diff --git a/app/javascript/src/javascripts/post_mode_menu.js b/app/javascript/src/javascripts/post_mode_menu.js
index d1f3fa871..2a518f62f 100644
--- a/app/javascript/src/javascripts/post_mode_menu.js
+++ b/app/javascript/src/javascripts/post_mode_menu.js
@@ -124,12 +124,6 @@ PostModeMenu.open_edit = function(post_id) {
   $("#quick-edit-div").slideDown("fast");
   $("#quick-edit-form").attr("data-post-id", post_id);
   $("#post_tag_string").val($post.data("tags") + " ").focus().selectEnd();
-
-  /* Set height of tag edit box to fit content. */
-  $("#post_tag_string").height(80); // min height: 80px.
-  var padding = $("#post_tag_string").innerHeight() - $("#post_tag_string").height();
-  var height = $("#post_tag_string").prop("scrollHeight") - padding;
-  $("#post_tag_string").height(height);
 }
 
 PostModeMenu.click = function(e) {
diff --git a/app/javascript/src/styles/common/simple_form.scss b/app/javascript/src/styles/common/simple_form.scss
index 338f316f4..6f2ed942c 100644
--- a/app/javascript/src/styles/common/simple_form.scss
+++ b/app/javascript/src/styles/common/simple_form.scss
@@ -31,12 +31,17 @@ form.simple_form {
     margin-bottom: 1em;
 
     input[type=text], input[type=file], input[type=password], input[type=email] {
-      max-width: 20em;
+      width: 100%;
+      max-width: 25em;
     }
 
     .hint {
       @extend .fineprint;
       padding-left: 1em;
+
+      @media (max-width: 660px) {
+        display: none;
+      }
     }
 
     input.validation-error {
@@ -48,10 +53,20 @@ form.simple_form {
         padding-left: 0;
         display: block;
       }
+
+      textarea {
+        width: 100%;
+        max-width: 60rem;
+        max-height: 15rem;
+
+        &.text  { height: 20vh; }
+        &.dtext { height: 40vh; }
+      }
     }
 
-    textarea {
-      width: 70%;
+    select[multiple] {
+      height: 20vh;
+      max-height: 15rem;
     }
 
     label {
@@ -80,6 +95,7 @@ form.simple_form {
 
 form.inline-form {
   display: table;
+  width: 100%;
 
   > div.input {
     display: table-row;
@@ -87,12 +103,13 @@ form.inline-form {
 
     label {
       text-align: right;
+      padding-right: 1em;
+      white-space: nowrap;
+      width: 1%;
     }
 
     label, input {
       display: table-cell;
-      padding-right: 1em;
-      white-space: nowrap;
       line-height: 1em;
     }
   }
diff --git a/app/javascript/src/styles/specific/posts.scss b/app/javascript/src/styles/specific/posts.scss
index 56e651cef..82fc193c1 100644
--- a/app/javascript/src/styles/specific/posts.scss
+++ b/app/javascript/src/styles/specific/posts.scss
@@ -155,10 +155,6 @@ div#c-posts {
       margin: 1em 0 0.5em;
     }
 
-    #edit textarea {
-      width: 100%;
-    }
-
     #favlist {
       word-wrap: break-word;
     }
@@ -188,14 +184,6 @@ div#c-posts {
       }
     }
   }
-
-  div#quick-edit-div {
-    textarea {
-      width: 70%;
-      height: 4em;
-      display: block;
-    }
-  }
 }
 
 body[data-post-current-image-size="large"] #post-options .image-view-large-link,
@@ -253,6 +241,8 @@ div#c-posts, div#c-uploads {
 
 /* Container for the tag edit <textarea>, header, and related tags buttons. */
 #tags-container {
+  max-width: 60rem;
+
   div.header {
     line-height: 1.5em;
 
@@ -277,18 +267,3 @@ div#c-posts, div#c-uploads {
     }
   }
 }
-
-#add-commentary-dialog {
-  input {
-    width: 70%;
-  }
-
-  input[type=checkbox] {
-    width: auto;
-  }
-
-  textarea {
-    font-size: 1em;
-    width: 100%;
-  }
-}
diff --git a/app/logical/dtext_input.rb b/app/logical/dtext_input.rb
index 77e55621a..687e99eef 100644
--- a/app/logical/dtext_input.rb
+++ b/app/logical/dtext_input.rb
@@ -20,7 +20,7 @@ class DtextInput < SimpleForm::Inputs::Base
       if options[:inline]
         t.concat @builder.text_field(attribute_name, merged_input_options)
       else
-        t.concat @builder.text_area(attribute_name, { rows: 20, cols: 30 }.merge(merged_input_options))
+        t.concat @builder.text_area(attribute_name, merged_input_options)
       end
 
       t.concat t.tag.div(id: "dtext-preview", class: "dtext-preview prose")
diff --git a/app/views/api_keys/_form.html.erb b/app/views/api_keys/_form.html.erb
index ec83e54c4..739a2b2d8 100644
--- a/app/views/api_keys/_form.html.erb
+++ b/app/views/api_keys/_form.html.erb
@@ -1,6 +1,6 @@
 <%= edit_form_for(api_key, html: { class: "stacked-hints" }) do |f| %>
   <%= f.input :name, as: :string, hint: "An optional name to help you remember what this key is for." %>
   <%= f.input :permitted_ip_addresses, label: "IP Addresses", as: :string, hint: "An optional list of IPs allowed to use this key. Leave blank to allow all IPs." %>
-  <%= f.input :permissions, as: :select, collection: ApiKey.permissions_list, hint: "An optional list of API endpoints this key can use. Ctrl+click to select multiple endpoints. Leave blank to allow all API endpoints.", input_html: { multiple: true, size: 10 } %>
+  <%= f.input :permissions, as: :select, collection: ApiKey.permissions_list, hint: "An optional list of API endpoints this key can use. Ctrl+click to select multiple endpoints. Leave blank to allow all API endpoints.", input_html: { multiple: true } %>
   <%= f.submit "Create" %>
 <% end %>
diff --git a/app/views/artist_commentaries/_form.html.erb b/app/views/artist_commentaries/_form.html.erb
index d5481f471..4e11f0d31 100644
--- a/app/views/artist_commentaries/_form.html.erb
+++ b/app/views/artist_commentaries/_form.html.erb
@@ -14,10 +14,10 @@
   <%= f.input :post_id, as: :hidden, input_html: { value: post.id } %>
 
   <%= f.input :original_title, as: :string, input_html: { value: artist_commentary.try(:original_title) } %>
-  <%= f.input :original_description, input_html: { size: "40x6", value: artist_commentary.try(:original_description) } %>
+  <%= f.input :original_description, input_html: { value: artist_commentary.try(:original_description) } %>
 
   <%= f.input :translated_title, as: :string, input_html: { value: artist_commentary.try(:translated_title) } %>
-  <%= f.input :translated_description, input_html: { size: "40x6", value: artist_commentary.try(:translated_description) } %>
+  <%= f.input :translated_description, input_html: { value: artist_commentary.try(:translated_description) } %>
 
   <% if post.has_tag?("commentary") %>
     <%= f.input :remove_commentary_tag, as: :boolean %>
diff --git a/app/views/artists/_form.html.erb b/app/views/artists/_form.html.erb
index d4a200708..8a72d56fb 100644
--- a/app/views/artists/_form.html.erb
+++ b/app/views/artists/_form.html.erb
@@ -1,9 +1,9 @@
 <%= edit_form_for(@artist) do |f| %>
   <%= f.input :name, as: :string, input_html: { "data-autocomplete": "tag" } %>
 
-  <%= f.input :other_names_string, label: "Other names", as: :text, input_html: { size: "50x1" }, hint: '<b style="color: red;">NEW</b> Separate names with spaces, not commas. Use underscores for spaces inside names.'.html_safe %>
+  <%= f.input :other_names_string, label: "Other names", as: :string, hint: "Separate names with spaces, not commas. Use underscores for spaces inside names." %>
   <%= f.input :group_name %>
-  <%= f.input :url_string, :label => "URLs", :as => :text, :input_html => {:size => "50x15", :value => params.dig(:artist, :url_string) || @artist.urls.join("\n")}, :hint => "You can prefix a URL with - to mark it as dead." %>
+  <%= f.input :url_string, label: "URLs", as: :text, input_html: { value: params.dig(:artist, :url_string) || @artist.urls.join("\n")}, hint: "You can prefix a URL with - to mark it as dead." %>
 
   <% if @artist.wiki_page.present? %>
     <div class="input">
diff --git a/app/views/bulk_update_requests/_form.html.erb b/app/views/bulk_update_requests/_form.html.erb
index 41cef73d0..b54170eae 100644
--- a/app/views/bulk_update_requests/_form.html.erb
+++ b/app/views/bulk_update_requests/_form.html.erb
@@ -20,7 +20,7 @@
     <% end %>
   </p>
 
-  <%= f.input :script, label: "Request", as: :text, placeholder: bur_script_example, input_html: { size: "50x15" } %>
+  <%= f.input :script, label: "Request", as: :text, placeholder: bur_script_example %>
 
   <% if @bulk_update_request.new_record? %>
     <div class="input">
diff --git a/app/views/news_updates/edit.html.erb b/app/views/news_updates/edit.html.erb
index 8f9819322..a54ce0c04 100644
--- a/app/views/news_updates/edit.html.erb
+++ b/app/views/news_updates/edit.html.erb
@@ -3,7 +3,7 @@
     <h1>Edit Update</h1>
 
     <%= edit_form_for(@news_update) do |f| %>
-      <%= f.input :message, :hint => "Use HTML for formatting", :input_html => {:size => "30x5"} %>
+      <%= f.input :message, hint: "Use HTML for formatting" %>
       <%= f.button :submit, "Submit" %>
     <% end %>
   </div>
diff --git a/app/views/news_updates/new.html.erb b/app/views/news_updates/new.html.erb
index b0f0e64de..d3303fe4e 100644
--- a/app/views/news_updates/new.html.erb
+++ b/app/views/news_updates/new.html.erb
@@ -3,7 +3,7 @@
     <h1>New Update</h1>
 
     <%= edit_form_for(@news_update) do |f| %>
-      <%= f.input :message, :hint => "Use HTML for formatting", :input_html => {:size => "30x5"} %>
+      <%= f.input :message, hint: "Use HTML for formatting" %>
       <%= f.button :submit, "Submit" %>
     <% end %>
   </div>
diff --git a/app/views/pool_elements/_new.html.erb b/app/views/pool_elements/_new.html.erb
index 59a355121..a90a72bfe 100644
--- a/app/views/pool_elements/_new.html.erb
+++ b/app/views/pool_elements/_new.html.erb
@@ -3,7 +3,7 @@
 
   <div class="input">
     <label>Pool Name</label>
-    <span id="pool-name-container"><%= text_field_tag "pool_name", "", :size => 20, :data => { autocomplete: "pool" } %></span>
+    <span id="pool-name-container"><%= text_field_tag "pool_name", "", :data => { autocomplete: "pool" } %></span>
   </div>
 
   <div class="input">
diff --git a/app/views/posts/partials/show/_edit.html.erb b/app/views/posts/partials/show/_edit.html.erb
index 2c99860dc..787bdd27e 100644
--- a/app/views/posts/partials/show/_edit.html.erb
+++ b/app/views/posts/partials/show/_edit.html.erb
@@ -42,8 +42,8 @@
     </fieldset>
   <% end %>
 
-  <%= f.input :parent_id, label: "Parent", input_html: { size: 60 }, as: :string %>
-  <%= f.input :source, input_html: { size: 60 } %>
+  <%= f.input :parent_id, label: "Parent", as: :string %>
+  <%= f.input :source %>
 
   <div class="input fixed-width-container" id="tags-container">
     <div class="header">
@@ -59,7 +59,7 @@
     </div>
 
     <div>
-      <%= f.input :tag_string, label: false, hint: "Ctrl+Enter to submit", input_html: { size: "60x5", "data-autocomplete": "tag-edit", "data-shortcut": "e", value: post.presenter.split_tag_list_text + " " } %>
+      <%= f.input :tag_string, label: false, hint: "Ctrl+Enter to submit", input_html: { "data-autocomplete": "tag-edit", "data-shortcut": "e", value: post.presenter.split_tag_list_text + " " } %>
     </div>
 
     <%= render "related_tags/buttons" %>
diff --git a/app/views/uploads/new.html.erb b/app/views/uploads/new.html.erb
index 1ac675c6a..1e3b34dd4 100644
--- a/app/views/uploads/new.html.erb
+++ b/app/views/uploads/new.html.erb
@@ -35,7 +35,7 @@
         </div>
 
         <div class="upload_source_container">
-          <%= f.input :source, as: :string, placeholder: "Enter the URL to upload here", input_html: { size: 50, value: params[:url] } %>
+          <%= f.input :source, as: :string, placeholder: "Enter the URL to upload here", input_html: { value: params[:url] } %>
           <%= tag.button "Similar", id: "similar-button" %>
         </div>
 
@@ -48,8 +48,8 @@
           <a href="#" id="toggle-artist-commentary">show »</a>
 
           <div class="artist-commentary" style="display: none;">
-            <%= f.input :artist_commentary_title, as: :string, label: "Original Title", input_html: { size: 60, value: params[:artist_commentary_title] } %>
-            <%= f.input :artist_commentary_desc, as: :text, label: "Original Description", input_html: { size: "60x5", value: params[:artist_commentary_desc] } %>
+            <%= f.input :artist_commentary_title, as: :string, label: "Original Title", input_html: { value: params[:artist_commentary_title] } %>
+            <%= f.input :artist_commentary_desc, as: :text, label: "Original Description", input_html: { value: params[:artist_commentary_desc] } %>
           </div>
         </div>
 
@@ -58,8 +58,8 @@
           <a href="#" id="toggle-commentary-translation">show »</a>
 
           <div class="commentary-translation" style="display: none;">
-            <%= f.input :translated_commentary_title, as: :string, label: "Translated Title", input_html: { size: 60, value: params[:translated_commentary_title] } %>
-            <%= f.input :translated_commentary_desc, as: :text, label: "Translated Description", input_html: { size: "60x5", value: params[:translated_commentary_desc] } %>
+            <%= f.input :translated_commentary_title, as: :string, label: "Translated Title", input_html: { value: params[:translated_commentary_title] } %>
+            <%= f.input :translated_commentary_desc, as: :text, label: "Translated Description", input_html: { value: params[:translated_commentary_desc] } %>
           </div>
         </div>
 
@@ -76,7 +76,7 @@
             </a>
           </div>
 
-          <%= f.input :tag_string, label: false, hint: "Ctrl+Enter to submit", input_html: { size: "60x5", "data-autocomplete": "tag-edit", "data-shortcut": "e", value: params[:tag_string] } %>
+          <%= f.input :tag_string, label: false, hint: "Ctrl+Enter to submit", input_html: { "data-autocomplete": "tag-edit", "data-shortcut": "e", value: params[:tag_string] } %>
           <%= render "related_tags/buttons" %>
         </div>
 
diff --git a/app/views/users/edit.html.erb b/app/views/users/edit.html.erb
index 3915d25ad..557927ea3 100644
--- a/app/views/users/edit.html.erb
+++ b/app/views/users/edit.html.erb
@@ -46,7 +46,7 @@
         <%= f.input :receive_email_notifications, as: :select, include_blank: false, collection: [["Yes", "true"], ["No", "false"]], hint: "Receive an email when you receive a new dmail." %>
         <%= f.input :time_zone, include_blank: false, hint: "The timezone to use for timestamps." %>
         <%= f.input :comment_threshold, hint: "Comments at or below this score will be hidden by default.", input_html: { min: -100, max: 5 } %>
-        <%= f.input :blacklisted_tags, hint: "Posts with these tags will be hidden. Put each tag on a separate line. <a href='/wiki_pages/help:blacklists'>View help.</a>".html_safe, :input_html => {:size => "40x5", :data => {:autocomplete => "tag-query"}} %>
+        <%= f.input :blacklisted_tags, hint: "Posts with these tags will be hidden. Put each tag on a separate line. <a href='/wiki_pages/help:blacklists'>View help.</a>".html_safe, :input_html => { :data => {:autocomplete => "tag-query"}} %>
       </fieldset>
 
       <fieldset id="advanced-settings-section">
@@ -70,8 +70,8 @@
         <%= f.input :disable_cropped_thumbnails, :as => :select, :hint => "Disable cropped (square) thumbnails on mobile", :collection => [["No", "false"], ["Yes", "true"]], :include_blank => false %>
         <%= f.input :enable_desktop_mode, :as => :select, :collection => [["No", "false"], ["Yes", "true"]], :include_blank => false, :hint => "Use the desktop layout on mobile" %>
 
-        <%= f.input :favorite_tags, :label => "Frequent tags", :hint => "A list of tags that you use often. They will appear when using the list of Related Tags.", :input_html => { :rows => 5, :data => { :autocomplete => "tag-query" } } %>
-        <%= f.input :custom_style, :label => "Custom <a href='https://en.wikipedia.org/wiki/Cascading_Style_Sheets'>CSS</a> style".html_safe, :hint => "CSS rules to apply to the whole site.", :input_html => {:size => "40x5"} %>
+        <%= f.input :favorite_tags, :label => "Frequent tags", :hint => "A list of tags that you use often. They will appear when using the list of Related Tags.", :input_html => { :data => { :autocomplete => "tag-query" } } %>
+        <%= f.input :custom_style, :label => "Custom <a href='https://en.wikipedia.org/wiki/Cascading_Style_Sheets'>CSS</a> style".html_safe, :hint => "CSS rules to apply to the whole site." %>
       </fieldset>
 
       <%= f.button :submit, "Submit" %>
diff --git a/app/views/wiki_pages/_form.html.erb b/app/views/wiki_pages/_form.html.erb
index 2ff231fd8..5db3146bd 100644
--- a/app/views/wiki_pages/_form.html.erb
+++ b/app/views/wiki_pages/_form.html.erb
@@ -5,7 +5,7 @@
     <%= f.input :title, error: false, input_html: { data: { autocomplete: "tag" } }, hint: "Change to rename this wiki page. Update any wikis linking to this page first." %>
 
     <% if !@wiki_page.tag&.artist? || @wiki_page.other_names.present? %>
-      <%= f.input :other_names_string, as: :text, input_html: { size: "30x1" }, label: "Other names (#{link_to_wiki "help", "help:translated_tags"})".html_safe, hint: "Names used for this tag on other sites such as Pixiv. Separate with spaces." %>
+      <%= f.input :other_names_string, as: :string, label: "Other names (#{link_to_wiki "help", "help:translated_tags"})".html_safe, hint: "Names used for this tag on other sites such as Pixiv. Separate with spaces." %>
     <% end %>
 
     <%= f.input :body, as: :dtext %>
diff --git a/app/views/wiki_pages/new.html.erb b/app/views/wiki_pages/new.html.erb
index aa796d340..a212649b3 100644
--- a/app/views/wiki_pages/new.html.erb
+++ b/app/views/wiki_pages/new.html.erb
@@ -13,7 +13,7 @@
 
   <%= edit_form_for(@wiki_page) do |f| %>
     <%= f.input :title, error: false, input_html: { data: { autocomplete: "tag" } } %>
-    <%= f.input :other_names_string, as: :text, input_html: { size: "30x1" }, label: "Other names (#{link_to_wiki "help", "help:translated_tags"})".html_safe, hint: "Names used for this tag on other sites such as Pixiv. Separate with spaces." %>
+    <%= f.input :other_names_string, as: :string, label: "Other names (#{link_to_wiki "help", "help:translated_tags"})".html_safe, hint: "Names used for this tag on other sites such as Pixiv. Separate with spaces." %>
     <%= f.input :body, as: :dtext %>
     <%= f.submit "Submit" %>
     <%= dtext_preview_button "wiki_page_body" %>