diff --git a/ROADMAP.md b/ROADMAP.md
index 5d14383..cdf3ad7 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -28,7 +28,7 @@
 
 - [x] **多格式查看器** — Text / Hex / Json / Binary / Msgpack / PHP Serialize / Java Serialize / Pickle / Brotli / Gzip / Deflate / DeflateRaw / Protobuf（13 种格式）
 - [x] **自动格式检测** — 检查内容 magic bytes 自动选择查看器
-- [ ] **自定义格式化器** — 外部可执行文件 + 模板参数 {KEY} {VALUE} {HEX} {HEX_FILE}
+- [x] **自定义格式化器** — 外部可执行文件 + 模板参数 {KEY} {VALUE} {HEX} {HEX_FILE}
 - [ ] **ReJson / TairJson 支持** — JSON.GET / JSON.SET / JSON.DEL 编辑
 - [ ] **二进制 key 支持** — [Hex] 前缀输入，hex ↔ buffer 双向转换
 - [ ] **虚拟化滚动** — 大 key 集合（200k+）的性能优化，KeyList 树形视图虚拟化
diff --git a/electron/main/ipc-handlers.ts b/electron/main/ipc-handlers.ts
index 2b08257..7d4d451 100644
--- a/electron/main/ipc-handlers.ts
+++ b/electron/main/ipc-handlers.ts
@@ -264,6 +264,9 @@ export function registerIpcHandlers(): void {
   ipcMain.handle('redis:detectFormat', (_e, value: string) => {
     return redis.detectFormat(value)
   })
+  ipcMain.handle('redis:customFormat', (_e, value: string, command: string, key: string) => {
+    return redis.customFormat(value, command, key)
+  })
 
   // Pub/Sub
   ipcMain.handle('redis:subscribe', async (_e, id: string, channels: string[], isPattern: boolean) => {
diff --git a/electron/main/redis/format.ts b/electron/main/redis/format.ts
index f0c66fb..2a38aab 100644
--- a/electron/main/redis/format.ts
+++ b/electron/main/redis/format.ts
@@ -1,6 +1,10 @@
 // electron/main/redis/format.ts
-// 值格式转换（解压/编码）
+// 值格式转换（解压/编码/自定义）
 import { gunzipSync, inflateSync, brotliDecompressSync } from 'zlib'
+import { execFile } from 'child_process'
+import { writeFile, unlink, mkdtemp } from 'fs/promises'
+import { tmpdir } from 'os'
+import { join } from 'path'
 
 export type FormatType = 'text' | 'hex' | 'json' | 'binary' | 'gzip' | 'deflate' | 'brotli' | 'deflateRaw'
 
@@ -44,3 +48,33 @@ export function detectFormat(value: string): FormatType {
   if (hasNonPrintable) return 'hex'
   return 'text'
 }
+
+export async function customFormat(
+  value: string,
+  command: string,
+  key?: string
+): Promise<string> {
+  const tmpDir = await mkdtemp(join(tmpdir(), 'jrdm-fmt-'))
+  const tmpFile = join(tmpDir, 'value.bin')
+  await writeFile(tmpFile, value, 'utf-8')
+
+  return new Promise((resolve) => {
+    const cmd = command
+      .replace(/\{KEY\}/g, key || '')
+      .replace(/\{VALUE\}/g, value)
+      .replace(/\{HEX_FILE\}/g, tmpFile)
+
+    const parts = cmd.split(/\s+/)
+    const exe = parts[0]
+    const args = parts.slice(1)
+
+    execFile(exe, args, { timeout: 10000, maxBuffer: 10 * 1024 * 1024 }, async (err, stdout) => {
+      await unlink(tmpFile).catch(() => {})
+      if (err) {
+        resolve(`[Custom formatter error: ${err.message}]`)
+      } else {
+        resolve(stdout)
+      }
+    })
+  })
+}
diff --git a/electron/preload/index.d.ts b/electron/preload/index.d.ts
index de003ee..0ee4531 100644
--- a/electron/preload/index.d.ts
+++ b/electron/preload/index.d.ts
@@ -111,6 +111,7 @@ export interface ElectronAPI {
     clearCommandLog: () => Promise<void>
     decodeValue: (value: string, format: string) => Promise<string>
     detectFormat: (value: string) => Promise<string>
+    customFormat: (value: string, command: string, key: string) => Promise<string>
     subscribe: (id: string, channels: string[], isPattern: boolean) => Promise<{ success: boolean; error?: string }>
     unsubscribe: (id: string) => Promise<void>
     onSubscribeMessage: (callback: (msg: any) => void) => void
diff --git a/electron/preload/index.ts b/electron/preload/index.ts
index fc04eb7..a281643 100644
--- a/electron/preload/index.ts
+++ b/electron/preload/index.ts
@@ -135,6 +135,8 @@ const electronAPI = {
       ipcRenderer.invoke('redis:decodeValue', value, format),
     detectFormat: (value: string): Promise<string> =>
       ipcRenderer.invoke('redis:detectFormat', value),
+    customFormat: (value: string, command: string, key: string): Promise<string> =>
+      ipcRenderer.invoke('redis:customFormat', value, command, key),
     // Pub/Sub
     subscribe: (id: string, channels: string[], isPattern: boolean): Promise<any> =>
       ipcRenderer.invoke('redis:subscribe', id, channels, isPattern),
diff --git a/src/components/StringEditor.vue b/src/components/StringEditor.vue
index ec303e0..1e8c5a6 100644
--- a/src/components/StringEditor.vue
+++ b/src/components/StringEditor.vue
@@ -34,8 +34,11 @@ const formatOptions = [
   { value: 'gzip', labelKey: 'editor.formatGzip' },
   { value: 'deflate', labelKey: 'editor.formatDeflate' },
   { value: 'brotli', labelKey: 'editor.formatBrotli' },
+  { value: 'custom', labelKey: 'editor.formatCustom' },
 ]
 
+const customCommand = ref(localStorage.getItem('customFormatter') || '/bin/cat {HEX_FILE}')
+
 const effectiveFormat = computed(() => {
   if (selectedFormat.value === 'auto') return detectedFormat.value
   return selectedFormat.value
@@ -70,6 +73,11 @@ async function decodeAndDisplay(raw: string) {
     }
   }
   // For other formats, use IPC decode
+  if (fmt === 'custom') {
+    displayValue.value = await window.electronAPI.redis.customFormat(raw, customCommand.value, keyStore.selectedKey || '')
+    isJson.value = false
+    return
+  }
   displayValue.value = await window.electronAPI.redis.decodeValue(raw, fmt)
   isJson.value = false
 }
@@ -90,6 +98,8 @@ watch(selectedFormat, () => {
   if (editedValue.value) decodeAndDisplay(editedValue.value)
 })
 
+watch(customCommand, (v) => localStorage.setItem('customFormatter', v))
+
 const editorOptions = computed(() => ({
   readOnly: !isEditing.value || effectiveFormat.value !== 'json' && effectiveFormat.value !== 'text',
   minimap: { enabled: false },
@@ -133,6 +143,13 @@ async function save() {
           :label="t(opt.labelKey)"
         />
       </el-select>
+      <el-input
+        v-if="selectedFormat === 'custom'"
+        v-model="customCommand"
+        size="small"
+        style="width:240px"
+        :placeholder="t('editor.customCommandHint')"
+      />
       <span v-if="selectedFormat === 'auto'" class="format-detected">
         {{ t('editor.format') }}: {{ detectedFormat }}
       </span>
diff --git a/src/i18n/locales/en.ts b/src/i18n/locales/en.ts
index c6575ba..0a5657f 100644
--- a/src/i18n/locales/en.ts
+++ b/src/i18n/locales/en.ts
@@ -141,6 +141,9 @@ export default {
     formatGzip: 'Gzip',
     formatDeflate: 'Deflate',
     formatBrotli: 'Brotli',
+    formatCustom: 'Custom',
+    customCommand: 'Custom Command',
+    customCommandHint: 'Templates: {KEY} {VALUE} {HEX_FILE}',
     consumerGroups: 'Consumer Groups',
     group: 'Group',
     consumers: 'Consumers',
diff --git a/src/i18n/locales/zh-CN.ts b/src/i18n/locales/zh-CN.ts
index abc4d88..5f8e0bd 100644
--- a/src/i18n/locales/zh-CN.ts
+++ b/src/i18n/locales/zh-CN.ts
@@ -141,6 +141,9 @@ export default {
     formatGzip: 'Gzip',
     formatDeflate: 'Deflate',
     formatBrotli: 'Brotli',
+    formatCustom: '自定义',
+    customCommand: '自定义命令',
+    customCommandHint: '模板: {KEY} {VALUE} {HEX_FILE}',
     consumerGroups: '消费者组',
     group: '组名',
     consumers: '消费者',