4Sync Review

4Sync is 4Shared’s attempt at securing its future in the new cloud frontier. But this isn’t another cloud service to ignore. 4Sync has a uniquely powerful feature set that positions it as a truly premium cloud service. But this premium service does come with a somewhat premium price, and still even includes a few unfortunate caveats.

4Sync logo

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User Rating:
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  • Clean UIs and easy to use
  • Impressive sharing options
  • Music streaming and playlists in apps and on web
  • Powerful and customizable syncing software
  • Downloading statistics
  • Sync folders can be installed on network drives
  • Fast uploads and downloads


  • No free option outside of 60-day trial
  • 20 GB file upload limit
  • Limited feature set and no sharing on mobile apps
  • No at-rest file encryption or two-factor authentication
  • HTTPS encryption is initially disabled
  • 1 TB is the only storage option available
  • Only one expensive pricing tier, especially if paid monthly
  • No Linux support

Bottom Line

With an impressive feature set, an extensive array of sharing options, and powerful sync software, 4Sync is a service that’s well worth checking out. But their expensive monthly pricing, file upload limits, lack of storage options, and security and privacy feature holes will turn off some users.


Web UI

4Sync’s web UI is familiar, compact, and well-featured. You can upload, download, share, and move files and folders. The web UI also includes a recycle bin to restore deleted files, a section for files that were shared with you, and an “uncompleted” folder (not shown) which allows you to re-upload files that did not finish uploading.


Uploading and downloading is quick and easy. The ability to get links to the files as they’re uploaded is a nice feature. I will also mention that if you have the sync software installed, downloads will automatically queue in the software instead of downloading through the web browser.

Unfortunately, 4Sync enforces a 20 GB per file upload cap.


4Shared provides a few cool ways to play with your photos, music and videos in the web browser.

Web Music Player

4Sync surprised me by including a pretty nice music player in the browser with support for playlists, skipping, shuffling, and even sharing playlists.

Web Photo Viewer

Beyond that, 4Sync offers a ho-hum but perfectly functional photo and video viewer. You can go forward and back, view a slideshow, and share to various social networks.

Unfortunately, there is no built in viewer for documents, pdfs, etc. These will have to be downloaded.


4Sync’s dizzying array of sharing options is nothing short of impressive.


The standard bevvy of sharing options are available, like links, e-mails, and direct download links. Folders can be shared publically or privately, with no login required for the former and a login required for the latter. Passwords and read/write access can also be configured within the More Sharing options menu.

Website embeds

That menu also offers a ton of other sharing options that are useful especially if you’re promoting content online. 4sync.com custom domains, streaming audio embeds, embedding folders as lists or widgets, and even simple HTML or forum embed codes are all available options.

Desktop Software

Desktop Interface

4Sync’s sync client looks pretty ancient, but it’s surprisingly powerful and responsive. Like other services, the sync client is a folder that mirrors and syncs your cloud storage. But you can choose to select individual folders to exclude from downloads, choose folders not to sync to the cloud, and even choose whether files are deleted locally when the cloud versions are.

The sync folder itself can be installed anywhere locally or even on NAS and network devices.

External Sync Folder

The sync client installs an impressive array of sharing and interaction options in the right click menu, including a “Sync as external folder” option. This is an incredible feature that allows you to pick a folder in your sync folder, move it somewhere else and yet still keep it synced to your cloud, which is useful for those with external or network drives.

Shared folder notification

I also appreciate shared folders will also sync to your client, but the service will ask permission to do so on each occasion.

The sync client is available on Windows and MacOS

Mobile Apps

iOS App Android App Windows Phone

4Sync has mobile apps for iOS, Android, Windows Phone 8.1, Blackberry, and Symbian (last two not pictured). All three apps let you view, upload and download files. They also have music players that will stream under the lockscreen.

iOS Music Player Android Music Player Windows Phone Music Player

Oddly enough, sharing is only an option in the soon-to-be-depreciated Windows Phone app. iOS has no sharing whatsoever, and Android has a share button only in the music player, which is odd for a service with otherwise excellent sharing options.

Security and Privacy

4Sync/4Shared, makes a fairly convincing case for being secure, but they’ve still got some curious holes.

First, files are only protected with your username and password. Those credentials are given 128-bit encryption, which makes it harder to breach externally. But it’s odd that they don’t go the extra mile and encrypt at rest.

HTTPS Disabled by default!

Also, there’s no two-factor authentication, and even HTTPS transfer encryption is an initially disabled option that has to be enabled in both the web and the desktop software. There’s no reason why such a crucial security feature should be disabled from the start.


Upload and download speeds were excellent. Once again, I tested on a network that averages at 5 Mbps up and 50 Mbps down with some occasional download spikes.

4Sync Performance
Average Upload Speed 6.22 Mbps
Max Upload Speed 6.30 Mbps
Average Download Speed 57.2 Mbps
Max Download Speed 94.0 Mbps


4Sync only offers one service tier, “Premium.”

For $100 / year or a ludicrously high $17 / month ($204 / year when paid monthly), you get 1 TB of storage, a 20 GB upload limit, and unlimited bandwidth. $100 / year for 1 TB isn’t too bad, but charging double for a monthly subscription seems absurd.


Support options are sparse. You can send e-mails to support through their support page and live support is available from 10 a.m. to 4 p.m. GMT.

More Screenshots


Product Name 4Sync
Operating Systems WindowMac
Storage 1 TB
Monthly Price $17
Average Upload Speed 6.22 Mbps (5 Mbps connection)
Average Download Speed 57.2 Mbps (50 Mbps connection)

General Features

Free Trial yes
Free Online Storage no
Mobile Apps Android, iOS, Windows Phone, Symbian, Blackberry
Bandwidth Controls yes
NAS Support yes

Backup Features

File Versioning yes
Keep Deleted Files Forever
Back Up to Local Drive no

Sync and Share Features

File Sync yes
Selective Sync yes
Public File Sharing yes
Collaborative Invites yes


Encrypted Storage no
Encrypted Transfer yes
Personal Encryption no
Zero-knowledge Encryption no
Two-factor Authentication no


Phone Support no
Email Support yes
24/7 Support no
Live Chat no


Data Center Location(s) United States, Europe

Mike Lohnash

Mike Lohnash

Mike has nurtured a passion for all things tech for over ten years as a hobbyist, retailer, tech supporter, and spreadsheet jockey. He’s been an optimistic evangelist for the power of the cloud since the days of server-aided file sharing. In his spare time he loves reading and writing about faraway lands, playing games within them, and has a slightly unhealthy obsession for Star Wars.

Mike Lohnash

Mike Lohnash

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