diff --git a/app/views/posts/attributes/_image.haml b/app/views/posts/attributes/_image.haml
index f4d9bb3d..84fe56fd 100644
--- a/app/views/posts/attributes/_image.haml
+++ b/app/views/posts/attributes/_image.haml
@@ -22,7 +22,7 @@
     = file_field(*field_name_for(base, attribute, :path),
       **field_options(attribute, metadata, required: (metadata.required && !metadata.path?)),
       class: "custom-file-input #{invalid(post, attribute)}",
-      accept: 'image/*', data: { preview: "#{attribute}-preview" })
+      accept: ActiveStorage.web_image_content_types.join(','), data: { preview: "#{attribute}-preview" })
     = label_tag "#{base}_#{attribute}_path",
       post_label_t(attribute, :path, post: post), class: 'custom-file-label'
     = render 'posts/attribute_feedback',
diff --git a/config/application.rb b/config/application.rb
index 97ab244c..941caa68 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -37,6 +37,7 @@ module Sutty
           .rescue_responses['Pundit::NotAuthorizedError'] = :forbidden
 
     config.active_storage.variant_processor = :vips
+    config.active_storage.web_image_content_types << 'image/webp'
 
     config.to_prepare do
       # Load application's model / class decorators
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 3f7dd1f1..907970d5 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -52,7 +52,7 @@ en:
     cant_be_empty: 'This field cannot be empty'
     image:
       site_invalid: 'The image cannot be stored if the site configuration is not valid'
-      not_an_image: 'Not an image'
+      not_an_image: 'Not a web image.  Accepted formats: PNG, JPEG, GIF, WEBP'
       path_required: 'Missing image for upload'
       no_file_for_description: "Description with no associated image"
       attachment_missing: "I couldn't save the image :("
diff --git a/config/locales/es.yml b/config/locales/es.yml
index 90def099..2fc77c5f 100644
--- a/config/locales/es.yml
+++ b/config/locales/es.yml
@@ -52,7 +52,7 @@ es:
     cant_be_empty: 'El campo no puede estar vacío'
     image:
       site_invalid: 'La imagen no se puede almacenar si la configuración del sitio no es válida'
-      not_an_image: 'No es una imagen'
+      not_an_image: 'No es una imagen en formato web.  Formatos aceptados: PNG, JPEG, GIF, WEBP'
       path_required: 'Se necesita una imagen'
       no_file_for_description: 'Se envió una descripción sin imagen asociada'
       attachment_missing: 'no pude guardar el archivo :('