diff --git a/app/routers/web.py b/app/routers/web.py
index 4b53bd6..ee2800a 100644
--- a/app/routers/web.py
+++ b/app/routers/web.py
@@ -572,7 +572,7 @@ def postcard_create(
 
     pc = Postcard(
         profile_id=profile_id,
-        card_number=card_number.strip().upper(),
+        card_number=card_number.strip(),
         status=status,
         recipient_name=recipient_name or None,
         country=(country.strip().upper() if country else None),
@@ -650,7 +650,7 @@ def postcard_update(
             except ValueError:
                 return None
 
-    pc.card_number = card_number.strip().upper()
+    pc.card_number = card_number.strip()
     pc.status = status
     pc.recipient_name = recipient_name or None
     pc.country = country or None
diff --git a/app/templates/postcard_form.html b/app/templates/postcard_form.html
index 4ef821a..41fd2d3 100644
--- a/app/templates/postcard_form.html
+++ b/app/templates/postcard_form.html
@@ -5,8 +5,8 @@
     <h1>{{ ('pc_form.edit'|t(user.language)) if postcard else ('pc_form.new'|t(user.language)) }}</h1>
 </div>
 <form method="post" action="{{ '/postcards/%d/edit' % postcard.id if postcard else '/profiles/%d/postcards' % profile.id }}" class="form-card">
-    <label>{{ 'pc_form.number'|t(user.language) }} * <span style="font-weight:400;color:var(--text-muted);font-size:.8rem">{{ 'pc_form.number_hint'|t(user.language) }}</span></label>
-    <input type="text" name="card_number" value="{{ postcard.card_number if postcard else '' }}" required placeholder="AB-1234567" style="text-transform:uppercase" oninput="this.value=this.value.toUpperCase()">
+    <label>{{ 'pc_form.number'|t(user.language) }} *</label>
+    <input type="text" name="card_number" value="{{ postcard.card_number if postcard else '' }}" required>
 
     <label>{{ 'pc_form.status'|t(user.language) }} *</label>
     <select name="status" id="status-select" onchange="toggleFields()" required>