diff --git a/.changeset/orange-guests-kneel.md b/.changeset/orange-guests-kneel.md
new file mode 100644
index 0000000..fce6bfb
--- /dev/null
+++ b/.changeset/orange-guests-kneel.md
@@ -0,0 +1,5 @@
+---
+'@dolphin/chrome-extension': patch
+---
+
+feat: support encode image as Base64 (< 100 KiB)
diff --git a/apps/chrome-extension/src/common/settings.ts b/apps/chrome-extension/src/common/settings.ts
index c983935..6444dd7 100644
--- a/apps/chrome-extension/src/common/settings.ts
+++ b/apps/chrome-extension/src/common/settings.ts
@@ -11,6 +11,7 @@ export enum SettingKey {
   Grid = 'general.grid',
   TextHighlight = 'general.text_highlight',
   DownloadFileWithUniqueName = 'download.file_with_unique_name',
+  EncodeImageAsBase64 = 'download.encode_image_as_base64',
 }
 
 export enum Theme {
@@ -44,6 +45,7 @@ export interface Settings {
   [SettingKey.Grid]: (typeof Grid)[keyof typeof Grid]
   [SettingKey.TextHighlight]: boolean
   [SettingKey.DownloadFileWithUniqueName]: boolean
+  [SettingKey.EncodeImageAsBase64]: boolean
 }
 
 export const fallbackSettings: Settings = {
@@ -56,6 +58,7 @@ export const fallbackSettings: Settings = {
   [SettingKey.Grid]: Grid.Flatten,
   [SettingKey.TextHighlight]: true,
   [SettingKey.DownloadFileWithUniqueName]: false,
+  [SettingKey.EncodeImageAsBase64]: false,
 }
 
 export const getSettings = async <Key extends keyof Settings>(
diff --git a/apps/chrome-extension/src/pages/options/download.vue b/apps/chrome-extension/src/pages/options/download.vue
index d6da09c..b7840ce 100644
--- a/apps/chrome-extension/src/pages/options/download.vue
+++ b/apps/chrome-extension/src/pages/options/download.vue
@@ -34,6 +34,7 @@ const { t } = useI18n()
 const schema = z.object({
   [SettingKey.DownloadMethod]: z.enum(DownloadMethod),
   [SettingKey.DownloadFileWithUniqueName]: z.boolean(),
+  [SettingKey.EncodeImageAsBase64]: z.boolean(),
 })
 
 const { query, mutation } = useSettings()
@@ -49,6 +50,7 @@ watch(query.data, newValues => {
       values: pick(newValues, [
         SettingKey.DownloadMethod,
         SettingKey.DownloadFileWithUniqueName,
+        SettingKey.EncodeImageAsBase64,
       ]),
     })
   }
@@ -143,6 +145,28 @@ const downloadMethodDescription = computed(() => {
             />
           </Field>
         </VeeField>
+        <VeeField
+          v-slot="{ field, errors }"
+          :name="`[${SettingKey.EncodeImageAsBase64}]`"
+        >
+          <Field orientation="horizontal" :data-invalid="!!errors.length">
+            <FieldContent>
+              <FieldLabel for="form-vee-download-encode-image-as-base64">{{
+                t('download.encode_image_as_base64')
+              }}</FieldLabel>
+              <FieldError v-if="errors.length" :errors="errors" />
+            </FieldContent>
+            <Skeleton v-if="query.isPending.value" class="h-9 w-40" />
+            <Switch
+              v-else
+              id="form-vee-download-encode-image-as-base64"
+              :name="field.name"
+              :model-value="field.value"
+              :aria-invalid="!!errors.length"
+              @update:model-value="field.onChange"
+            />
+          </Field>
+        </VeeField>
         <Button
           type="submit"
           class="relative"
diff --git a/apps/chrome-extension/src/pages/shared/i18n.ts b/apps/chrome-extension/src/pages/shared/i18n.ts
index 5338c0e..666a493 100644
--- a/apps/chrome-extension/src/pages/shared/i18n.ts
+++ b/apps/chrome-extension/src/pages/shared/i18n.ts
@@ -38,6 +38,7 @@ export const i18n = createI18n({
         'Preserve text highlighting (font color, font background color)',
       'download.file_with_unique_name':
         'Use UUID for image and diagram filenames',
+      'download.encode_image_as_base64': 'Encode image as Base64 (< 100 KiB)',
       'download.method': 'Download Method',
       'download.method.placeholder': 'Select download method',
       'download.method.direct': 'Direct Download',
@@ -79,6 +80,7 @@ export const i18n = createI18n({
       'general.grid.to_html': '转换成 HTML',
       'general.text_highlight': '保留文本高亮（字体颜色、字体背景颜色）',
       'download.file_with_unique_name': '图片和图表文件使用 UUID 命名',
+      'download.encode_image_as_base64': '将图片编码为 Base64（< 100 KiB）',
       'download.method': '下载方式',
       'download.method.placeholder': '选择下载方式',
       'download.method.direct': '直接下载',
diff --git a/apps/chrome-extension/src/pages/shared/settings.ts b/apps/chrome-extension/src/pages/shared/settings.ts
index ff01370..4c02bdf 100644
--- a/apps/chrome-extension/src/pages/shared/settings.ts
+++ b/apps/chrome-extension/src/pages/shared/settings.ts
@@ -25,7 +25,8 @@ export const useSettings = <
     | SettingKey.Table
     | SettingKey.Grid
     | SettingKey.TextHighlight
-    | SettingKey.DownloadFileWithUniqueName,
+    | SettingKey.DownloadFileWithUniqueName
+    | SettingKey.EncodeImageAsBase64,
 >(
   options: { keys?: Key[] } = {},
 ): {
@@ -46,6 +47,7 @@ export const useSettings = <
       SettingKey.Grid,
       SettingKey.TextHighlight,
       SettingKey.DownloadFileWithUniqueName,
+      SettingKey.EncodeImageAsBase64,
     ] as Key[],
   } = options
 
diff --git a/apps/chrome-extension/src/scripts/download-lark-docx-as-markdown.ts b/apps/chrome-extension/src/scripts/download-lark-docx-as-markdown.ts
index d9999b9..dc72229 100644
--- a/apps/chrome-extension/src/scripts/download-lark-docx-as-markdown.ts
+++ b/apps/chrome-extension/src/scripts/download-lark-docx-as-markdown.ts
@@ -1,6 +1,12 @@
 import i18next from 'i18next'
 import { Toast, Docx, docx, type mdast } from '@dolphin/lark'
-import { Minute, OneHundred, Second, waitFor } from '@dolphin/common'
+import {
+  Minute,
+  OneHundred,
+  Second,
+  waitFor,
+  blobToBase64,
+} from '@dolphin/common'
 import { fileSave, supported } from 'browser-fs-access'
 import { fs } from '@zip.js/zip.js'
 import normalizeFileName from 'filenamify/browser'
@@ -154,11 +160,17 @@ const downloadImage = async (
     signal?: AbortSignal
     useUUID?: boolean
     markdownFileName?: string
+    encodeImageAsBase64?: boolean
   } = {},
 ): Promise<DownloadResult | null> => {
   if (!image.data) return null
 
-  const { signal, useUUID = false, markdownFileName = '' } = options
+  const {
+    signal,
+    useUUID = false,
+    markdownFileName = '',
+    encodeImageAsBase64 = false,
+  } = options
 
   const { name: originName, fetchSources, fetchBlob } = image.data
 
@@ -174,6 +186,11 @@ const downloadImage = async (
           const content = await fetchBlob()
           if (!content) return null
 
+          if (encodeImageAsBase64 && content.size < 100 * 1024) {
+            image.url = await blobToBase64(content)
+            return null
+          }
+
           const baseName = markdownFileName
             ? `${markdownFileName}-diagram.png`
             : 'diagram.png'
@@ -237,6 +254,11 @@ const downloadImage = async (
               },
             })
 
+            if (encodeImageAsBase64 && blob.size < 100 * 1024) {
+              image.url = await blobToBase64(blob)
+              return null
+            }
+
             image.url = filename
 
             return {
@@ -379,6 +401,7 @@ const downloadFiles = async (
     signal?: AbortSignal
     useUUID?: boolean
     markdownFileName?: string
+    encodeImageAsBase64?: boolean
   } = {},
 ): Promise<DownloadResult[]> => {
   const {
@@ -388,6 +411,7 @@ const downloadFiles = async (
     signal,
     useUUID = false,
     markdownFileName = '',
+    encodeImageAsBase64 = false,
   } = options
 
   let completeEventCalled = false
@@ -423,6 +447,7 @@ const downloadFiles = async (
                       signal,
                       useUUID,
                       markdownFileName,
+                      encodeImageAsBase64,
                     })
                   : await downloadFile(file, {
                       signal,
@@ -549,6 +574,7 @@ const main = async (options: { signal?: AbortSignal } = {}) => {
     SettingKey.Grid,
     SettingKey.TextHighlight,
     SettingKey.DownloadFileWithUniqueName,
+    SettingKey.EncodeImageAsBase64,
   ])
 
   const { root, images, files, tableWithParents, mentionUsers } =
@@ -609,6 +635,7 @@ const main = async (options: { signal?: AbortSignal } = {}) => {
           signal,
           useUUID: settings[SettingKey.DownloadFileWithUniqueName],
           markdownFileName: recommendName,
+          encodeImageAsBase64: settings[SettingKey.EncodeImageAsBase64],
         }),
         // Diagrams must be downloaded one by one
         downloadFiles(diagrams, {
@@ -616,6 +643,7 @@ const main = async (options: { signal?: AbortSignal } = {}) => {
           signal,
           useUUID: settings[SettingKey.DownloadFileWithUniqueName],
           markdownFileName: recommendName,
+          encodeImageAsBase64: settings[SettingKey.EncodeImageAsBase64],
         }),
         downloadFiles(files, {
           onProgress: progress => {
diff --git a/packages/common/src/image.ts b/packages/common/src/image.ts
index 54afd78..3ea8e5c 100644
--- a/packages/common/src/image.ts
+++ b/packages/common/src/image.ts
@@ -24,3 +24,14 @@ export const imageDataToBlob = (
     canvas.toBlob(resolve)
   })
 }
+
+export const blobToBase64 = (blob: Blob): Promise<string> => {
+  return new Promise((resolve, reject) => {
+    const reader = new FileReader()
+    reader.onload = () => {
+      resolve(reader.result as string)
+    }
+    reader.onerror = reject
+    reader.readAsDataURL(blob)
+  })
+}