diff --git a/README.md b/README.md
index 7bb59b6d..110f5a33 100644
--- a/README.md
+++ b/README.md
@@ -158,7 +158,7 @@ For flatpak, Docker, and AppImage versions, refer to the wiki: https://github.co
   - May happen when [using PNG with Kindle Scribe](https://github.com/ciromattia/kcc/issues/665) or [any format with a Kindle Colorsoft](https://github.com/ciromattia/kcc/issues/768). Solve by using JPG with Kindle Scribe or buying a Kobo Colour. Happens more often when turning pages really fast. You can try PDF output.
     Going back a few pages and exiting and re-entering book should fix it temporarily.
 - What output format should I use?
-  - MOBI for Kindles. CBZ for Kindle DX. CBZ for Koreader. KEPUB for Kobo. PDF for ReMarkable or Kindle Scribe 2025.
+  - MOBI for modern Kindles. [CBZ for KF7 Kindles](https://ebooks.stackexchange.com/questions/173/how-to-use-the-e-ink-kindle-readers-to-display-photos) like the Kindle 1/2/3/DX. CBZ for Koreader. KEPUB for Kobo (Kobo profile + EPUB = KEPUB). PDF for ReMarkable or Kindle Scribe 2025.
 - Where is KEPUB option?
   - Choosing a Kobo profile and EPUB output will output KEPUB.
 - All options have additional information in tooltips if you hover over the option.
diff --git a/kindlecomicconverter/KCC_gui.py b/kindlecomicconverter/KCC_gui.py
index f5720f38..96ce65d7 100644
--- a/kindlecomicconverter/KCC_gui.py
+++ b/kindlecomicconverter/KCC_gui.py
@@ -46,7 +46,7 @@ from .KCC_spread_label import LabelSpreadsDialog
 
 from .shared import HTMLStripper, sanitizeTrace, walkLevel
 from .comicarchive import SEVENZIP, TAR, available_archive_tools
-from .comic2ebook import OS_SORT_KEY, flattenTree, getWorkFolder, removeNonImages, sanitizeTree, detectKindleGen
+from .comic2ebook import OS_SORT_KEY, KF7_KINDLES, flattenTree, getWorkFolder, removeNonImages, sanitizeTree, detectKindleGen
 from . import __version__
 from . import comic2ebook
 from . import metadata
@@ -1140,7 +1140,7 @@ class KCCGUI(KCC_ui.Ui_mainWindow):
                 if bad_format in current_format:
                     self.addMessage('Colorsoft MOBI/EPUB can have blank pages. Just go back a few pages, exit, and reenter book.', 'info')
                     break
-        elif profile['Label'] == 'KDX':
+        elif profile['Label'] in KF7_KINDLES:
             GUI.mozJpegBox.setCheckState(Qt.CheckState.PartiallyChecked)
             GUI.borderBox.setCheckState(Qt.CheckState.PartiallyChecked)
             GUI.pngLegacyBox.setChecked(True)
@@ -1539,11 +1539,11 @@ class KCCGUI(KCC_ui.Ui_mainWindow):
                                'DefaultUpscale': True, 'ForceColor': False, 'Label': 'KoL'},
             "Kobo Forma": {'PVOptions': False, 'ForceExpert': False, 'DefaultFormat': 1,
                            'DefaultUpscale': True, 'ForceColor': False, 'Label': 'KoF'},
-            "Kindle 1": {'PVOptions': False, 'ForceExpert': False, 'DefaultFormat': 0,
+            "Kindle 1": {'PVOptions': False, 'ForceExpert': False, 'DefaultFormat': 2,
                          'DefaultUpscale': False, 'ForceColor': False, 'Label': 'K1'},
-            "Kindle 2": {'PVOptions': False, 'ForceExpert': False, 'DefaultFormat': 0,
+            "Kindle 2": {'PVOptions': False, 'ForceExpert': False, 'DefaultFormat': 2,
                          'DefaultUpscale': False, 'ForceColor': False, 'Label': 'K2'},
-            "Kindle Keyboard": {'PVOptions': False, 'ForceExpert': False, 'DefaultFormat': 0,
+            "Kindle Keyboard": {'PVOptions': False, 'ForceExpert': False, 'DefaultFormat': 2,
                                 'DefaultUpscale': False, 'ForceColor': False, 'Label': 'K34'},
             "Kindle Touch": {'PVOptions': False, 'ForceExpert': False, 'DefaultFormat': 0,
                              'DefaultUpscale': False, 'ForceColor': False, 'Label': 'K34'},
diff --git a/kindlecomicconverter/comic2ebook.py b/kindlecomicconverter/comic2ebook.py
index aca6bbd4..4aec575d 100755
--- a/kindlecomicconverter/comic2ebook.py
+++ b/kindlecomicconverter/comic2ebook.py
@@ -62,6 +62,7 @@ from . import __version__
 
 ImageFile.LOAD_TRUNCATED_IMAGES = True
 OS_SORT_KEY = os_sort_keygen()
+KF7_KINDLES = ('K1', 'K2', 'K34', 'KDX')
 
 def main(argv=None):
     global options
@@ -758,7 +759,7 @@ def imgFileProcessing(work):
                     img.quantizeImage()
                 if opt.format == 'PDF':
                     img.convertToGrayscale()
-                elif opt.profile == 'KDX' and opt.format == 'CBZ':
+                elif opt.profile in KF7_KINDLES and opt.format == 'CBZ':
                     img.convertToGrayscale()
                 elif opt.pnglegacy:
                     img.convertToGrayscale()
@@ -1661,7 +1662,7 @@ def checkOptions(options):
         options.skip_zip = True
         options.folder_output = True
     if options.format == 'Auto':
-        if options.profile in ['KDX']:
+        if options.profile in KF7_KINDLES:
             options.format = 'CBZ'
         elif options.profile in image.ProfileData.ProfilesKindle.keys():
             options.format = 'MOBI'
@@ -1678,7 +1679,7 @@ def checkOptions(options):
     if (options.format == 'MOBI' or options.format == 'KFX') and options.batchsplit != 2:
         options.batchsplit = 1
     # Older Kindle models don't support Panel View.
-    if options.profile == 'K1' or options.profile == 'K2' or options.profile == 'K34' or options.profile == 'KDX':
+    if options.profile in KF7_KINDLES:
         options.panelview = False
         options.hq = False
     if not options.hq and not options.autoscale and not options.legacypanelview: