diff --git a/src/library.cr b/src/library.cr
index 193863b..e850173 100644
--- a/src/library.cr
+++ b/src/library.cr
@@ -4,6 +4,8 @@ require "uri"
 require "./util"
 require "./archive"
 
+SUPPORTED_IMG_TYPES = ["image/jpeg", "image/png", "image/webp"]
+
 struct Image
   property data : Bytes
   property mime : String
@@ -27,7 +29,7 @@ class Entry
     @size = (File.size path).humanize_bytes
     file = ArchiveFile.new path
     @pages = file.entries.count do |e|
-      ["image/jpeg", "image/png"].includes? \
+      SUPPORTED_IMG_TYPES.includes? \
         MIME.from_filename? e.filename
     end
     file.close
@@ -72,7 +74,7 @@ class Entry
     ArchiveFile.open @zip_path do |file|
       page = file.entries
         .select { |e|
-          ["image/jpeg", "image/png"].includes? \
+          SUPPORTED_IMG_TYPES.includes? \
             MIME.from_filename? e.filename
         }
         .sort { |a, b|
diff --git a/src/routes/api.cr b/src/routes/api.cr
index 91438e2..4911c1b 100644
--- a/src/routes/api.cr
+++ b/src/routes/api.cr
@@ -224,7 +224,7 @@ class APIRouter < Router
             entry_id = env.params.query["entry"]?
             title = @context.library.get_title(title_id).not_nil!
 
-            unless ["image/jpeg", "image/png"].includes? \
+            unless SUPPORTED_IMG_TYPES.includes? \
                      MIME.from_filename? filename
               raise "The uploaded image must be either JPEG or PNG"
             end
diff --git a/src/views/title.ecr b/src/views/title.ecr
index 803d023..ec201a6 100644
--- a/src/views/title.ecr
+++ b/src/views/title.ecr
@@ -72,7 +72,7 @@
                 <span uk-icon="icon: cloud-upload"></span>
                 <span class="uk-text-middle">Upload a cover image by dropping it here or</span>
                 <div uk-form-custom>
-                  <input type="file" accept="image/jpeg, image/png">
+                  <input type="file" accept="<%= SUPPORTED_IMG_TYPES.join ", " %>">
                   <span class="uk-link">selecting one</span>
                 </div>
               </div>