diff --git a/src/components/DecodeResultPaper.tsx b/src/components/DecodeResultPaper.tsx
index 3984b0f..9240e76 100644
--- a/src/components/DecodeResultPaper.tsx
+++ b/src/components/DecodeResultPaper.tsx
@@ -9,7 +9,7 @@
  */
 import { Download } from 'lucide-react';
 import { Button } from '@/components/ui/button';
-import { formatFileSize } from '@/utils/base64Converter';
+import { formatBytes } from '@/utils/format';
 import { useI18n } from '@/utils/chromeI18n';
 
 interface DecodeResultPaperProps {
@@ -54,7 +54,7 @@ export default function DecodeResultPaper({
           {t('inferredMimeType')}: {mimeType}
         </span>
         <span className="text-xs text-muted-foreground">
-          {t('decodedSize')}: {formatFileSize(blobSize)}
+          {t('decodedSize')}: {formatBytes(blobSize)}
         </span>
       </div>
 
diff --git a/src/components/__tests__/DecodeResultPaper.test.tsx b/src/components/__tests__/DecodeResultPaper.test.tsx
index 5d089e3..7815226 100644
--- a/src/components/__tests__/DecodeResultPaper.test.tsx
+++ b/src/components/__tests__/DecodeResultPaper.test.tsx
@@ -27,7 +27,7 @@ describe('DecodeResultPaper 组件', () => {
       expect(screen.getByText(/image\/png/)).toBeInTheDocument();
     });
 
-    it('应通过 formatFileSize 渲染文件大小', () => {
+    it('应通过 formatBytes 渲染文件大小', () => {
       render(<DecodeResultPaper {...{ ...defaultProps, blobSize: 1536 }} />);
       expect(screen.getByText(/1\.5 KB/)).toBeInTheDocument();
     });
diff --git a/src/pages/Base64Converter/Base64ConverterSection.tsx b/src/pages/Base64Converter/Base64ConverterSection.tsx
index 469d949..a6f4d96 100644
--- a/src/pages/Base64Converter/Base64ConverterSection.tsx
+++ b/src/pages/Base64Converter/Base64ConverterSection.tsx
@@ -4,7 +4,8 @@ import { useI18n } from '@/utils/chromeI18n';
 import { CopyButton } from '@/components/CopyButton';
 import DecodeResultPaper from '@/components/DecodeResultPaper';
 import { Button } from '@/components/ui/button';
-import { downloadBlob, formatFileSize } from '@/utils/base64Converter';
+import { downloadBlob } from '@/utils/base64Converter';
+import { formatBytes } from '@/utils/format';
 import { useStorageState } from '@/utils/useStorageState';
 import type { Base64ConvertDirection } from '@/types/storage';
 import SwitchButtonGroup from '@/components/SwitchButtonGroup';
@@ -122,7 +123,7 @@ export default function Base64ConverterSection({ mode }: Base64ConverterSectionP
                   {info.name}
                 </span>
                 <span className="text-xs text-muted-foreground/80 font-mono tabular-nums">
-                  {formatFileSize(info.size)} · {info.type}
+                  {formatBytes(info.size)} · {info.type}
                 </span>
                 <span className="text-[11px] font-medium text-primary/80 mt-1">
                   {t('clickOrDropToReplace')}
@@ -190,14 +191,14 @@ export default function Base64ConverterSection({ mode }: Base64ConverterSectionP
                   <span>
                     {t('originalSize')}:{' '}
                     <span className="font-semibold text-foreground/80">
-                      {formatFileSize(result.originalBytes)}
+                      {formatBytes(result.originalBytes)}
                     </span>
                   </span>
                   <span className="text-border/60">|</span>
                   <span>
                     {t('encodedSize')}:{' '}
                     <span className="font-semibold text-foreground/80">
-                      {formatFileSize(result.outputBytes)}
+                      {formatBytes(result.outputBytes)}
                     </span>
                   </span>
                 </div>
diff --git a/src/utils/__tests__/base64Converter.test.ts b/src/utils/__tests__/base64Converter.test.ts
index b252238..95ff976 100644
--- a/src/utils/__tests__/base64Converter.test.ts
+++ b/src/utils/__tests__/base64Converter.test.ts
@@ -7,7 +7,6 @@ import {
   isSupportedImageType,
   isSupportedImageExtension,
   extractMimeTypeFromDataUri,
-  formatFileSize,
   base64ToBytes,
   sniffMimeFromBytes,
   base64ToBlob,
@@ -185,26 +184,6 @@ describe('extractMimeTypeFromDataUri', () => {
   });
 });
 
-describe('formatFileSize', () => {
-  it('应该格式化字节', () => {
-    expect(formatFileSize(0)).toBe('0 B');
-    expect(formatFileSize(512)).toBe('512 B');
-  });
-
-  it('应该格式化 KB', () => {
-    expect(formatFileSize(1024)).toBe('1.0 KB');
-    expect(formatFileSize(1536)).toBe('1.5 KB');
-  });
-
-  it('应该格式化 MB', () => {
-    expect(formatFileSize(1048576)).toBe('1.00 MB');
-  });
-
-  it('应该格式化 GB', () => {
-    expect(formatFileSize(1073741824)).toBe('1.00 GB');
-  });
-});
-
 describe('base64ToBytes', () => {
   it('应该解码标准 ASCII Base64 为字节序列', () => {
     const bytes = base64ToBytes('aGVsbG8=');