Do you keep the same files on your PC, laptop, and external drive — and constantly wonder which copy is the newest? File sync software solves that headache by automatically keeping folders identical across devices, so the latest version is always everywhere you need it.
Whether you want to sync between two computers at home, back up work folders, or share files with family without paying for cloud storage, the free tools below have you covered. Here are the 7 best free file sync software options in 2026.
1. Syncthing — Best Free Private Sync
Syncthing is a free, open-source file synchronisation tool that syncs folders directly between your devices, with no central server in between. Your files are encrypted in transit, and nothing is stored on a third-party cloud. Set it up once on each device, choose which folders to share, and changes propagate automatically. It works on Windows, Mac, Linux, and Android, making it ideal for anyone who values privacy and does not want subscription fees.
2. FreeFileSync — Best for Folder Mirroring and Backups
FreeFileSync is a free, open-source tool for comparing and synchronising folders. It shows you exactly which files will be copied, updated, or deleted before you run a sync, and supports mirror, two-way, and update modes. You can schedule automatic syncs, sync to external drives or network folders, and use batch jobs for routine backups. It is the best choice when you want precise control and a clear preview before anything changes.
3. Resilio Sync — Best for Fast Peer-to-Peer Sync
Resilio Sync (formerly BitTorrent Sync) uses peer-to-peer technology to sync large files quickly between devices, even over the internet. The free personal version covers everyday use: sync folders between your computers and phone, share a folder with family via a secure link, and let it handle large video files without choking. Because transfers go directly between devices, speeds are often faster than cloud services, and there are no storage limits beyond your own disks.
4. SyncBackFree — Best for Scheduled Sync Jobs
SyncBackFree is a free version of the popular SyncBack backup and sync tool. It lets you create profiles for different sync jobs — for example, "Work documents to USB drive every evening" — and run them manually or on a schedule. It supports filters, compression, and email notifications, and it clearly logs every run so you can check what happened. It is a solid, reliable choice for Windows users who like set-and-forget automation.
5. Allway Sync — Best Simple Two-Way Sync
Allway Sync is a free file synchronisation tool for personal use that keeps folders in sync across computers, USB drives, and network shares. Its interface is straightforward: pick a source folder, pick a target folder, and let it keep them matched. It detects changes, handles conflicts sensibly, and can run automatically when a USB drive is connected. If you want sync without a learning curve, Allway Sync is easy to recommend.
6. DSynchronize — Best Portable Sync Tool
DSynchronize is a small, free, portable synchronisation utility that you can run without installing anything — even from a USB stick. It supports two-way sync, scheduled sync, real-time monitoring, and syncing to network folders. It is lightweight and fast, which makes it great for older PCs or for IT users who carry their tools with them. Despite its small size, it handles large folder trees reliably.
7. Nextcloud — Best Free Self-Hosted Cloud Sync
If you want your own private Dropbox, Nextcloud is the answer. This free, open-source platform lets you run a personal cloud server on an old PC, a Raspberry Pi, or cheap web hosting, then sync files to all your devices with its desktop and mobile apps. You control your data, storage limits are set by your own hardware, and you can add calendar, contacts, and notes syncing too. Setup takes a little more effort, but the payoff is a fully private cloud with no monthly bill.
Sync vs Backup: An Important Difference
File sync keeps folders identical everywhere — which means if you delete a file on one device, it may be deleted everywhere. That is convenient, but it is not a backup. For irreplaceable files, use sync plus a proper backup: for example, sync with Syncthing for daily access, and keep a separate backup on an external drive with FreeFileSync in mirror mode. That way a mistake on one device cannot wipe out your only copy.
Frequently Asked Questions
Is free file sync software safe?
Yes, when downloaded from official sources. Tools like Syncthing encrypt transfers and never route your files through a third-party server, while FreeFileSync and SyncBackFree run entirely on your own machines.
Can I sync files without the internet?
Yes. Syncthing, Resilio Sync, and FreeFileSync all work over your local network or directly between devices, so you can sync at home without any internet connection.
What is the difference between sync and cloud storage?
Cloud storage keeps your files on a company's servers, usually with a storage limit and a monthly fee. Peer-to-peer sync tools move files directly between your own devices, with no storage limit beyond your disks and no subscription.
Which free sync tool should beginners start with?
Start with FreeFileSync for simple folder syncing and backups. Move to Syncthing when you want automatic, private syncing between multiple devices.
Conclusion
You do not need a paid cloud subscription to keep your files in sync. FreeFileSync gives you precise, reliable folder syncing, Syncthing gives you private automatic sync across devices, and Resilio Sync handles large files fast. Pick the one that fits your setup, set up your first sync job today, and stop wondering which copy of a file is the newest — they will all be the same.
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