diff --git a/spec/util_spec.cr b/spec/util_spec.cr
index da2bb66..aa7ad07 100644
--- a/spec/util_spec.cr
+++ b/spec/util_spec.cr
@@ -1,10 +1,10 @@
 require "./spec_helper"
 
-describe "compare_alphanumerically" do
+describe "compare_numerically" do
   it "sorts filenames with leading zeros correctly" do
     ary = ["010.jpg", "001.jpg", "002.png"]
     ary.sort! { |a, b|
-      compare_alphanumerically a, b
+      compare_numerically a, b
     }
     ary.should eq ["001.jpg", "002.png", "010.jpg"]
   end
@@ -12,7 +12,7 @@ describe "compare_alphanumerically" do
   it "sorts filenames without leading zeros correctly" do
     ary = ["10.jpg", "1.jpg", "0.png", "0100.jpg"]
     ary.sort! { |a, b|
-      compare_alphanumerically a, b
+      compare_numerically a, b
     }
     ary.should eq ["0.png", "1.jpg", "10.jpg", "0100.jpg"]
   end
@@ -22,7 +22,7 @@ describe "compare_alphanumerically" do
     ary = ["2", "12", "200000", "1000000", "a", "a12", "b2", "text2",
            "text2a", "text2a2", "text2a12", "text2ab", "text12", "text12a"]
     ary.reverse.sort { |a, b|
-      compare_alphanumerically a, b
+      compare_numerically a, b
     }.should eq ary
   end
 
@@ -30,7 +30,7 @@ describe "compare_alphanumerically" do
   it "handles numbers larger than Int32" do
     ary = ["14410155591588.jpg", "21410155591588.png", "104410155591588.jpg"]
     ary.reverse.sort { |a, b|
-      compare_alphanumerically a, b
+      compare_numerically a, b
     }.should eq ary
   end
 end
diff --git a/src/handlers/auth_handler.cr b/src/handlers/auth_handler.cr
index f66c786..be4f6b1 100644
--- a/src/handlers/auth_handler.cr
+++ b/src/handlers/auth_handler.cr
@@ -1,6 +1,6 @@
 require "kemal"
 require "../storage"
-require "../util"
+require "../util/*"
 
 class AuthHandler < Kemal::Handler
   # Some of the code is copied form kemalcr/kemal-basic-auth on GitHub
diff --git a/src/handlers/static_handler.cr b/src/handlers/static_handler.cr
index adaf3c1..b3a2d0e 100644
--- a/src/handlers/static_handler.cr
+++ b/src/handlers/static_handler.cr
@@ -1,6 +1,6 @@
 require "baked_file_system"
 require "kemal"
-require "../util"
+require "../util/*"
 
 class FS
   extend BakedFileSystem
diff --git a/src/handlers/upload_handler.cr b/src/handlers/upload_handler.cr
index 0846814..d34b820 100644
--- a/src/handlers/upload_handler.cr
+++ b/src/handlers/upload_handler.cr
@@ -1,5 +1,5 @@
 require "kemal"
-require "../util"
+require "../util/*"
 
 class UploadHandler < Kemal::Handler
   def initialize(@upload_dir : String)
diff --git a/src/library.cr b/src/library.cr
index 7bbfc5b..8c0d7fe 100644
--- a/src/library.cr
+++ b/src/library.cr
@@ -1,7 +1,7 @@
 require "mime"
 require "json"
 require "uri"
-require "./util"
+require "./util/*"
 require "./archive"
 
 SUPPORTED_IMG_TYPES = ["image/jpeg", "image/png", "image/webp"]
@@ -87,7 +87,7 @@ class Entry
             MIME.from_filename? e.filename
         }
         .sort { |a, b|
-          compare_alphanumerically a.filename, b.filename
+          compare_numerically a.filename, b.filename
         }
         .[page_num - 1]
       data = file.read_entry page
@@ -236,11 +236,11 @@ class Title
     @mtime = mtimes.max
 
     @title_ids.sort! do |a, b|
-      compare_alphanumerically @library.title_hash[a].title,
+      compare_numerically @library.title_hash[a].title,
         @library.title_hash[b].title
     end
     @entries.sort! do |a, b|
-      compare_alphanumerically a.title, b.title
+      compare_numerically a.title, b.title
     end
   end
 
diff --git a/src/server.cr b/src/server.cr
index 68195f9..1879cfc 100644
--- a/src/server.cr
+++ b/src/server.cr
@@ -2,7 +2,7 @@ require "kemal"
 require "kemal-session"
 require "./library"
 require "./handlers/*"
-require "./util"
+require "./util/*"
 require "./routes/*"
 
 class Context
diff --git a/src/storage.cr b/src/storage.cr
index 0b0f2e0..a9fb144 100644
--- a/src/storage.cr
+++ b/src/storage.cr
@@ -2,7 +2,7 @@ require "sqlite3"
 require "crypto/bcrypt"
 require "uuid"
 require "base64"
-require "./util"
+require "./util/*"
 
 def hash_password(pw)
   Crypto::Bcrypt::Password.create(pw).to_s
diff --git a/src/upload.cr b/src/upload.cr
index 04fe51f..a4facca 100644
--- a/src/upload.cr
+++ b/src/upload.cr
@@ -1,4 +1,4 @@
-require "./util"
+require "./util/*"
 
 class Upload
   def initialize(@dir : String)
diff --git a/src/util.cr b/src/util.cr
deleted file mode 100644
index 6d0d2cc..0000000
--- a/src/util.cr
+++ /dev/null
@@ -1,169 +0,0 @@
-require "big"
-
-IMGS_PER_PAGE     = 5
-UPLOAD_URL_PREFIX = "/uploads"
-STATIC_DIRS       = ["/css", "/js", "/img", "/favicon.ico"]
-
-def requesting_static_file(env)
-  request_path_startswith env, STATIC_DIRS
-end
-
-macro layout(name)
-  base_url = Config.current.base_url
-  begin
-    is_admin = false
-    if token = env.session.string? "token"
-      is_admin = @context.storage.verify_admin token
-    end
-    page = {{name}}
-    render "src/views/#{{{name}}}.html.ecr", "src/views/layout.html.ecr"
-  rescue e
-    message = e.to_s
-    @context.error message
-    render "src/views/message.html.ecr", "src/views/layout.html.ecr"
-  end
-end
-
-macro send_img(env, img)
-  send_file {{env}}, {{img}}.data, {{img}}.mime
-end
-
-macro get_username(env)
-  # if the request gets here, it has gone through the auth handler, and
-  #   we can be sure that a valid token exists, so we can use not_nil! here
-  token = env.session.string "token"
-  (@context.storage.verify_token token).not_nil!
-end
-
-def send_json(env, json)
-  env.response.content_type = "application/json"
-  env.response.print json
-end
-
-def send_attachment(env, path)
-  send_file env, path, filename: File.basename(path), disposition: "attachment"
-end
-
-def hash_to_query(hash)
-  hash.map { |k, v| "#{k}=#{v}" }.join("&")
-end
-
-def request_path_startswith(env, ary)
-  ary.each do |prefix|
-    if env.request.path.starts_with? prefix
-      return true
-    end
-  end
-  false
-end
-
-def is_numeric(str)
-  /^\d+/.match(str) != nil
-end
-
-def split_by_alphanumeric(str)
-  arr = [] of String
-  str.scan(/([^\d\n\r]*)(\d*)([^\d\n\r]*)/) do |match|
-    arr += match.captures.select { |s| s != "" }
-  end
-  arr
-end
-
-def compare_alphanumerically(c, d)
-  is_c_bigger = c.size <=> d.size
-  if c.size > d.size
-    d += [nil] * (c.size - d.size)
-  elsif c.size < d.size
-    c += [nil] * (d.size - c.size)
-  end
-  c.zip(d) do |a, b|
-    return -1 if a.nil?
-    return 1 if b.nil?
-    if is_numeric(a) && is_numeric(b)
-      compare = a.to_big_i <=> b.to_big_i
-      return compare if compare != 0
-    else
-      compare = a <=> b
-      return compare if compare != 0
-    end
-  end
-  is_c_bigger
-end
-
-def compare_alphanumerically(a : String, b : String)
-  compare_alphanumerically split_by_alphanumeric(a), split_by_alphanumeric(b)
-end
-
-def validate_archive(path : String) : Exception?
-  file = nil
-  begin
-    file = ArchiveFile.new path
-    file.check
-    file.close
-    return
-  rescue e
-    file.close unless file.nil?
-    e
-  end
-end
-
-def random_str
-  UUID.random.to_s.gsub "-", ""
-end
-
-def redirect(env, path)
-  base = Config.current.base_url
-  env.redirect File.join base, path
-end
-
-def validate_username(username)
-  if username.size < 3
-    raise "Username should contain at least 3 characters"
-  end
-  if (username =~ /^[A-Za-z0-9_]+$/).nil?
-    raise "Username should contain alphanumeric characters " \
-          "and underscores only"
-  end
-end
-
-def validate_password(password)
-  if password.size < 6
-    raise "Password should contain at least 6 characters"
-  end
-  if (password =~ /^[[:ascii:]]+$/).nil?
-    raise "password should contain ASCII characters only"
-  end
-end
-
-macro render_xml(path)
-  base_url = Config.current.base_url
-  send_file env, ECR.render({{path}}).to_slice, "application/xml"
-end
-
-macro render_component(filename)
-  render "src/views/components/#{{{filename}}}.html.ecr"
-end
-
-# Works in all Unix systems. Follows https://github.com/crystal-lang/crystal/
-#   blob/master/src/crystal/system/unix/file_info.cr#L42-L48
-def ctime(file_path : String) : Time
-  res = LibC.stat(file_path, out stat)
-  raise "Unable to get ctime of file #{file_path}" if res != 0
-
-  {% if flag?(:darwin) %}
-    Time.new stat.st_ctimespec, Time::Location::UTC
-  {% else %}
-    Time.new stat.st_ctim, Time::Location::UTC
-  {% end %}
-end
-
-def register_mime_types
-  {
-    ".zip" => "application/zip",
-    ".rar" => "application/x-rar-compressed",
-    ".cbz" => "application/vnd.comicbook+zip",
-    ".cbr" => "application/vnd.comicbook-rar",
-  }.each do |k, v|
-    MIME.register k, v
-  end
-end
diff --git a/src/util/numeric_sort.cr b/src/util/numeric_sort.cr
new file mode 100644
index 0000000..81279a4
--- /dev/null
+++ b/src/util/numeric_sort.cr
@@ -0,0 +1,40 @@
+# Properly sort alphanumeric strings
+# Used to sort the images files inside the archives
+# https://github.com/hkalexling/Mango/issues/12
+
+def is_numeric(str)
+  /^\d+/.match(str) != nil
+end
+
+def split_by_alphanumeric(str)
+  arr = [] of String
+  str.scan(/([^\d\n\r]*)(\d*)([^\d\n\r]*)/) do |match|
+    arr += match.captures.select { |s| s != "" }
+  end
+  arr
+end
+
+def compare_numerically(c, d)
+  is_c_bigger = c.size <=> d.size
+  if c.size > d.size
+    d += [nil] * (c.size - d.size)
+  elsif c.size < d.size
+    c += [nil] * (d.size - c.size)
+  end
+  c.zip(d) do |a, b|
+    return -1 if a.nil?
+    return 1 if b.nil?
+    if is_numeric(a) && is_numeric(b)
+      compare = a.to_big_i <=> b.to_big_i
+      return compare if compare != 0
+    else
+      compare = a <=> b
+      return compare if compare != 0
+    end
+  end
+  is_c_bigger
+end
+
+def compare_numerically(a : String, b : String)
+  compare_numerically split_by_alphanumeric(a), split_by_alphanumeric(b)
+end
diff --git a/src/util/util.cr b/src/util/util.cr
new file mode 100644
index 0000000..3064885
--- /dev/null
+++ b/src/util/util.cr
@@ -0,0 +1,33 @@
+require "big"
+
+IMGS_PER_PAGE     = 5
+UPLOAD_URL_PREFIX = "/uploads"
+STATIC_DIRS       = ["/css", "/js", "/img", "/favicon.ico"]
+
+def random_str
+  UUID.random.to_s.gsub "-", ""
+end
+
+# Works in all Unix systems. Follows https://github.com/crystal-lang/crystal/
+#   blob/master/src/crystal/system/unix/file_info.cr#L42-L48
+def ctime(file_path : String) : Time
+  res = LibC.stat(file_path, out stat)
+  raise "Unable to get ctime of file #{file_path}" if res != 0
+
+  {% if flag?(:darwin) %}
+    Time.new stat.st_ctimespec, Time::Location::UTC
+  {% else %}
+    Time.new stat.st_ctim, Time::Location::UTC
+  {% end %}
+end
+
+def register_mime_types
+  {
+    ".zip" => "application/zip",
+    ".rar" => "application/x-rar-compressed",
+    ".cbz" => "application/vnd.comicbook+zip",
+    ".cbr" => "application/vnd.comicbook-rar",
+  }.each do |k, v|
+    MIME.register k, v
+  end
+end
diff --git a/src/util/validation.cr b/src/util/validation.cr
new file mode 100644
index 0000000..6141900
--- /dev/null
+++ b/src/util/validation.cr
@@ -0,0 +1,31 @@
+def validate_username(username)
+  if username.size < 3
+    raise "Username should contain at least 3 characters"
+  end
+  if (username =~ /^[A-Za-z0-9_]+$/).nil?
+    raise "Username should contain alphanumeric characters " \
+          "and underscores only"
+  end
+end
+
+def validate_password(password)
+  if password.size < 6
+    raise "Password should contain at least 6 characters"
+  end
+  if (password =~ /^[[:ascii:]]+$/).nil?
+    raise "password should contain ASCII characters only"
+  end
+end
+
+def validate_archive(path : String) : Exception?
+  file = nil
+  begin
+    file = ArchiveFile.new path
+    file.check
+    file.close
+    return
+  rescue e
+    file.close unless file.nil?
+    e
+  end
+end
diff --git a/src/util/web.cr b/src/util/web.cr
new file mode 100644
index 0000000..93efebd
--- /dev/null
+++ b/src/util/web.cr
@@ -0,0 +1,68 @@
+# Web related helper functions/macros
+
+macro layout(name)
+  base_url = Config.current.base_url
+  begin
+    is_admin = false
+    if token = env.session.string? "token"
+      is_admin = @context.storage.verify_admin token
+    end
+    page = {{name}}
+    render "src/views/#{{{name}}}.html.ecr", "src/views/layout.html.ecr"
+  rescue e
+    message = e.to_s
+    @context.error message
+    render "src/views/message.html.ecr", "src/views/layout.html.ecr"
+  end
+end
+
+macro send_img(env, img)
+  send_file {{env}}, {{img}}.data, {{img}}.mime
+end
+
+macro get_username(env)
+  # if the request gets here, it has gone through the auth handler, and
+  #   we can be sure that a valid token exists, so we can use not_nil! here
+  token = env.session.string "token"
+  (@context.storage.verify_token token).not_nil!
+end
+
+def send_json(env, json)
+  env.response.content_type = "application/json"
+  env.response.print json
+end
+
+def send_attachment(env, path)
+  send_file env, path, filename: File.basename(path), disposition: "attachment"
+end
+
+def redirect(env, path)
+  base = Config.current.base_url
+  env.redirect File.join base, path
+end
+
+def hash_to_query(hash)
+  hash.map { |k, v| "#{k}=#{v}" }.join("&")
+end
+
+def request_path_startswith(env, ary)
+  ary.each do |prefix|
+    if env.request.path.starts_with? prefix
+      return true
+    end
+  end
+  false
+end
+
+def requesting_static_file(env)
+  request_path_startswith env, STATIC_DIRS
+end
+
+macro render_xml(path)
+  base_url = Config.current.base_url
+  send_file env, ECR.render({{path}}).to_slice, "application/xml"
+end
+
+macro render_component(filename)
+  render "src/views/components/#{{{filename}}}.html.ecr"
+end