diff --git a/app/models/brochure.rb b/app/models/brochure.rb
index 2efc3035..b60dee60 100644
--- a/app/models/brochure.rb
+++ b/app/models/brochure.rb
@@ -12,4 +12,6 @@ class Brochure < ApplicationRecord
 
   has_one_attached :image, dependent: :destroy
   has_one_attached :pdf, dependent: :destroy
+  validates :image, presence: false,
+                    blob: { content_type: Imageable::ALLOWED_IMAGE_TYPES, size_range: Imageable::IMAGE_SIZE_RANGE }
 end
diff --git a/app/models/catalog.rb b/app/models/catalog.rb
index 9fa5977f..a623e2dc 100644
--- a/app/models/catalog.rb
+++ b/app/models/catalog.rb
@@ -14,6 +14,8 @@ class Catalog < ApplicationRecord
   has_many :books, primary_key: :code, class_name: "Book", dependent: :nullify
   has_one_attached :pdf, dependent: :destroy
   has_one_attached :image, dependent: :destroy
+  validates :image, presence: false,
+                    blob: { content_type: Imageable::ALLOWED_IMAGE_TYPES, size_range: Imageable::IMAGE_SIZE_RANGE }
 
   def set_title
     if code.present?
diff --git a/app/models/concerns/imageable.rb b/app/models/concerns/imageable.rb
index 9241c2bc..f5120d1c 100644
--- a/app/models/concerns/imageable.rb
+++ b/app/models/concerns/imageable.rb
@@ -3,6 +3,9 @@
 module Imageable
   extend ActiveSupport::Concern
 
+  ALLOWED_IMAGE_TYPES = %w[image/png image/jpg image/jpeg image/gif].freeze
+  IMAGE_SIZE_RANGE = 1..5.megabytes
+
   def thumb_image(image_field)
     custom_image(image_field, 160, 220)
   end
diff --git a/app/models/event.rb b/app/models/event.rb
index cd0a04c5..efbb8112 100644
--- a/app/models/event.rb
+++ b/app/models/event.rb
@@ -5,6 +5,8 @@ class Event < ApplicationRecord
   include Imageable
 
   validates :title, :start_date, :end_date, presence: true
+  validates :image, presence: false,
+                    blob: { content_type: Imageable::ALLOWED_IMAGE_TYPES, size_range: Imageable::IMAGE_SIZE_RANGE }
 
   has_rich_text :description
   has_rich_text :news_text
diff --git a/app/models/highlight.rb b/app/models/highlight.rb
index 4f5aaa56..8cc2eb50 100644
--- a/app/models/highlight.rb
+++ b/app/models/highlight.rb
@@ -5,6 +5,8 @@ class Highlight < ApplicationRecord
   include Friendable
 
   validates :title, :image, :link, :alt_text, presence: true
+  validates :image, presence: false,
+                    blob: { content_type: Imageable::ALLOWED_IMAGE_TYPES, size_range: Imageable::IMAGE_SIZE_RANGE }
 
   has_one_attached :image
 end
diff --git a/app/models/news_item.rb b/app/models/news_item.rb
index a30bb042..d7d16279 100644
--- a/app/models/news_item.rb
+++ b/app/models/news_item.rb
@@ -5,6 +5,8 @@ class NewsItem < ApplicationRecord
   include Friendable
 
   validates :title, :image, presence: true
+  validates :image, presence: false,
+                    blob: { content_type: Imageable::ALLOWED_IMAGE_TYPES, size_range: Imageable::IMAGE_SIZE_RANGE }
 
   has_one_attached :image
   has_rich_text :description