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Which Cloud Sync Is Free and Actually Reliable?
If you want cloud sync for free, the best choice for most people is Google Drive, with 15 GB shared across Gmail and Photos. OneDrive and iCloud Drive give 5 GB each, and Dropbox Basic gives 2 GB on up to three devices. For unlimited free sync with no provider, Syncthing copies files directly between your own devices.
| Option | Free space | Device limit | End-to-end encryption | Main catch |
|---|---|---|---|---|
| Google Drive | 15 GB, shared with Gmail and Photos | None stated | No | Photos and email fill it |
| OneDrive | 5 GB | None stated | No | Small for photo libraries |
| iCloud Drive | 5 GB | Your Apple devices | With Advanced Data Protection | Also holds iPhone backups |
| Dropbox Basic | 2 GB | Up to 3 devices | No | Smallest free space |
| pCloud Free | Up to 10 GB | None stated | Paid add-on only | Some space unlocked by tasks |
| Sync.com Free | 5 GB | None stated | Yes | No Linux app |
| Syncthing | Unlimited (your own disks) | None | Encrypted device-to-device | Devices must be online together |
| Resilio Sync (free download) | Unlimited (your own disks) | None stated | Encrypted device-to-device | Fewer guides and community fixes |
Limits come from each provider’s site, checked in October 2026. Free plans change often, so confirm before you rely on one.
If you only care about the most free space, see our comparison of free cloud storage. This page focuses on which free options actually sync well.
How We Compared Free Sync Options
We looked at what breaks first on a free plan, because that is when people come to us for fixes:
- Space and what shares it. Google counts Gmail and Photos. Apple counts device backups.
- Device limits. Dropbox Basic stops linking new devices after three.
- Sync behaviour. Whether the free tier gets the same desktop app as paid users.
- Privacy. Who holds the encryption keys.
- Version history. How far back you can restore on a free plan.
Short Verdicts
Google Drive: most free space
15 GB is generous, but in my experience most “Google Drive full” requests come from Gmail attachments and Google Photos, not Drive files. Drive for desktop works the same on free and paid plans.
OneDrive: best free option on Windows
OneDrive is built into Windows, so setup takes minutes. 5 GB fills quickly if you turn on Desktop and Pictures backup. Turn on only Documents if space is tight. See OneDrive free storage for ways to get more.
iCloud Drive: best free option for Apple-only homes
Sync is seamless on iPhone, iPad and Mac. The 5 GB also stores iPhone backups and photos, so it fills fast. Our fix iCloud storage guide shows how to free space.
Dropbox Basic: best sync engine, least space
Dropbox Basic gives 2 GB and three devices. The sync engine is the same as on paid plans and handles conflicts cleanly. It suits a small set of working files.
Get the free sync troubleshooting checklist
One page with the settings and checks that prevent most sync and backup problems, plus alerts when a major service has an outage.
Syncthing: best free option with no limits
Syncthing is free and open source. Files travel directly between your devices over encrypted connections, so there is no storage cap and no provider. The catch is that at least two devices must be online at the same time. Our Syncthing cloud guide covers setup.
Resilio Sync: free peer-to-peer for big files
Resilio Sync now includes features that once needed a paid Pro licence in its free download. It handles large files well and runs on many NAS devices. Read our Resilio Sync review.
Who Each Free Option Suits
- Students and light users: Google Drive for the space.
- Windows office work: OneDrive with Documents backup only.
- iPhone and Mac households: iCloud Drive, with photos optimised.
- A few active project files: Dropbox Basic.
- Large libraries or privacy: Syncthing between a PC and a NAS or second computer.
Limits to Watch on Any Free Plan
- Storage full stops sync. When an account fills, uploads stop silently on some apps. See cloud storage full.
- Short version history. Free plans usually keep about 30 days of old versions or less.
- Inactive accounts. Some providers may delete content from accounts that stay inactive for a long time. Sign in at least once a year.
- No backup. Free sync mirrors deletions. Keep a separate backup; our backup and sync guide explains why.
For a wider comparison, including paid plans, see our file sync tools guide, or start with the basics in our file sync pillar.
Frequently Asked Questions
Which free cloud sync gives the most space?
Google gives 15 GB free, the most among the big three, but Gmail and Google Photos share that space. pCloud offers up to 10 GB, some of it unlocked by completing tasks. If you want no cap at all, Syncthing uses your own disks, so the limit is whatever storage your devices have.
Is free cloud sync safe to use?
Major free plans use the same security as paid plans, including encryption in transit and on servers. The provider still holds the keys on most of them. Turn on two-step verification, avoid storing passwords or ID scans in plain files, and keep a separate backup of anything important.
Can I combine several free cloud accounts?
You can install several sync apps, each with its own folder, and spread files across them. It works but gets messy, and you must remember where each file lives. Never point two apps at the same folder. A free tool like rclone can also manage several accounts from one place.
Does Dropbox Basic really limit me to three devices?
Yes. Dropbox Basic lets you link up to three devices, counting computers, phones and tablets with the app installed. When you reach the limit, unlink an old device in your account settings before adding a new one. The website does not count toward the limit.
Is Syncthing really free?
Yes. Syncthing is free, open-source software with no paid tier. It does not sell storage, because files stay on your own devices. You only need to install it on each computer or phone that should sync. Donations fund development, but every feature is available without paying.
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