diff --git a/app/assets/stylesheets/application.scss b/app/assets/stylesheets/application.scss
index 0a215c4..1f9b634 100644
--- a/app/assets/stylesheets/application.scss
+++ b/app/assets/stylesheets/application.scss
@@ -21,6 +21,10 @@ $form-feedback-invalid-color: $magenta;
 $form-feedback-icon-valid-color: $black;
 $component-active-bg: $magenta;
 
+$spacers: (
+  2-plus: 0.75rem
+);
+
 @import "bootstrap";
 @import "editor";
 
diff --git a/app/controllers/posts_controller.rb b/app/controllers/posts_controller.rb
index a4b47a1..524335a 100644
--- a/app/controllers/posts_controller.rb
+++ b/app/controllers/posts_controller.rb
@@ -16,29 +16,25 @@ class PostsController < ApplicationController
     authorize Post
 
     @site = find_site
-    @category = params.dig(:category)
-    @layout = params.dig(:layout)
-    @locale = locale
+    @q = params[:q]
+    dictionary = IndexedPost.to_dictionary(locale: locale)
 
     # XXX: Cada vez que cambiamos un Post tocamos el sitio con lo que es
     # más simple saber si hubo cambios.
-    if @category || @layout || stale?(@site)
-      @posts = @site.posts(lang: locale)
-      @posts = @posts.where(categories: @category) if @category
-      @posts = @posts.where(layout: @layout) if @layout
+    if filter_params.present? || stale?(@site)
+      # Todos los artículos de este sitio para el idioma actual
+      @posts = @site.indexed_posts.where(locale: dictionary)
+      # De este tipo
+      @posts = @posts.where(layout: filter_params[:layout]) if filter_params[:layout]
+      # Que estén dentro de la categoría
+      @posts = @posts.in_category(filter_params[:category]) if filter_params[:category]
+      # Aplicar los parámetros de búsqueda
+      @posts = @posts.search(locale, filter_params[:q]) if filter_params[:q].present?
+      # A los que este usuarie tiene acceso
       @posts = PostPolicy::Scope.new(current_usuarie, @posts).resolve
 
-      @category_name = if uuid?(@category)
-                         @site.posts(lang: locale).find(@category, uuid: true)&.title&.value
-                       else
-                         @category
-                       end
-
       # Filtrar los posts que les invitades no pueden ver
       @usuarie = @site.usuarie? current_usuarie
-
-      # Orden descendiente por número y luego por fecha
-      @posts.sort_by!(:order, :date).reverse!
     end
   end
 
@@ -169,4 +165,14 @@ class PostsController < ApplicationController
   def forget_content
     flash[:js] = { target: 'editor', action: 'forget-content', keys: (params[:storage_keys] || []).to_json }
   end
+
+  private
+
+  # Los parámetros de filtros que vamos a mantener en todas las URLs,
+  # solo los que no estén vacíos.
+  #
+  # @return [Hash]
+  def filter_params
+    @filter_params ||= params.permit(:q, :category, :layout).to_h.select { |_,v| v.present? }
+  end
 end
diff --git a/app/models/indexed_post.rb b/app/models/indexed_post.rb
index c76a5c8..7bf1ec7 100644
--- a/app/models/indexed_post.rb
+++ b/app/models/indexed_post.rb
@@ -28,6 +28,8 @@ class IndexedPost < ApplicationRecord
 
   # Trae los IndexedPost en el orden en que van a terminar en el sitio.
   default_scope lambda { order(order: :desc, created_at: :desc) }
+  scope :in_category, lambda { |category| where("front_matter->'categories' ? :category", category: category.to_s) }
+  scope :by_usuarie, lambda { |usuarie| where("front_matter->'usuaries' @> :usuarie::jsonb", usuarie: usuarie.to_s) }
 
   belongs_to :site
 
diff --git a/app/models/post/indexable.rb b/app/models/post/indexable.rb
index b887dea..bee02e5 100644
--- a/app/models/post/indexable.rb
+++ b/app/models/post/indexable.rb
@@ -11,7 +11,7 @@ class Post
 
       # Devuelve una versión indexable del Post
       #
-      # @return [IndexedPosts]
+      # @return [IndexedPost]
       def to_index
         IndexedPost.find_or_create_by(id: uuid.value).tap do |indexed_post|
           indexed_post.layout = layout.name
@@ -41,9 +41,16 @@ class Post
       #
       # @return [Hash]
       def indexable_front_matter
-        return {} unless attribute? :categories
+        {}.tap do |indexable_front_matter|
+          indexable_front_matter = {
+            usuaries: usuaries.map(&:id),
+            draft: attribute?(:draft) ? draft.value : false
+          }
 
-        { categories: categories.indexable_values }
+          if attribute? :categories
+            indexable_front_matter[:categories] = categories.indexable_values
+          end
+        end
       end
 
       # Devuelve un documento indexable en texto plano
diff --git a/app/policies/post_policy.rb b/app/policies/post_policy.rb
index c22202a..69ecb18 100644
--- a/app/policies/post_policy.rb
+++ b/app/policies/post_policy.rb
@@ -59,9 +59,7 @@ class PostPolicy
     def resolve
       return scope if scope&.first&.site&.usuarie? usuarie
 
-      scope.select do |post|
-        post.usuaries.include? usuarie
-      end
+      scope.by_usuarie(usuarie.id)
     end
   end
 end
diff --git a/app/views/posts/index.haml b/app/views/posts/index.haml
index b2f3f66..9c43e43 100644
--- a/app/views/posts/index.haml
+++ b/app/views/posts/index.haml
@@ -3,7 +3,7 @@
     @site.name,
     link_to(t('posts.index'),
     site_posts_path(@site)),
-    @category_name]
+    @category]
 
 %main.row
   %aside.menu.col-md-3
@@ -14,15 +14,13 @@
     %table.mb-3
       - @site.layouts.each do |layout|
         - next if layout.hidden?
-        - filter = params[:layout] == layout.value
         %tr
           %th= layout.humanized_name
-          %td.pl-3= link_to t('posts.add'),
-            new_site_post_path(@site, layout: layout.name),
-            class: 'badge badge-secondary'
-          %td= link_to t(filter ? 'posts.remove_filter' : 'posts.filter'),
-            site_posts_path(@site, layout: (filter ? nil : layout.value)),
-            class: 'badge badge-' + (filter ? 'primary' : 'secondary')
+          %td.pl-3= link_to t('posts.add'), new_site_post_path(@site, **@filter_params), class: 'badge badge-secondary'
+          - if @filter_params[:layout] == layout.value
+            %td= link_to t('posts.remove_filter'), site_posts_path(@site, **@filter_params.merge(layout: nil)), class: 'badge badge-primary'
+          - else
+            %td= link_to t('posts.filter'), site_posts_path(@site, **@filter_params.merge(layout: layout.value)), class: 'badge badge-secondary'
 
     - if policy(@site).edit?
       = link_to t('sites.edit.btn', site: @site.title), edit_site_path(@site), class: 'btn'
@@ -48,19 +46,24 @@
 
   %section.col
     = render 'layouts/flash'
+    .d-flex.justify-content-between.align-items-center.pl-2-plus.pr-2-plus.mb-2
+      %form
+        - @filter_params.each do |param, value|
+          - next if param == 'q'
+          %input{ type: 'input', name: param, value: value }
+        .form-group.flex-grow-0.m-0
+          %input.form-control.border.border-magenta{ type: 'search', placeholder: 'Buscar', name: 'q', value: @q }
+          %input.sr-only{ type: 'submit' }
+      - if @site.locales.size > 1
+
+        %nav#locales
+          - @site.locales.each do |locale|
+            = link_to t("locales.#{locale}.name"), site_posts_path(@site, **@filter_params.merge(locale: locale)),
+              class: "mr-2 mt-2 mb-2 #{locale == @locale ? 'active font-weight-bold' : ''}"
     - if @posts.empty?
-      %h2= t('posts.none')
+      %h2= t('posts.empty')
     - else
       = form_tag site_posts_reorder_path, method: :post do
-        .d-flex.justify-content-between.align-items-center
-          -#
-            TODO: Pensar una interfaz mejor para cuando haya más de tres
-            idiomas
-          - unless @site.locales.length == 1
-            .locales
-              - @site.locales.each do |locale|
-                = link_to t("locales.#{locale}.name"), site_posts_path(@site, locale: locale),
-                  class: "mr-2 mt-2 mb-2#{locale == @locale ? 'active font-weight-bold' : ''}"
         %table.table{ data: { controller: 'reorder' } }
           %caption.sr-only= t('posts.caption')
           %thead
@@ -76,6 +79,7 @@
                 %button.btn{ data: { action: 'reorder#bottom' } }= t('posts.reorder.bottom')
           %tbody
             - dir = t("locales.#{@locale}.dir")
+            - size = @posts.size
             - @posts.each_with_index do |post, i|
               -#
                 TODO: Solo les usuaries cachean porque tenemos que separar
@@ -84,45 +88,36 @@
                 TODO: Verificar qué pasa cuando se gestiona el sitio en
                 distintos idiomas a la vez
               - cache_if @usuarie, post do
-                - checkbox_id = "checkbox-#{post.uuid.value}"
-                %tr{ id: post.uuid.value, data: { target: 'reorder.row' } }
+                - checkbox_id = "checkbox-#{post.id}"
+                %tr{ id: post.id, data: { target: 'reorder.row' } }
                   %td
                     .custom-control.custom-checkbox
                       %input.custom-control-input{ id: checkbox_id, type: 'checkbox', autocomplete: 'off', data: { action: 'reorder#select' } }
                       %label.custom-control-label{ for: checkbox_id }
                         %span.sr-only= t('posts.reorder.select')
                     -# Orden más alto es mayor prioridad
-                    = hidden_field 'post[reorder]', post.uuid.value,
-                      value: @posts.length - i,
+                    = hidden_field 'post[reorder]', post.id,
+                      value: size - i,
                       data: { reorder: true }
                   %td.w-100{ class: dir }
-                    = link_to site_post_path(@site, post.id) do
-                      %span{ lang: post.lang.value, dir: dir }= post.title.value
-                    - if post.attributes.include? :draft
-                      - if post.draft.value
-                        %span.badge.badge-primary
-                          = post_label_t(:draft, post: post)
-                    - if post.attributes.include? :categories
-                      - unless post.categories.value.empty?
-                        %br
-                        %small
-                          - (post.categories.respond_to?(:belongs_to) ? post.categories.belongs_to : post.categories.value).each do |c|
-                            = link_to site_posts_path(@site, category: (c.respond_to?(:uuid) ? c.uuid.value : c)) do
-                              %span{ lang: post.lang.value, dir: dir }= (c.respond_to?(:title) ? c.title.value : c)
+                    = link_to site_post_path(@site, post.path) do
+                      %span{ lang: post.locale, dir: dir }= post.title
+                    - if post.front_matter['draft'].present?
+                      %span.badge.badge-primary
+                        = post_label_t(:draft, post: post)
+                    - if post.front_matter['categories'].present?
+                      %br
+                      %small
+                        - post.front_matter['categories'].each do |category|
+                          = link_to site_posts_path(@site, **@filter_params.merge(category: category)) do
+                            %span{ lang: post.locale, dir: dir }= category
 
                   %td
-                    = post.date.value.strftime('%F')
+                    = post.created_at.strftime('%F')
                     %br/
-                    - if post.attribute? :order
-                      = post.order.value
+                    = post.order
                   %td
                     - if @usuarie || policy(post).edit?
-                      = link_to t('posts.edit'),
-                      edit_site_post_path(@site, post.id),
-                      class: 'btn btn-block'
+                      = link_to t('posts.edit'), edit_site_post_path(@site, post.path), class: 'btn btn-block'
                     - if @usuarie || policy(post).destroy?
-                      = link_to t('posts.destroy'),
-                        site_post_path(@site, post.id),
-                        class: 'btn btn-block',
-                        method: :delete,
-                        data: { confirm: t('posts.confirm_destroy') }
+                      = link_to t('posts.destroy'), site_post_path(@site, post.path), class: 'btn btn-block', method: :delete, data: { confirm: t('posts.confirm_destroy') }
diff --git a/config/locales/en.yml b/config/locales/en.yml
index dd9f830..54b6115 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -397,6 +397,7 @@ en:
     en: 'English'
     ar: 'Arabic'
   posts:
+    empty: "There are no results for those search parameters."
     attribute_ro:
       file:
         download: Download file
diff --git a/config/locales/es.yml b/config/locales/es.yml
index 403389a..b98ae14 100644
--- a/config/locales/es.yml
+++ b/config/locales/es.yml
@@ -459,6 +459,7 @@ es:
     en: 'inglés'
     ar: 'árabe'
   posts:
+    empty: No hay artículos con estos parámetros de búsqueda.
     caption: Lista de artículos
     attribute_ro:
       file: