diff --git a/webapp_post.py b/webapp_post.py
index 3a10ec2ed..3d0b10d12 100644
--- a/webapp_post.py
+++ b/webapp_post.py
@@ -1581,7 +1581,7 @@ def _get_post_title_announce_html(base_dir: str,
     if actor_type:
         if actor_type != 'Person' or \
            announce_nickname in chatbot_nicknames():
-            bot_prefix = '[' + translate['Bot'] + '] '
+            bot_prefix = '<b>[' + translate['Bot'] + ']</b> '
 
     _log_post_timing(enable_timing_log, post_start_time, '13.3.1')
     announce_display_name2 = \
@@ -1737,7 +1737,7 @@ def _get_reply_html(translate: {},
             reply_nickname = reply_handle.split('@')[0]
         if actor_type != 'Person' or \
            reply_nickname in chatbot_nicknames():
-            bot_prefix = '[' + translate['Bot'] + '] '
+            bot_prefix = '<b>[' + translate['Bot'] + ']</b> '
 
     replying_to_str = _replying_to_with_scope(post_json_object, translate)
     post_bookmark = '#' + bookmark_from_id(in_reply_to)
@@ -2700,7 +2700,7 @@ def individual_post_as_html(signing_priv_key_pem: str,
     if actor_type:
         if actor_type != 'Person' or \
            actor_nickname in chatbot_nicknames():
-            bot_prefix = '[' + translate['Bot'] + '] '
+            bot_prefix = '<b>[' + translate['Bot'] + ']</b> '
 
     if display_name:
         display_name = _enforce_max_display_name_length(display_name)
diff --git a/webapp_profile.py b/webapp_profile.py
index c1fb5d566..e9cb4c14f 100644
--- a/webapp_profile.py
+++ b/webapp_profile.py
@@ -354,7 +354,8 @@ def html_profile_after_search(authorized: bool,
         if isinstance(profile_json['type'], str):
             if profile_json['type'] != 'Person' or \
                search_nickname in chatbot_nicknames():
-                display_name = '[' + translate['Bot'] + '] ' + display_name
+                display_name = \
+                    '<b>[' + translate['Bot'] + ']</b> ' + display_name
 
     pronouns = get_pronouns(profile_json)
     discord = get_discord(profile_json)
@@ -1190,7 +1191,8 @@ def html_profile(signing_priv_key_pem: str,
         if isinstance(profile_json['type'], str):
             if profile_json['type'] != 'Person' or \
                nickname in chatbot_nicknames():
-                display_name = '[' + translate['Bot'] + '] ' + display_name
+                display_name = \
+                    '<b>[' + translate['Bot'] + ']</b> ' + display_name
 
     domain_full = get_full_domain(domain, port)
     profile_status = get_actor_status(profile_json)
@@ -3929,7 +3931,8 @@ def _individual_follow_as_html(signing_priv_key_pem: str,
         actor_type = get_actor_type(base_dir, follow_url, person_cache)
         if actor_type != 'Person' or \
            actor_nickname in chatbot_nicknames():
-            display_name = '[' + translate['Bot'] + '] ' + display_name
+            display_name = \
+                '<b>[' + translate['Bot'] + ']</b> ' + display_name
         title_str = display_name
 
     if offline: