diff --git a/index.html b/index.html
index 5e646088fa..f29d104452 100644
--- a/index.html
+++ b/index.html
@@ -146,6 +146,8 @@ <h3>Utilities</h3>
            <button class="btn tooltip" id="installdefault" data-tooltip="Delete everything, install default apps">Install default apps</button>
            <button class="btn tooltip" id="installfavourite" data-tooltip="Delete everything, install your favourites">Install favourite apps</button>
            <button class="btn tooltip" id="defaultbanglesettings" data-tooltip="Reset your Bangle's settings to the defaults">Reset Settings</button>
+        </p><p>
+           <button class="btn tooltip" id="installappfromfiles" data-tooltip="Install an app by selecting its files">Install App from Files</button>
         </p><p>
            <button class="btn tooltip" id="newGithubIssue" data-tooltip="Create a new issue on GitHub">New issue on GitHub</button>
         </p>
@@ -232,6 +234,7 @@ <h3>Device info</h3>
     <script src="loader.js"></script>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/jszip/3.7.1/jszip.min.js"></script> <!-- for backup.js -->
     <script src="backup.js"></script>
+    <script src="install_from_files.js"></script>
     <script src="core/js/ui.js"></script>
     <script src="core/js/comms.js"></script>
     <script src="core/js/appinfo.js"></script>
diff --git a/install_from_files.js b/install_from_files.js
new file mode 100644
index 0000000000..0f59b1d068
--- /dev/null
+++ b/install_from_files.js
@@ -0,0 +1,142 @@
+/**
+ * Apploader - Install App from selected files
+ * 
+ * This function allows users to install BangleJS apps by selecting files from their local filesystem.
+ * It reads metadata.json and uploads all referenced files to the watch using the standard upload pipeline.
+ */
+function installFromFiles() {
+  return new Promise(resolve => {
+    
+    // Request multi-file selection from user
+    Espruino.Core.Utils.fileOpenDialog({
+      id:"installappfiles",
+      type:"arraybuffer",
+      multi:true,
+      mimeType:"*/*",
+      onComplete: function(files) {
+        try {
+          if (!files) return resolve(); // user cancelled
+          const mapped = files.map(function(f) {
+            return { name: f.fileName, data: f.contents };
+          });
+          processFiles(mapped, resolve);
+        } catch (err) {
+          showToast('Install failed: ' + err, 'error');
+          console.error(err);
+          resolve();
+        }
+      }
+    });
+  });
+}
+
+function processFiles(files, resolve) {
+  if (!files || files.length === 0) {
+    return resolve();
+  }
+
+  const metadataFile = files.find(f => f.name === 'metadata.json' || f.name.endsWith('/metadata.json'));
+
+  if (!metadataFile) {
+    showToast('No metadata.json found in selected files', 'error');
+    return resolve();
+  }
+
+  // Parse metadata.json
+  let app;
+  try {
+    const metadataText = new TextDecoder().decode(new Uint8Array(metadataFile.data));
+    app = JSON.parse(metadataText);
+  } catch(err) {
+    showToast('Failed to parse metadata.json: ' + err, 'error');
+    return resolve();
+  }
+
+  if (!app.id || !app.storage || !Array.isArray(app.storage)) {
+    showToast('Invalid metadata.json', 'error');
+    return resolve();
+  }
+
+  // Build file map for lookup (both simple filename and full path)
+  const fileMap = {};
+  files.forEach(f => {
+    const simpleName = f.name.split('/').pop();
+    fileMap[simpleName] = f;
+    fileMap[f.name] = f;
+  });
+
+  // Populate content directly into storage entries so AppInfo.getFiles doesn't fetch URLs
+  app.storage.forEach(storageEntry => {
+    const fileName = storageEntry.url || storageEntry.name;
+    const file = fileMap[fileName];
+    if (file) {
+      const data = new Uint8Array(file.data);
+      let content = "";
+      for (let i = 0; i < data.length; i++) {
+        content += String.fromCharCode(data[i]);
+      }
+      storageEntry.content = content;
+    }
+  });
+
+  // Populate content into data entries as well
+  if (app.data && Array.isArray(app.data)) {
+    app.data.forEach(dataEntry => {
+      if (dataEntry.content) return; // already has inline content
+      const fileName = dataEntry.url || dataEntry.name;
+      const file = fileMap[fileName];
+      if (file) {
+        const data = new Uint8Array(file.data);
+        let content = "";
+        for (let i = 0; i < data.length; i++) {
+          content += String.fromCharCode(data[i]);
+        }
+        dataEntry.content = content;
+      }
+    });
+  }
+
+  showPrompt("Install App from Files",
+    `Install "${app.name}" (${app.id}) v${app.version}?\n\nThis will delete the existing version if installed.`
+  ).then(() => {
+    // Use standard updateApp flow (remove old, check deps, upload new)
+    return getInstalledApps().then(() => {
+      const isInstalled = device.appsInstalled.some(i => i.id === app.id);
+      
+      // If installed, use update flow; otherwise use install flow
+      const uploadPromise = isInstalled 
+        ? Comms.getAppInfo(app).then(remove => {
+            return Comms.removeApp(remove, {containsFileList:true});
+          }).then(() => {
+            device.appsInstalled = device.appsInstalled.filter(a => a.id != app.id);
+            return checkDependencies(app, {checkForClashes:false});
+          })
+        : checkDependencies(app);
+      
+      return uploadPromise.then(() => {
+        return Comms.uploadApp(app, {
+          device: device,
+          language: LANGUAGE
+        });
+      }).then((appJSON) => {
+        if (appJSON) device.appsInstalled.push(appJSON);
+        showToast(`"${app.name}" installed!`, 'success');
+        refreshMyApps();
+        refreshLibrary();
+      });
+    });
+  }).then(resolve).catch(err => {
+    showToast('Install failed: ' + err, 'error');
+    console.error(err);
+    resolve();
+  });
+}
+
+// Attach UI handler to the button on window load
+window.addEventListener('load', (event) => {
+  const btn = document.getElementById("installappfromfiles");
+  if (!btn) return;
+  btn.addEventListener("click", () => {
+    startOperation({name:"Install App from Files"}, installFromFiles);
+  });
+});
\ No newline at end of file