel.h b/rtgui/saveformatpanel.h
index af9baa58a..9d9f6266e 100644
--- a/rtgui/saveformatpanel.h
+++ b/rtgui/saveformatpanel.h
@@ -39,6 +39,7 @@ class SaveFormatPanel : public Gtk::Grid, public AdjusterListener, public rtengi
 protected:
     Adjuster*           jpegQual;
     Gtk::CheckButton*   tiffUncompressed;
+    Gtk::CheckButton*   bigTiff;
     MyComboBoxText*     format;
     MyComboBoxText*     jpegSubSamp;
     Gtk::Grid*          formatOpts;