Your Data, Your Rules: The Best Encrypted Cloud Storage for 2026

In short: If you want cloud storage the provider itself can’t read, look for end-to-end, zero-knowledge encryption. Three services do this well: Proton Drive (Swiss, 5 GB free, the best choice if you also want encrypted email, a VPN and a password manager), Sync.com (Canadian, the most storage for the money, Dropbox-style sharing) and Tresorit (part of Swiss Post, built for professionals, the most expensive per gigabyte). Prices and plan details below were checked on each provider’s website on 20 October 2026.

Think of mainstream cloud storage, like Google Drive or Dropbox, as a glass box. It’s convenient, and the provider can see inside. Your files are encrypted on their servers, but the company holds the keys, so it can scan your files, hand them over when legally required, or expose them if its systems are breached.

An encrypted cloud service works more like a safe deposit box that you lock at home. Files are encrypted on your device before upload, and only you hold the key. The company storing the box has no way to open it.

This isn’t about having “something to hide”. It’s about having something to protect: ID scans, contracts, tax records, client work or simply your family photos. Who gets to see them should be your decision.

What this article covers:

• What “zero-knowledge” encryption actually means
• Proton Drive, Sync.com and Tresorit: plans, prices, strengths and weaknesses
• A side-by-side comparison table
• Why the provider’s country matters
• How to pick the right service for your needs

What does “truly encrypted” cloud storage mean?

Almost every cloud service says your data is “encrypted”. Usually that means encryption in transit (between your device and the server) and at rest (on the server’s disks). That protects you against someone stealing a hard drive from a data centre, but the provider still holds the keys and can decrypt your files whenever it wants or has to.

The standard we’re looking for is end-to-end, zero-knowledge encryption:

• Your files are encrypted on your device before they’re uploaded.
• They travel and are stored in encrypted form.
• The keys needed to decrypt them stay with you; the provider never has them in readable form.

If the provider’s servers are breached, attackers only get scrambled data. If a court orders the provider to hand over your files, it can only hand over that same scrambled data. The trade-off is that the provider can’t reset your encryption for you, so if you lose your password and all recovery options, your files may be gone for good. Set up recovery methods when you create the account.

Proton Drive: encrypted storage inside a privacy suite

Proton Drive comes from Proton, the Swiss company behind Proton Mail, Proton VPN and Proton Pass. Since 2024 its majority shareholder has been the non-profit Proton Foundation. Drive works much like Google Drive, but files and their names are end-to-end encrypted on your device, so Proton can see neither what you store nor what your files are called. Every file is also digitally signed, so nobody can quietly swap or alter its content.

Day to day, you get folders, photo backup from your phone, previews of photos and PDFs in the browser, and sharing with specific people or via public links protected with a password and an expiration date. Proton Docs and Proton Sheets let you write documents and spreadsheets inside Drive, end-to-end encrypted, even on the free plan. Paid plans keep up to 200 versions of each file for up to 10 years. Proton’s apps are open source, and the Drive web and mobile apps were audited by the independent firm Securitum.

Plans (billed yearly): Proton Free with 5 GB, Drive Plus with 200 GB for €3.99 / $3.99 a month, Proton Unlimited with 500 GB plus Mail, Calendar, VPN and Pass for €9.99 / $9.99 a month, and Proton Duo with 2 TB for two users for €14.99 / $14.99 a month. Billed monthly, Drive Plus costs 4.99. All paid plans come with a 30-day money-back guarantee.

Pros:

• Encrypts file names, not just content, and signs every file.
• Docs and Sheets built in, so you don’t have to move documents to Google just to edit them.
• One account for everything: Proton Unlimited bundles storage with encrypted email, VPN and a password manager. We look at whether that’s worth it in our honest look at Proton Unlimited.
• Usable free plan with no time limit.

Cons:

• 5 GB free fills up quickly if you back up photos.
• On the free plan, version history lasts only 7 days.
• Linux has only a command-line tool so far, no desktop app.
• Docs and Sheets can’t yet do everything Google Docs or Microsoft Office can.

For screenshots and a full walkthrough, see our Proton Drive review.

Sync.com: the most storage for the money

Sync.com is a Canadian company based in Toronto. It feels like Dropbox: a sync folder on your computer, mobile apps and a web panel, but with end-to-end encryption. In Sync’s own words, files are “100% private with end-to-end encryption — not even we can see them.”

Sync’s strength is sharing. All paid individual plans include password-protected links, expiry dates, download limits, preview-only links and remote share wipe, plus file history of 90 days (Personal 1TB), 180 days (Solo 5TB) or 365 days (Personal Unlimited). The free plan gives you 5 GB.

Plans (billed yearly, USD): Personal 1TB for $12 a month, Solo 5TB for $28 a month and Personal Unlimited for $45 a month. In October 2026, Sync was offering 25% off the first year ($9, $21 and $33.75 a month), after which plans renew at the regular price. On Personal Unlimited, Sync says upload speed may be managed above 10 TB. There’s a 30-day money-back guarantee.

Pros:

• Lots of storage per dollar, up to an unlimited plan.
• Strong sharing controls on every paid plan.
• Long file history, up to 365 days.
• Familiar if you’ve used Dropbox.

Cons:

• Jurisdiction: Canada has solid privacy law but is a member of the Five Eyes intelligence alliance. End-to-end encryption limits what Sync could hand over, but for people with the highest threat models it’s still a consideration.
• No Linux desktop app. Sync’s desktop app is for Windows and macOS; for Linux, Sync offers only a WebDAV option in early access.
• No built-in document editor, and no wider privacy suite (email, VPN, password manager).
• Regular prices after the first-year discount are noticeably higher.

Tresorit: built for professionals

Tresorit is part of Swiss Post, with offices in Switzerland, Germany and Hungary. It describes its storage as “zero-knowledge end-to-end encryption”, with keys generated on your device, and says it handles data under Swiss privacy law. Tresorit holds ISO 27001:2022 certification, audited by TÜV Rheinland, and signs HIPAA business associate agreements for business customers.

Tresorit is aimed mainly at businesses, but it has three personal plans. All of them include encrypted sharing via links, automatic camera upload, remote device wipe and apps for Windows, macOS, Linux, iOS, Android and the web.

Personal plans (billed yearly): Personal Lite with 50 GB for €3.99 a month, Personal Essential with 1 TB for €9.99 a month and Personal Pro with 4 TB for €23.99 a month. Billed monthly, they cost €4.99, €11.99 and €29.99. There’s no free tier in the personal line-up, only a 14-day trial, and Tresorit asks for payment details up front.

Pros:

• Swiss jurisdiction and a long-established security focus.
• Certifications (ISO 27001) that matter if you handle client data.
• Native Linux app, unlike Proton Drive and Sync.
• Granular permissions and, on Personal Pro, detailed access logs and file requests.

Cons:

• Expensive per gigabyte, especially at the low end: 50 GB on Personal Lite costs as much as 200 GB on Proton Drive Plus.
• Tight limits on cheaper plans: Personal Lite allows 2 devices, a 2 GB maximum file size and keeps 5 previous versions; Essential and Pro allow 10 GB files and 10 or 25 versions.
• No permanent free plan.

Comparison at a glance

Prices are for annual billing as listed on 20 October 2026. Proton uses the same numbers in EUR and USD; Sync lists USD and Tresorit showed EUR prices for our region.

Does the provider’s country matter?

With true end-to-end encryption, the provider can’t read your files no matter where it’s based. The country still matters for everything around your files: account details, payment data, IP addresses and what a court can force a company to do in future, such as changing its software. That’s why some people prefer a provider outside the United States, so the US CLOUD Act doesn’t apply to them directly.

For most people, solid encryption matters far more than jurisdiction. If you’re a journalist, lawyer, activist or anyone else who might be targeted, it’s worth weighing as well, and Proton and Tresorit both operate under Swiss law.

How to choose

• You want a private Google Drive replacement and more privacy tools: Proton Drive. Start free, move to Drive Plus for photo backup, or Proton Unlimited if you also want Proton Mail, VPN and Pass.
• You need lots of storage at a low price and share files often: Sync.com. Just check the regular price you’ll pay after the first year.
• You handle client or regulated data and want certifications and a Linux app: Tresorit, if the price fits.
• You’re still comparing mainstream options: our best cloud storage roundup covers more services, including pCloud.

Whichever you pick, protect the account itself with a strong unique password and two-factor authentication, ideally with a hardware security key. Encryption doesn’t help much if someone can simply sign in as you. If Proton fits your needs best, you can try Proton Drive for free.

Frequently asked questions

What is zero-knowledge cloud storage?

Cloud storage where your files are encrypted on your device before upload and the provider never has the keys to decrypt them. Even the company running the service can’t see your files.

Which encrypted cloud storage has the best free plan?

Proton Drive and Sync.com both offer 5 GB free. Proton’s free plan includes Proton Docs and Sheets; Sync’s is a straightforward sync-and-share account. Tresorit has no free plan, only a 14-day trial.

Is Proton Drive better than Sync.com?

It depends on what you need. Proton Drive encrypts file names, includes document and spreadsheet editors and bundles with Proton Mail, VPN and Pass. Sync.com gives you far more storage for the money and longer file history on its cheaper plans.

Can the provider recover my files if I forget my password?

Not in the way Google or Dropbox can, because it doesn’t hold your keys. Set up recovery methods (for example a recovery phrase at Proton) when you create the account, and store them safely.

Is Tresorit worth the price for personal use?

If you specifically want Swiss jurisdiction, ISO 27001 certification or a native Linux app, it can be. For most individuals, Proton Drive or Sync.com offer more storage for less money.