diff --git a/packages/adena-extension/src/components/atoms/web-copy-button/index.tsx b/packages/adena-extension/src/components/atoms/web-copy-button/index.tsx
index db133cb73..16e91b50a 100644
--- a/packages/adena-extension/src/components/atoms/web-copy-button/index.tsx
+++ b/packages/adena-extension/src/components/atoms/web-copy-button/index.tsx
@@ -1,17 +1,19 @@
-import React, { CSSProperties, useCallback, useMemo, useState } from 'react';
+import React, { CSSProperties, useCallback, useEffect, useMemo, useState } from 'react';
 import styled, { css, FlattenSimpleInterpolation, useTheme } from 'styled-components';
 
-import { WebText } from '../web-text';
-import { Row, View } from '../base';
 import IconCopy from '@assets/web/icon-copy';
+import { Row, View } from '../base';
+import { WebText } from '../web-text';
 
 interface WebCopyButtonProps {
   width?: CSSProperties['width'];
   height?: CSSProperties['height'];
   copyText: string;
+  clearClipboardTimeout?: number;
+  onCopy?: () => void;
 }
 
-const StyledContainer = styled(Row) <{ clicked: boolean }>`
+const StyledContainer = styled(Row)<{ clicked: boolean }>`
   display: flex;
   padding: 0 14px 0 14px;
   gap: 4px;
@@ -21,7 +23,7 @@ const StyledContainer = styled(Row) <{ clicked: boolean }>`
   border: 1px solid #212429;
   background: transparent;
   cursor: pointer;
-  user-select:none;
+  user-select: none;
 
   svg {
     width: 16px;
@@ -39,15 +41,23 @@ const StyledContainer = styled(Row) <{ clicked: boolean }>`
     }
   }
 
-  ${({ clicked }): FlattenSimpleInterpolation | string => clicked ? css`
-    background: rgba(255, 255, 255, 0.08);
-  `: ''}
+  ${({ clicked }): FlattenSimpleInterpolation | string =>
+    clicked
+      ? css`
+          background: rgba(255, 255, 255, 0.08);
+        `
+      : ''}
 `;
 
+const CLEAR_CLIPBOARD_TIMEOUT = 30_000; // 30 seconds
+const COPY_TOOLTIP_DISPLAY_TIMEOUT = 2_000; // 2 seconds
+
 export const WebCopyButton: React.FC<WebCopyButtonProps> = ({
   width = 'fit-content',
   height = 32,
   copyText,
+  clearClipboardTimeout = CLEAR_CLIPBOARD_TIMEOUT,
+  onCopy,
 }) => {
   const theme = useTheme();
   const [clicked, setClicked] = useState(false);
@@ -58,7 +68,7 @@ export const WebCopyButton: React.FC<WebCopyButtonProps> = ({
       return 'Copied!';
     }
     return 'Copy';
-  }, [clicked])
+  }, [clicked]);
 
   const activated = useMemo(() => {
     return mouseover || clicked;
@@ -69,11 +79,14 @@ export const WebCopyButton: React.FC<WebCopyButtonProps> = ({
       return;
     }
     setClicked(true);
+
     navigator.clipboard.writeText(copyText);
+    onCopy && onCopy();
+
     setTimeout(() => {
       setClicked(false);
-    }, 2000);
-  }, [clicked, copyText]);
+    }, COPY_TOOLTIP_DISPLAY_TIMEOUT);
+  }, [clicked, copyText, onCopy]);
 
   const onMouseOver = useCallback(() => {
     setMouseover(true);
@@ -83,6 +96,20 @@ export const WebCopyButton: React.FC<WebCopyButtonProps> = ({
     setMouseover(false);
   }, []);
 
+  useEffect(() => {
+    if (!clicked) {
+      return;
+    }
+
+    const timeout = setTimeout(() => {
+      navigator?.clipboard?.writeText('');
+    }, clearClipboardTimeout);
+
+    return () => {
+      clearTimeout(timeout);
+    };
+  }, [clicked, clearClipboardTimeout]);
+
   return (
     <StyledContainer
       style={{
@@ -96,10 +123,7 @@ export const WebCopyButton: React.FC<WebCopyButtonProps> = ({
       onMouseOut={onMouseLeave}
     >
       {clicked ? (
-        <WebText
-          color={activated ? theme.webNeutral._100 : theme.webNeutral._500}
-          type='body6'
-        >
+        <WebText color={activated ? theme.webNeutral._100 : theme.webNeutral._500} type='body6'>
           {buttonStr}
         </WebText>
       ) : (
@@ -107,14 +131,11 @@ export const WebCopyButton: React.FC<WebCopyButtonProps> = ({
           <View>
             <IconCopy />
           </View>
-          <WebText
-            color={activated ? theme.webNeutral._100 : theme.webNeutral._500}
-            type='title6'
-          >
+          <WebText color={activated ? theme.webNeutral._100 : theme.webNeutral._500} type='title6'>
             {buttonStr}
           </WebText>
         </React.Fragment>
       )}
     </StyledContainer>
   );
-}
\ No newline at end of file
+};
diff --git a/packages/adena-extension/src/pages/web/wallet-create-screen/get-mnemonic-step.tsx b/packages/adena-extension/src/pages/web/wallet-create-screen/get-mnemonic-step.tsx
index 2851a0946..4f5691934 100644
--- a/packages/adena-extension/src/pages/web/wallet-create-screen/get-mnemonic-step.tsx
+++ b/packages/adena-extension/src/pages/web/wallet-create-screen/get-mnemonic-step.tsx
@@ -1,13 +1,13 @@
-import { ReactElement, useState } from 'react';
+import { ReactElement, useMemo, useState } from 'react';
 import styled, { useTheme } from 'styled-components';
 
 import IconWarning from '@assets/web/warning.svg';
 
 import { Row, View, WebButton, WebCheckBox, WebImg, WebText } from '@components/atoms';
+import { WebCopyButton } from '@components/atoms/web-copy-button';
+import { WebHoldButton } from '@components/atoms/web-hold-button';
 import { WebSeedBox } from '@components/molecules';
 import { UseWalletCreateReturn } from '@hooks/web/use-wallet-create-screen';
-import { WebHoldButton } from '@components/atoms/web-hold-button';
-import { WebCopyButton } from '@components/atoms/web-copy-button';
 
 const StyledContainer = styled(View)`
   width: 100%;
@@ -36,6 +36,18 @@ const GetMnemonicStep = ({
   const [ableToReveal, setAbleToReveal] = useState(false);
   const [agreeAbleToReveals, setAgreeAbleToReveals] = useState(false);
   const [checkSavedMnemonic, setCheckSavedMnemonic] = useState(false);
+  const [copied, setCopied] = useState(false);
+
+  const warningCopiedMessage = useMemo(() => {
+    if (!copied) {
+      return '';
+    }
+    return 'You have copied sensitive info. Make sure you do not paste it in public or shared environments, and clear your clipboard as soon as you’ve used it.';
+  }, [copied]);
+
+  const onCopy = (): void => {
+    setCopied(true);
+  };
 
   return (
     <StyledContainer>
@@ -47,6 +59,15 @@ const GetMnemonicStep = ({
             This phrase is the only way to recover this wallet. DO NOT share it with anyone.
           </WebText>
         </StyledWarnBox>
+
+        {warningCopiedMessage && (
+          <StyledWarnBox>
+            <WebImg src={IconWarning} size={20} />
+            <WebText type='body6' color={theme.webWarning._100}>
+              {warningCopiedMessage}
+            </WebText>
+          </StyledWarnBox>
+        )}
       </StyledMessageBox>
 
       <View style={{ width: '100%', gap: 16 }}>
@@ -56,7 +77,7 @@ const GetMnemonicStep = ({
           <>
             <Row style={{ justifyContent: 'center', columnGap: 12 }}>
               <WebHoldButton onFinishHold={(response): void => setShowBlur(!response)} />
-              <WebCopyButton width={80} copyText={seeds} />
+              <WebCopyButton width={80} copyText={seeds} onCopy={onCopy} />
             </Row>
             <Row style={{ columnGap: 8, alignItems: 'center', marginTop: 8 }}>
               <WebCheckBox
diff --git a/packages/adena-extension/src/pages/web/wallet-export-screen/result.tsx b/packages/adena-extension/src/pages/web/wallet-export-screen/result.tsx
index 5ebc231ea..3fc9535ab 100644
--- a/packages/adena-extension/src/pages/web/wallet-export-screen/result.tsx
+++ b/packages/adena-extension/src/pages/web/wallet-export-screen/result.tsx
@@ -48,6 +48,7 @@ const WalletExportResult: React.FC<WalletExportResultProps> = ({ exportType, exp
   const theme = useTheme();
   const [blur, setBlur] = useState(true);
   const [initializedDone, setInitializedDone] = useState(false);
+  const [copied, setCopied] = useState(false);
 
   const title = useMemo(() => {
     if (exportType === 'PRIVATE_KEY') {
@@ -63,6 +64,13 @@ const WalletExportResult: React.FC<WalletExportResultProps> = ({ exportType, exp
     return 'Your seed phrase is the only way to recover your wallet. Keep it somewhere safe and secret.';
   }, [exportType]);
 
+  const warningCopiedMessage = useMemo(() => {
+    if (!copied) {
+      return '';
+    }
+    return 'You have copied sensitive info. Make sure you do not paste it in public or shared environments, and clear your clipboard as soon as you’ve used it.';
+  }, [copied]);
+
   const seeds = useMemo((): string[] => {
     if (exportType !== 'SEED_PHRASE' || !exportData) {
       return [];
@@ -97,6 +105,10 @@ const WalletExportResult: React.FC<WalletExportResultProps> = ({ exportType, exp
       });
   };
 
+  const onCopy = (): void => {
+    setCopied(true);
+  };
+
   return (
     <StyledContainer>
       <StyledMessageBox>
@@ -107,6 +119,15 @@ const WalletExportResult: React.FC<WalletExportResultProps> = ({ exportType, exp
             {warningMessage}
           </WebText>
         </StyledWarnBox>
+
+        {warningCopiedMessage && (
+          <StyledWarnBox center={exportType === 'SEED_PHRASE'}>
+            <WebImg src={IconWarning} size={20} />
+            <WebText type='body6' color={theme.webWarning._100}>
+              {warningCopiedMessage}
+            </WebText>
+          </StyledWarnBox>
+        )}
       </StyledMessageBox>
 
       <StyledInputBox>
@@ -116,7 +137,7 @@ const WalletExportResult: React.FC<WalletExportResultProps> = ({ exportType, exp
         )}
         <Row style={{ gap: 16, justifyContent: 'center' }}>
           <WebHoldButton onFinishHold={onFinishHold} />
-          <WebCopyButton width={80} copyText={exportData || ''} />
+          <WebCopyButton width={80} copyText={exportData || ''} onCopy={onCopy} />
         </Row>
       </StyledInputBox>