diff --git a/src/features/common/components/card-tabs/card-tabs.component.tsx b/src/features/common/components/card-tabs/card-tabs.component.tsx
index ac6e3ae2..00af36ee 100644
--- a/src/features/common/components/card-tabs/card-tabs.component.tsx
+++ b/src/features/common/components/card-tabs/card-tabs.component.tsx
@@ -21,6 +21,7 @@ import {
   TabPanel,
   Tabs,
 } from "react-aria-components";
+import { Spinner } from "../spinner/spinner.component";
 
 type CardTabsProps = {
   resizeId: string;
@@ -28,6 +29,7 @@ type CardTabsProps = {
   title: string | null;
   cards: CardComponentProps[];
   activeTabId: string;
+  isLoading?: boolean;
   handleActiveCardChange: (tabId: string) => void;
 };
 
@@ -35,17 +37,18 @@ const CardTabs: React.FC<CardTabsProps> = ({
   resizeId,
   title,
   cards,
+  isLoading,
   activeTabId,
   handleActiveCardChange,
 }) => {
   const tabsId = useId();
 
   const outputModalState$ = useDebuggerStore(
-    (state) => state.outputModalState$,
+    (state) => state.outputModalState$
   );
   const outputModalId$ = useDebuggerStore((state) => state.outputModalId$);
   const closeOutputModal$ = useDebuggerStore(
-    (state) => state.closeOutputModal$,
+    (state) => state.closeOutputModal$
   );
 
   const activeCard = cards.filter((card) => card.id === activeTabId)[0];
@@ -166,9 +169,12 @@ const CardTabs: React.FC<CardTabsProps> = ({
         className={styles.cardTabs__container}
       >
         {title && (
-          <h4 id={tabsId} className={styles.cardTabs__title}>
-            {title}
-          </h4>
+          <div className={styles.cardTabs__title__container}>
+            <h4 id={tabsId} className={styles.cardTabs__title}>
+              {title}
+            </h4>
+            {isLoading && <Spinner />}
+          </div>
         )}
         <Tabs
           selectedKey={activeCard.id}
@@ -269,6 +275,7 @@ type CardTabsWithTabPersistenceComponentProps = {
   languageCode: string;
   title: string | null;
   cards: CardComponentProps[];
+  isLoading?: boolean;
   handleTabChange: (key: string) => void;
 };
 
@@ -281,6 +288,7 @@ export const CardTabsWithTabPersistenceComponentProps: React.FC<
   languageCode,
   title,
   cards,
+  isLoading,
   handleTabChange,
 }) => {
   const [activeTabId, setActiveTabId] = useState<string>(initialTabId);
@@ -309,6 +317,7 @@ export const CardTabsWithTabPersistenceComponentProps: React.FC<
       languageCode={languageCode}
       title={title}
       cards={cards}
+      isLoading={isLoading}
       activeTabId={activeTabId}
       handleActiveCardChange={handleActiveCardChange}
     />
diff --git a/src/features/common/components/card-tabs/card-tabs.module.scss b/src/features/common/components/card-tabs/card-tabs.module.scss
index 6878b6e7..8e7a0c44 100644
--- a/src/features/common/components/card-tabs/card-tabs.module.scss
+++ b/src/features/common/components/card-tabs/card-tabs.module.scss
@@ -24,6 +24,7 @@
   line-height: 1.375rem;
   font-weight: 500;
   letter-spacing: 0.24px;
+  margin-right: 8px;
 }
 
 .cardTabs {
@@ -49,6 +50,11 @@ $cardTabs__tabList__height: 2.5rem;
   flex-shrink: 0;
 }
 
+.cardTabs__title__container {
+  display: flex;
+
+}
+
 .cardTab__title {
   position: relative;
   display: flex;
diff --git a/src/features/common/components/spinner/spinner.component.tsx b/src/features/common/components/spinner/spinner.component.tsx
new file mode 100644
index 00000000..b844cbd1
--- /dev/null
+++ b/src/features/common/components/spinner/spinner.component.tsx
@@ -0,0 +1,24 @@
+import React from "react";
+import { ProgressBar } from "react-aria-components";
+import styles from "./spinner.module.scss";
+
+export const Spinner = () => {
+  return (
+    <ProgressBar aria-label="Loading…" isIndeterminate>
+      {() => (
+        <div className={styles.circular__spinner}>
+          <svg className={styles.spinner__svg} viewBox="0 0 20 20">
+            <circle
+              className={styles.spinner__circle}
+              cx="10"
+              cy="10"
+              r="8"
+              fill="none"
+              strokeWidth="4"
+            />
+          </svg>
+        </div>
+      )}
+    </ProgressBar>
+  );
+};
diff --git a/src/features/common/components/spinner/spinner.module.scss b/src/features/common/components/spinner/spinner.module.scss
new file mode 100644
index 00000000..af366eb9
--- /dev/null
+++ b/src/features/common/components/spinner/spinner.module.scss
@@ -0,0 +1,40 @@
+.circular__spinner {
+    width: 16px;
+    height: 16px;
+    display: inline-block;
+}
+
+.spinner__svg {
+    animation: rotate 1s linear infinite;
+    width: 100%;
+    height: 100%;
+}
+
+.spinner__circle {
+    stroke: var(--color_fg_default);
+    stroke-dasharray: 90 150;
+    stroke-dashoffset: 0;
+    stroke-linecap: round;
+    animation: dash 1.5s ease-in-out infinite;
+}
+
+@keyframes rotate {
+    100% {
+        transform: rotate(360deg);
+    }
+}
+
+@keyframes dash {
+    0% {
+        stroke-dasharray: 1, 200;
+        stroke-dashoffset: 0;
+    }
+    50% {
+        stroke-dasharray: 100, 200;
+        stroke-dashoffset: -15;
+    }
+    100% {
+        stroke-dasharray: 1, 200;
+        stroke-dashoffset: -126;
+    }
+}
\ No newline at end of file
diff --git a/src/features/decoder/components/decoded-header-output.component.tsx b/src/features/decoder/components/decoded-header-output.component.tsx
index bb8d2e4a..653b67eb 100644
--- a/src/features/decoder/components/decoded-header-output.component.tsx
+++ b/src/features/decoder/components/decoded-header-output.component.tsx
@@ -38,6 +38,7 @@ export const DecodedHeaderOutputComponent: React.FC<
   );
 
   const decodedHeader$ = useDecoderStore((state) => state.decodedHeader);
+  const isLoading = useDecoderStore((state) => state.isLoading)
 
   const cards: CardComponentProps[] = [
     {
@@ -105,6 +106,7 @@ export const DecodedHeaderOutputComponent: React.FC<
       initialTabId={decodedHeaderInitialTabId}
       languageCode={languageCode}
       title={dictionary.title}
+      isLoading={isLoading}
       cards={cards}
       handleTabChange={setDecodedHeaderTabValue$}
     />
diff --git a/src/features/decoder/services/decoder.store.ts b/src/features/decoder/services/decoder.store.ts
index f0aef337..9eb5da52 100644
--- a/src/features/decoder/services/decoder.store.ts
+++ b/src/features/decoder/services/decoder.store.ts
@@ -48,6 +48,7 @@ export type DecoderStoreState = {
   asymmetricPublicKeyFormat: AsymmetricKeyFormatValues;
   decodedHeader: string;
   decodedPayload: string;
+  isLoading: boolean;
   signatureStatus: JwtSignatureStatusValues;
   controlledSymmetricSecretKey: {
     id: number;
@@ -70,11 +71,11 @@ type DecoderStoreActions = {
   handleJwtChange: (newToken: string) => void;
   handleSymmetricSecretKeyChange: (newSymmetricSecretKey: string) => void;
   handleSymmetricSecretKeyEncodingChange: (
-    newSymmetricSecretKey: EncodingValues,
+    newSymmetricSecretKey: EncodingValues
   ) => void;
   handleAsymmetricPublicKeyChange: (newAsymmetricPublicKey: string) => void;
   handleAsymmetricPublicKeyFormatChange: (
-    newFormat: AsymmetricKeyFormatValues,
+    newFormat: AsymmetricKeyFormatValues
   ) => void;
   resetControlledSymmetricSecretKey: () => void;
   resetControlledAsymmetricPublicKey: () => void;
@@ -92,6 +93,7 @@ export const initialState: DecoderStoreState = {
   asymmetricPublicKeyFormat: AsymmetricKeyFormatValues.PEM,
   decodedHeader: DEFAULT_DECODED_HEADER,
   decodedPayload: DEFAULT_DECODED_PAYLOAD,
+  isLoading: false,
   signatureStatus: JwtSignatureStatusValues.VALID,
   signatureWarnings: null,
   decodingErrors: null,
@@ -120,6 +122,12 @@ export const useDecoderStore = create<DecoderStore>()(
         asymmetricPublicKeyFormat,
       } = get();
 
+      set({
+        isLoading: true,
+        decodedHeader: "",
+        decodedPayload: "",
+      });
+
       const update = await TokenDecoderService.handleJwtChange({
         alg,
         symmetricSecretKey,
@@ -129,7 +137,10 @@ export const useDecoderStore = create<DecoderStore>()(
         newToken,
       });
 
-      set(update);
+      set({
+        ...update,
+        isLoading: false,
+      });
     },
     handleSymmetricSecretKeyChange: async (newSymmetricSecretKey) => {
       const { jwt, symmetricSecretKeyEncoding } = get();
@@ -208,5 +219,5 @@ export const useDecoderStore = create<DecoderStore>()(
 
       set(update);
     },
-  })),
+  }))
 );