Flutter Web Download File |best| May 2026

If you need a solution that works on Web, Android, and iOS with the same code, the file_saver package is the industry standard. It abstracts away the anchor element logic on web and uses platform-specific file pickers on mobile.

Flutter Web doesn't provide a direct "save to disk" API like mobile or desktop because of browser security sandboxing. Instead, you must leverage web-native techniques to trigger a download. flutter web download file

Developers who want a single API for multi-platform apps. If you need a solution that works on

import 'dart:js_interop'; import 'package:web/web.dart' as web; void downloadFile(List bytes, String fileName) // 1. Create a Blob from the bytes final blob = web.Blob([bytes.toJS].toJS); // 2. Generate a temporary URL for the Blob final url = web.URL.createObjectURL(blob); // 3. Create a hidden anchor element final anchor = web.document.createElement('a') as web.HTMLAnchorElement; anchor.href = url; anchor.download = fileName; // 4. Programmatically trigger the click to start download anchor.click(); // 5. Clean up the URL to free memory web.URL.revokeObjectURL(url); Use code with caution. 2. Using the file_saver Package (Cross-Platform) Instead, you must leverage web-native techniques to trigger