diff --git a/README.md b/README.md
index e718b93..7de7a1c 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,7 @@ It does not require any additional licenses, except for MIT. ([#38](https://gith
 | [Custom `sep` Style](#options-sep)                                      | ✅    |
 | [Fixation-Points](#options-fixationpoint)                               | ✅    |
 | [Ignore HTML Tags](#options-ignorehtmltag)                              | ✅    |
+| [Ignore HTML Entity](#options-ignorehtmlentity)                         | ✅    |
 | [Saccade](https://github.com/Gumball12/text-vide/issues/21)             | ❌    |
 
 ### Benchmark
@@ -123,7 +124,7 @@ type Options = Partial<{
 
 #### `sep`<a id="options-sep"></a>
 
-- Default Value: `['<b>', '</b>']`
+- Default: `['<b>', '</b>']`
 
 Passing a string allows you to specify the Beginning and End of the highlighted word at once.
 
@@ -139,7 +140,7 @@ textVide('text-vide', { sep: ['<strong>', '</strong>'] }); // '<strong>tex</stro
 
 #### `fixationPoint`<a id="options-fixationpoint"></a>
 
-- Default Value: `1`
+- Default: `1`
 - Range: `[1, 5]`
 
 ```ts
@@ -152,7 +153,7 @@ textVide('text-vide', { fixationPoint: 5 }); // '<b>t</b>ext-<b>v</b>ide'
 
 #### `ignoreHtmlTag`<a id="options-ignorehtmltag"></a>
 
-- Default Value: `true`
+- Default: `true`
 
 If this option is `true`, HTML tags are not highlighted.
 
@@ -161,6 +162,17 @@ textVite('<div>abcd</div>efg'); // '<div><b>abc</b>d</div><b>ef</b>g'
 textVite('<div>abcd</div>efg', { ignoreHtmlTag: false }); // '<<b>di</b>v><b>abc</b>d</<b>di</b>v><b>ef</b>g'
 ```
 
+#### `ignoreHtmlEntity`<a id="options-ignorehtmlentity"></a>
+
+- Default: `true`
+
+If this option is `true`, HTML entities are not highlighted.
+
+```ts
+textVide('&nbsp;abcd&gt;'); // '&nbsp;<b>abc</b>d&gt;'
+textVide('&nbsp;abcd&gt;', { ignoreHtmlEntity: false }); // &<b>nbs</b>p;<b>abc</b>d&<b>g</b>t;
+```
+
 ## License
 
 [MIT](./LICENSE) @Gumball12
diff --git a/apps/sandbox/src/App.tsx b/apps/sandbox/src/App.tsx
index 241c9e0..6a806a8 100644
--- a/apps/sandbox/src/App.tsx
+++ b/apps/sandbox/src/App.tsx
@@ -20,6 +20,7 @@ type Edits = {
   secondSep: string;
   fixationPoint: string;
   ignoreHtmlTag: string;
+  ignoreHtmlEntity: string;
   input: string;
 };
 
@@ -28,6 +29,7 @@ const defaultEdits: Edits = {
   secondSep: '</b>',
   fixationPoint: '1',
   ignoreHtmlTag: '1', // 1 = true, 0 = false
+  ignoreHtmlEntity: '1', // 1 = true, 0 = false
   input: INITIAL_INPUT,
 };
 
@@ -37,6 +39,7 @@ const storeEdits = ({
   fixationPoint,
   input,
   ignoreHtmlTag,
+  ignoreHtmlEntity,
 }: Edits) => {
   const search = [
     `firstSep=${encodeURIComponent(firstSep)}`,
@@ -44,6 +47,7 @@ const storeEdits = ({
     `fixationPoint=${encodeURIComponent(fixationPoint)}`,
     `input=${encodeURIComponent(input)}`,
     `ignoreHtmlTag=${encodeURIComponent(ignoreHtmlTag)}`,
+    `ignoreHtmlEntity=${encodeURIComponent(ignoreHtmlEntity)}`,
   ].join('&');
 
   // eslint-disable-next-line
@@ -100,6 +104,7 @@ type Action = {
     | 'HIGHLIGHTED_TEXT'
     | 'COPIED'
     | 'TOGGLE_IGNORE_HTML_TAG'
+    | 'TOGGLE_IGNORE_HTML_ENTITY'
     | 'RESET';
   value: string;
   copied: boolean;
@@ -135,6 +140,11 @@ const reducer: Reducer<State, Action> = (state, { type, value, copied }) => {
     return { ...state, ignoreHtmlTag: nextIgnoreHtmlTag };
   }
 
+  if (type === 'TOGGLE_IGNORE_HTML_ENTITY') {
+    const nextIgnoreHtmlEntity = state.ignoreHtmlEntity === '1' ? '0' : '1';
+    return { ...state, ignoreHtmlEntity: nextIgnoreHtmlEntity };
+  }
+
   if (type === 'RESET') {
     return {
       ...defaultEdits,
@@ -161,6 +171,7 @@ const App = () => {
     copiedEffect,
     highlightedText,
     ignoreHtmlTag,
+    ignoreHtmlEntity,
   } = state;
 
   useEffect(() => {
@@ -169,6 +180,7 @@ const App = () => {
         sep: [firstSep, secondSep],
         fixationPoint: parseInt(fixationPoint),
         ignoreHtmlTag: ignoreHtmlTag === '1',
+        ignoreHtmlEntity: ignoreHtmlEntity === '1',
       };
 
       const highlightedText = textVide(input, options);
@@ -185,11 +197,19 @@ const App = () => {
         input,
         fixationPoint,
         ignoreHtmlTag,
+        ignoreHtmlEntity,
       });
     }, DEBOUNCE_TIMEOUT);
 
     return () => clearTimeout(store);
-  }, [firstSep, secondSep, input, fixationPoint, ignoreHtmlTag]);
+  }, [
+    firstSep,
+    secondSep,
+    input,
+    fixationPoint,
+    ignoreHtmlTag,
+    ignoreHtmlEntity,
+  ]);
 
   const copyUrl = () => {
     const { href: url } = location;
@@ -217,6 +237,7 @@ const App = () => {
       fixationPoint,
       input,
       ignoreHtmlTag,
+      ignoreHtmlEntity,
     });
 
   return (
@@ -265,19 +286,9 @@ const App = () => {
                 InputLabelProps={{ shrink: true }}
               />
             </div>
-
-            <Button
-              className="!hidden sm:!block"
-              variant="outlined"
-              color="error"
-              onClick={reset}
-              disabled={isResetDisabled}
-            >
-              reset
-            </Button>
           </section>
 
-          <section className="flex justify-between">
+          <section className="flex gap-2 flex-wrap">
             <ToggleButtonGroup
               size="small"
               exclusive
@@ -296,7 +307,6 @@ const App = () => {
             </ToggleButtonGroup>
 
             <Button
-              className="!hidden sm:!block"
               variant="outlined"
               color="success"
               onClick={() =>
@@ -313,31 +323,30 @@ const App = () => {
             </Button>
 
             <Button
-              className="!block sm:!hidden"
-              variant="outlined"
-              color="error"
-              onClick={reset}
-            >
-              reset
-            </Button>
-          </section>
-
-          <section>
-            <Button
-              className="!block sm:!hidden"
               variant="outlined"
               color="success"
               onClick={() =>
                 dispatchState({
-                  type: 'TOGGLE_IGNORE_HTML_TAG',
+                  type: 'TOGGLE_IGNORE_HTML_ENTITY',
                   value: '',
                   copied: false,
                 })
               }
             >
-              {ignoreHtmlTag === '1'
-                ? 'not ignore html tags'
-                : 'ignore html tags'}
+              {ignoreHtmlEntity === '1'
+                ? 'not ignore html entities'
+                : 'ignore html entities'}
+            </Button>
+          </section>
+
+          <section className="flex gap-2">
+            <Button
+              variant="outlined"
+              color="error"
+              onClick={reset}
+              disabled={isResetDisabled}
+            >
+              reset
             </Button>
           </section>
         </section>
diff --git a/packages/text-vide/src/__tests__/getOptions.test.ts b/packages/text-vide/src/__tests__/getOptions.test.ts
index 252aba1..8a2906a 100644
--- a/packages/text-vide/src/__tests__/getOptions.test.ts
+++ b/packages/text-vide/src/__tests__/getOptions.test.ts
@@ -8,6 +8,7 @@ describe('test getOptions()', () => {
       sep: ['<b>', '</b>'],
       fixationPoint: 1,
       ignoreHtmlTag: true,
+      ignoreHtmlEntity: true,
     };
 
     expect(getOptions({})).toEqual(expected);
@@ -18,12 +19,14 @@ describe('test getOptions()', () => {
       sep: undefined,
       fixationPoint: undefined,
       ignoreHtmlTag: undefined,
+      ignoreHtmlEntity: undefined,
     };
 
     const expected: Options = {
       sep: ['<b>', '</b>'],
       fixationPoint: 1,
       ignoreHtmlTag: true,
+      ignoreHtmlEntity: true,
     };
 
     expect(getOptions(undefinedOptionValues)).toEqual(expected);
@@ -34,12 +37,14 @@ describe('test getOptions()', () => {
       sep: ['', ''],
       fixationPoint: undefined,
       ignoreHtmlTag: undefined,
+      ignoreHtmlEntity: undefined,
     };
 
     const expected: Options = {
       sep: ['', ''],
       fixationPoint: 1,
       ignoreHtmlTag: true,
+      ignoreHtmlEntity: true,
     };
 
     expect(getOptions(maybeOptions)).toEqual(expected);
@@ -50,6 +55,7 @@ describe('test getOptions()', () => {
       sep: ['a', 'b'],
       fixationPoint: 0, // but it's okay
       ignoreHtmlTag: false,
+      ignoreHtmlEntity: false,
     };
 
     expect(getOptions(expected)).toEqual(expected);
diff --git a/packages/text-vide/src/__tests__/index.test.ts b/packages/text-vide/src/__tests__/index.test.ts
index deef14f..ab3e68f 100644
--- a/packages/text-vide/src/__tests__/index.test.ts
+++ b/packages/text-vide/src/__tests__/index.test.ts
@@ -158,6 +158,30 @@ describe('test options', () => {
 
     expect(textVide(text)).toBe(expected);
   });
+
+  it('ignoreHtmlTag: true', () => {
+    const text = '<div>abcd</div>efg';
+    const expectedText = '<div><b>abc</b>d</div><b>ef</b>g';
+    expect(textVide(text, { ignoreHtmlTag: true })).toBe(expectedText);
+  });
+
+  it('ignoreHtmlTag: false', () => {
+    const text = '<div>abcd</div>efg';
+    const expected = '<<b>di</b>v><b>abc</b>d</<b>di</b>v><b>ef</b>g';
+    expect(textVide(text, { ignoreHtmlTag: false })).toBe(expected);
+  });
+
+  it('ignoreHtmlEntity: true', () => {
+    const text = '&nbsp;abcd&gt;';
+    const expectedText = '&nbsp;<b>abc</b>d&gt;';
+    expect(textVide(text, { ignoreHtmlEntity: true })).toBe(expectedText);
+  });
+
+  it('ignoreHtmlEntity: false', () => {
+    const text = '&nbsp;abcd&gt;';
+    const expected = '&<b>nbs</b>p;<b>abc</b>d&<b>g</b>t;';
+    expect(textVide(text, { ignoreHtmlEntity: false })).toBe(expected);
+  });
 });
 
 describe('fixation point ([2, 5])', () => {
diff --git a/packages/text-vide/src/getOptions.ts b/packages/text-vide/src/getOptions.ts
index ef65415..1279f93 100644
--- a/packages/text-vide/src/getOptions.ts
+++ b/packages/text-vide/src/getOptions.ts
@@ -4,10 +4,12 @@ import defaults from 'utils/defaults';
 const DEFAULT_SEP = ['<b>', '</b>'];
 const DEFAULT_FIXATION_POINT = 1;
 const DEFAULT_IGNORE_HTML_TAG = true;
+const DEFAULT_IGNORE_HTML_ENTITY = true;
 
 export default (maybeOptions: Partial<Options>): Options =>
   defaults(maybeOptions, {
     sep: DEFAULT_SEP,
     fixationPoint: DEFAULT_FIXATION_POINT,
     ignoreHtmlTag: DEFAULT_IGNORE_HTML_TAG,
+    ignoreHtmlEntity: DEFAULT_IGNORE_HTML_ENTITY,
   });
diff --git a/packages/text-vide/src/index.ts b/packages/text-vide/src/index.ts
index ff1ee22..ac9fa71 100644
--- a/packages/text-vide/src/index.ts
+++ b/packages/text-vide/src/index.ts
@@ -3,6 +3,7 @@ import getOptions from './getOptions';
 import getFixationLength from './getFixationLength';
 import getHighlightedText from './getHighlightedText';
 import { useCheckIsHtmlTag } from './useCheckIsHtmlTag';
+import { useCheckIsHtmlEntity } from './useCheckIsHtmlEntity';
 
 const CONVERTIBLE_REGEX = /(\p{L}|\p{Nd})*\p{L}(\p{L}|\p{Nd})*/gu;
 
@@ -11,24 +12,34 @@ export const textVide = (text: string, maybeOptions: Partial<Options> = {}) => {
     return '';
   }
 
-  const { fixationPoint, sep, ignoreHtmlTag } = getOptions(maybeOptions);
-  const convertibleMatchList = text.matchAll(CONVERTIBLE_REGEX);
+  const { fixationPoint, sep, ignoreHtmlTag, ignoreHtmlEntity } =
+    getOptions(maybeOptions);
+  const convertibleMatchList = Array.from(text.matchAll(CONVERTIBLE_REGEX));
 
   let result = '';
   let lastMatchedIndex = 0;
 
   let checkIsHtmlTag: ReturnType<typeof useCheckIsHtmlTag> | undefined;
-
   if (ignoreHtmlTag) {
     checkIsHtmlTag = useCheckIsHtmlTag(text);
   }
 
+  let checkIsHtmlEntity: ReturnType<typeof useCheckIsHtmlEntity> | undefined;
+  if (ignoreHtmlEntity) {
+    checkIsHtmlEntity = useCheckIsHtmlEntity(text);
+  }
+
   for (const match of convertibleMatchList) {
     const isHtmlTag = checkIsHtmlTag?.(match);
     if (isHtmlTag) {
       continue;
     }
 
+    const isHtmlEntity = checkIsHtmlEntity?.(match);
+    if (isHtmlEntity) {
+      continue;
+    }
+
     const [matchedWord] = match;
     const startIndex = match.index!;
     const endIndex = startIndex + getFixationLength(matchedWord, fixationPoint);
diff --git a/packages/text-vide/src/types.ts b/packages/text-vide/src/types.ts
index d045992..ff66c4a 100644
--- a/packages/text-vide/src/types.ts
+++ b/packages/text-vide/src/types.ts
@@ -2,4 +2,5 @@ export type Options = {
   sep: string | string[]; // default: ['<b>', '</b>']
   fixationPoint: number; // default: 1
   ignoreHtmlTag: boolean; // default: true
+  ignoreHtmlEntity: boolean; // default: true
 };
diff --git a/packages/text-vide/src/useCheckIsHtmlEntity.ts b/packages/text-vide/src/useCheckIsHtmlEntity.ts
new file mode 100644
index 0000000..d291d41
--- /dev/null
+++ b/packages/text-vide/src/useCheckIsHtmlEntity.ts
@@ -0,0 +1,24 @@
+import { extractMatchRangeList } from './utils';
+
+const HTML_ENTITY_REGEX = /(&[\w#]+;)/g;
+
+export const useCheckIsHtmlEntity = (text: string) => {
+  const htmlEntityMatchList = text.matchAll(HTML_ENTITY_REGEX);
+  const htmlEntityRangeList = extractMatchRangeList(htmlEntityMatchList);
+  const reversedHtmlEntityRangeList = htmlEntityRangeList.reverse();
+
+  return (match: RegExpMatchArray) => {
+    const startIndex = match.index!;
+    const entityRange = reversedHtmlEntityRangeList.find(
+      ([rangeStart]) => startIndex > rangeStart,
+    );
+
+    if (!entityRange) {
+      return false;
+    }
+
+    const [, rangeEnd] = entityRange;
+    const isInclude = startIndex < rangeEnd;
+    return isInclude;
+  };
+};
diff --git a/packages/text-vide/src/useCheckIsHtmlTag.ts b/packages/text-vide/src/useCheckIsHtmlTag.ts
index 74e8688..3abed67 100644
--- a/packages/text-vide/src/useCheckIsHtmlTag.ts
+++ b/packages/text-vide/src/useCheckIsHtmlTag.ts
@@ -1,8 +1,10 @@
+import { extractMatchRangeList } from './utils';
+
 const HTML_TAG_REGEX = /(<!--[\s\S]*?-->)|(<[^>]*>)/g;
 
 export const useCheckIsHtmlTag = (text: string) => {
   const htmlTagMatchList = text.matchAll(HTML_TAG_REGEX);
-  const htmlTagRangeList = getHtmlTagRangeList(htmlTagMatchList);
+  const htmlTagRangeList = extractMatchRangeList(htmlTagMatchList);
   const reversedHtmlTagRangeList = htmlTagRangeList.reverse();
 
   return (match: RegExpMatchArray) => {
@@ -20,14 +22,3 @@ export const useCheckIsHtmlTag = (text: string) => {
     return isInclude;
   };
 };
-
-const getHtmlTagRangeList = (
-  htmlTagMatchList: IterableIterator<RegExpMatchArray>,
-) =>
-  [...htmlTagMatchList].map(htmlTagMatch => {
-    const startIndex = htmlTagMatch.index!;
-    const [tag] = htmlTagMatch;
-    const { length: tagLength } = tag;
-
-    return [startIndex, startIndex + tagLength - 1];
-  });
diff --git a/packages/text-vide/src/utils.ts b/packages/text-vide/src/utils.ts
new file mode 100644
index 0000000..f74e9b1
--- /dev/null
+++ b/packages/text-vide/src/utils.ts
@@ -0,0 +1,10 @@
+export const extractMatchRangeList = (
+  matchList: IterableIterator<RegExpMatchArray>,
+) =>
+  Array.from(matchList).map(match => {
+    const startIndex = match.index!;
+    const [matchedWord] = match;
+    const { length: matchedWordLength } = matchedWord;
+
+    return [startIndex, startIndex + matchedWordLength - 1];
+  });