diff --git a/README.md b/README.md
index d5c0483..7df0674 100644
--- a/README.md
+++ b/README.md
@@ -77,7 +77,7 @@ $ go install github.com/celogeek/go-comic-converter/v2@v2.6.9
 
 The supported image files are jpeg and png from the sources.
 
-The extensions can be: `jpg`, `jpeg`, `png`, `webp`.
+The extensions can be: `jpg`, `jpeg`, `png`, `webp`, `tiff`.
 
 The case for extensions doesn't matter.
 
diff --git a/internal/epub/imageprocessor/epub_image_processor_loader.go b/internal/epub/imageprocessor/epub_image_processor_loader.go
index da610f0..c77241d 100644
--- a/internal/epub/imageprocessor/epub_image_processor_loader.go
+++ b/internal/epub/imageprocessor/epub_image_processor_loader.go
@@ -18,6 +18,7 @@ import (
 	"sync"
 
 	"golang.org/x/image/font/gofont/gomonobold"
+	_ "golang.org/x/image/tiff"
 	_ "golang.org/x/image/webp"
 
 	"github.com/fogleman/gg"
@@ -43,7 +44,7 @@ var errNoImagesFound = errors.New("no images found")
 // only accept jpg, png and webp as source file
 func (e *EPUBImageProcessor) isSupportedImage(path string) bool {
 	switch strings.ToLower(filepath.Ext(path)) {
-	case ".jpg", ".jpeg", ".png", ".webp":
+	case ".jpg", ".jpeg", ".png", ".webp", ".tiff":
 		{
 			return true
 		}