diff --git a/frontend/src/certs/NewRegister/CustomLabelSelect.tsx b/frontend/src/certs/NewRegister/CustomLabelSelect.tsx
index d3e4cba..f0eec82 100644
--- a/frontend/src/certs/NewRegister/CustomLabelSelect.tsx
+++ b/frontend/src/certs/NewRegister/CustomLabelSelect.tsx
@@ -78,7 +78,7 @@ export function CustomLabelSelect(props: {
                 placeholder="Denominación"
                 onkeyup={iHandler}
                 value={inputValue()}
-                onchange={(ev) => setInputValue(ev.target.value)}
+                oninput={(ev) => setInputValue(ev.target.value.toUpperCase())}
                 autocomplete="off"
             />
 
diff --git a/frontend/src/certs/NewRegister/ManualRegistration.tsx b/frontend/src/certs/NewRegister/ManualRegistration.tsx
index 2769fd6..40ebe44 100644
--- a/frontend/src/certs/NewRegister/ManualRegistration.tsx
+++ b/frontend/src/certs/NewRegister/ManualRegistration.tsx
@@ -107,7 +107,7 @@ export function ManualRegistration(props: {
                     <Show when={courseHasCustomLabel()}>
                         <div class="relative">
                             <CustomLabelSelect
-                                onChange={setCustomLabel}
+                                onChange={(v) => setCustomLabel(v.toUpperCase())}
                                 count={count()}
                             />
                             <label for="create-date" class="absolute -top-2 left-2 text-xs bg-c-surface px-1">