diff --git a/assets/electron/template/app/src/handlers/steam/saveScreenshot.js b/assets/electron/template/app/src/handlers/steam/saveScreenshot.js
new file mode 100644
index 0000000..193a9d7
--- /dev/null
+++ b/assets/electron/template/app/src/handlers/steam/saveScreenshot.js
@@ -0,0 +1,66 @@
+import { handleSteamRequest } from './utils.js'
+import { writeFileSync, unlinkSync, mkdirSync, rmdirSync } from 'node:fs'
+import { join } from 'node:path'
+import { tmpdir } from 'node:os'
+import { randomUUID } from 'node:crypto'
+
+/**
+ * Save screenshot from base64 data URL to Steam library
+ * @param {Omit<import('@pipelab/steamworks.js').Client, "init" | "runCallbacks">} client
+ * @param {Object} json
+ * @returns {Promise<number>} The screenshot handle
+ */
+const saveScreenshotHandler = async (client, json) => {
+  const { body } = json
+  const { dataUrl, width, height } = body
+
+  // Validate input
+  if (!dataUrl || typeof dataUrl !== 'string') {
+    throw new Error('dataUrl is required and must be a string')
+  }
+
+  if (!dataUrl.startsWith('data:image/')) {
+    throw new Error('dataUrl must be a base64 data URL (data:image/...)')
+  }
+
+  // Extract base64 data
+  const matches = dataUrl.match(/^data:image\/(\w+);base64,(.+)$/)
+  if (!matches) {
+    throw new Error('Invalid base64 data URL format')
+  }
+
+  const [, format, base64Data] = matches
+  const buffer = Buffer.from(base64Data, 'base64')
+
+  // Create temp file
+  const tempDir = join(tmpdir(), 'pipelab-screenshots')
+  mkdirSync(tempDir, { recursive: true })
+  const tempPath = join(tempDir, `screenshot-${randomUUID()}.${format}`)
+
+  // Write to temp file
+  writeFileSync(tempPath, buffer)
+
+  // Add to Steam library
+  const handle = client.screenshots.addScreenshotToLibrary(tempPath, null, width, height)
+
+  // Delete temp file after a delay to allow Steam to process it
+  setTimeout(() => {
+    try {
+      unlinkSync(tempPath)
+      rmdirSync(tempDir)
+    } catch {
+      // Ignore cleanup errors
+    }
+  }, 5000)
+
+  return handle
+}
+
+/**
+ * @param {Object} json
+ * @param {import('ws').WebSocket} ws
+ * @param {Omit<import('@pipelab/steamworks.js').Client, "init" | "runCallbacks">} client
+ */
+export default async (json, ws, client) => {
+  await handleSteamRequest(client, json, ws, saveScreenshotHandler)
+}
diff --git a/assets/electron/template/app/src/index.js b/assets/electron/template/app/src/index.js
index fa164ae..e27f970 100644
--- a/assets/electron/template/app/src/index.js
+++ b/assets/electron/template/app/src/index.js
@@ -72,6 +72,7 @@ import steamInstallInfo from './handlers/steam/installInfo.js'
 import steamDownloadInfo from './handlers/steam/downloadInfo.js'
 import steamDownload from './handlers/steam/download.js'
 import steamDeleteItem from './handlers/steam/deleteItem.js'
+import steamSaveScreenshot from './handlers/steam/saveScreenshot.js'
 
 // discord set activity
 import discordSetActivity from './handlers/discord/set-activity.js'
@@ -286,6 +287,21 @@ app.setPath('userData', sessionDataPath)
  */
 const clients = new Set()
 
+/**
+ * @type {import('http').Server | null}
+ */
+let httpServer = null
+
+/**
+ * @type {import('ws').WebSocketServer | null}
+ */
+let wss = null
+
+/**
+ * @type {boolean}
+ */
+let isQuitting = false
+
 /**
  * @param {string} message
  */
@@ -307,7 +323,8 @@ const dir = app.isPackaged ? join(metaDirname, './app') : './src/app'
 const createAppServer = (mainWindow, serveStatic = true) => {
   // eslint-disable-next-line no-async-promise-executor
   return new Promise(async (resolve, reject) => {
-    const server = createServer()
+    httpServer = createServer()
+    const server = httpServer
 
     if (serveStatic) {
       server.on('request', (req, res) => {
@@ -347,7 +364,7 @@ const createAppServer = (mainWindow, serveStatic = true) => {
     }
 
     try {
-      const wss = new WebSocketServer({ server })
+      wss = new WebSocketServer({ server })
       wss.on('connection', function connection(ws) {
         clients.add(ws)
 
@@ -512,6 +529,9 @@ const createAppServer = (mainWindow, serveStatic = true) => {
               case '/steam/workshop/delete-item':
                 await steamDeleteItem(json, ws, client)
                 break
+              case '/steam/screenshots/save':
+                await steamSaveScreenshot(json, ws, client)
+                break
               case '/discord/set-activity':
                 await discordSetActivity(json, ws, mainWindow, rpc)
                 break
@@ -657,9 +677,53 @@ const createWindow = async () => {
   return mainWindow
 }
 
+/**
+ * Cleanup all resources before quitting
+ */
+const cleanup = () => {
+  return new Promise((resolve) => {
+    console.log('Cleaning up resources...')
+
+    // Close all WebSocket clients
+    for (const client of clients) {
+      try {
+        client.close()
+      } catch (e) {
+        console.error('Error closing WebSocket client:', e)
+      }
+    }
+    clients.clear()
+
+    // Close WebSocket server
+    if (wss) {
+      try {
+        wss.close()
+      } catch (e) {
+        console.error('Error closing WebSocket server:', e)
+      }
+      wss = null
+    }
+
+    // Close HTTP server
+    if (httpServer) {
+      httpServer.close(() => {
+        console.log('HTTP server closed')
+        httpServer = null
+        resolve()
+      })
+      // Force resolve after timeout in case server doesn't close cleanly
+      setTimeout(resolve, 500)
+    } else {
+      resolve()
+    }
+  })
+}
+
 const registerHandlers = async () => {
-  ipcMain.on('exit', (event, code) => {
+  ipcMain.on('exit', async (event, code) => {
     console.log('exit', code)
+    isQuitting = true
+    await cleanup()
     app.exit(code)
   })
 }
@@ -708,6 +772,39 @@ app.whenReady().then(async () => {
   })
 })
 
-app.on('window-all-closed', async () => {
-  app.quit()
+app.on('before-quit', (event) => {
+  if (!isQuitting) {
+    event.preventDefault()
+    isQuitting = true
+    cleanup().then(() => {
+      app.quit()
+    })
+  }
+})
+
+app.on('will-quit', () => {
+  // Final cleanup - synchronous operations only
+  // Close any remaining WebSocket clients
+  for (const client of clients) {
+    try {
+      client.terminate() // Force close
+    } catch (e) {
+      // Ignore errors during final cleanup
+    }
+  }
+  clients.clear()
+})
+
+app.on('window-all-closed', () => {
+  // On macOS, apps typically stay open until explicitly quit
+  // But for games, we usually want to quit when the window is closed
+  if (process.platform !== 'darwin' || isQuitting) {
+    app.quit()
+  } else {
+    // On macOS, trigger the quit process which will run cleanup
+    isQuitting = true
+    cleanup().then(() => {
+      app.quit()
+    })
+  }
 })