diff --git a/app/controllers/api/base_controller.rb b/app/controllers/api/base_controller.rb
index 210fbbbb49..9d2d817d09 100644
--- a/app/controllers/api/base_controller.rb
+++ b/app/controllers/api/base_controller.rb
@@ -3,7 +3,6 @@
 class Api::BaseController < ApplicationController
   DEFAULT_STATUSES_LIMIT       = 20
   DEFAULT_ACCOUNTS_LIMIT       = 40
-  DEFAULT_EMOJI_REACTION_LIMIT = 10
 
   include RateLimitHeaders
   include AccessTokenTrackingConcern
diff --git a/app/controllers/api/v1/statuses/emoji_reactions_controller.rb b/app/controllers/api/v1/statuses/emoji_reactions_controller.rb
index da68f5813c..1b56033bc4 100644
--- a/app/controllers/api/v1/statuses/emoji_reactions_controller.rb
+++ b/app/controllers/api/v1/statuses/emoji_reactions_controller.rb
@@ -42,7 +42,7 @@ class Api::V1::Statuses::EmojiReactionsController < Api::BaseController
   def create_private(emoji)
     count = EmojiReaction.where(account: current_account, status: @status).count
 
-    if count >= DEFAULT_EMOJI_REACTION_LIMIT
+    if count >= EmojiReaction::EMOJI_REACTION_PER_ACCOUNT_LIMIT
       bad_request
       return
     end
diff --git a/app/lib/activitypub/activity/like.rb b/app/lib/activitypub/activity/like.rb
index 603816fcb2..9fd08280d9 100644
--- a/app/lib/activitypub/activity/like.rb
+++ b/app/lib/activitypub/activity/like.rb
@@ -38,7 +38,7 @@ class ActivityPub::Activity::Like < ActivityPub::Activity
       end
     end
 
-    return if EmojiReaction.where(account: @account, status: @original_status).count >= 10
+    return if EmojiReaction.where(account: @account, status: @original_status).count >= EmojiReaction::EMOJI_REACTION_PER_ACCOUNT_LIMIT
 
     reaction = @original_status.emoji_reactions.create!(account: @account, name: shortcode, custom_emoji: emoji, uri: @json['id'])
     write_stream(reaction)
diff --git a/app/models/emoji_reaction.rb b/app/models/emoji_reaction.rb
index b66751ffed..44e880d9fc 100644
--- a/app/models/emoji_reaction.rb
+++ b/app/models/emoji_reaction.rb
@@ -17,6 +17,9 @@
 class EmojiReaction < ApplicationRecord
   include Paginable
 
+  EMOJI_REACTION_LIMIT = 32767
+  EMOJI_REACTION_PER_ACCOUNT_LIMIT = 5
+
   update_index('statuses', :status)
 
   belongs_to :account,       inverse_of: :emoji_reactions
diff --git a/app/serializers/rest/instance_serializer.rb b/app/serializers/rest/instance_serializer.rb
index 9294f269ff..eb98750605 100644
--- a/app/serializers/rest/instance_serializer.rb
+++ b/app/serializers/rest/instance_serializer.rb
@@ -77,6 +77,11 @@ class REST::InstanceSerializer < ActiveModel::Serializer
       translation: {
         enabled: TranslationService.configured?,
       },
+
+      emoji_reactions: {
+        max_reactions: EmojiReaction::EMOJI_REACTION_LIMIT,
+        max_reactions_per_account: EmojiReaction::EMOJI_REACTION_PER_ACCOUNT_LIMIT,
+      },
     }
   end
 
@@ -92,7 +97,9 @@ class REST::InstanceSerializer < ActiveModel::Serializer
   def fedibird_capabilities
     capabilities = [
       :emoji_reaction,
-      :visibility_public_unlisted
+      :visibility_public_unlisted,
+      :enable_wide_emoji,
+      :enable_wide_emoji_reaction,
     ]
 
     capabilities << :profile_search unless Chewy.enabled?
diff --git a/app/serializers/rest/v1/instance_serializer.rb b/app/serializers/rest/v1/instance_serializer.rb
index 19334bbebe..338c79383e 100644
--- a/app/serializers/rest/v1/instance_serializer.rb
+++ b/app/serializers/rest/v1/instance_serializer.rb
@@ -83,6 +83,11 @@ class REST::V1::InstanceSerializer < ActiveModel::Serializer
         min_expiration: PollValidator::MIN_EXPIRATION,
         max_expiration: PollValidator::MAX_EXPIRATION,
       },
+
+      emoji_reactions: {
+        max_reactions: EmojiReaction::EMOJI_REACTION_LIMIT,
+        max_reactions_per_account: EmojiReaction::EMOJI_REACTION_PER_ACCOUNT_LIMIT,
+      },
     }
   end
 
@@ -102,7 +107,9 @@ class REST::V1::InstanceSerializer < ActiveModel::Serializer
   def fedibird_capabilities
     capabilities = [
       :emoji_reaction,
-      :visibility_public_unlisted
+      :visibility_public_unlisted,
+      :enable_wide_emoji,
+      :enable_wide_emoji_reaction,
     ]
 
     capabilities << :profile_search unless Chewy.enabled?