Built by CERN scientists in Geneva — the same team behind ProtonMail — Proton Drive is the most trustworthy cloud storage product available to regular consumers. Every file is encrypted end-to-end on your device before upload. Even Proton's own engineers cannot access your data. The free plan gives 5GB (shared with ProtonMail), and paid plans include access to the entire Proton ecosystem: VPN, encrypted calendar, and password manager. The iOS and Android apps are polished, the desktop sync client is stable, and the audit logs are public. If you only trust one cloud provider with your most sensitive data, it should be this one.

MEGA offers the largest encrypted free storage tier on the planet at 20GB — no tricks, no hidden activation required. Files are encrypted client-side with AES-128 before upload, and sharing links are end-to-end encrypted by default. The web interface is fast, the desktop sync client is rock solid, and upload/download speeds are genuinely excellent on paid plans. The one real weakness: free-tier users hit monthly bandwidth quotas (roughly 5GB transfer/month) that will pause your access for hours if exceeded. Upgrade to a paid plan and those restrictions vanish entirely. MEGA also offers strong mobile apps with automatic camera backup.

Filen is what you get when privacy-first engineers build cloud storage without corporate pressure: 100% open-source clients (auditable by anyone), zero-knowledge encryption on by default, hosted exclusively in Germany under strict GDPR jurisdiction, and priced more aggressively than both Proton and MEGA. The 10GB free tier is genuinely usable. Paid plans start at just €2.99/month for 100GB — cheaper than most competitors offering less. It's still a smaller team than Proton, which means fewer third-party integrations and a smaller ecosystem, but for pure encrypted storage and sync, it punches well above its weight.

Sync.com is the best privacy-first platform for people who need to share files with others securely. Unlike Proton, which is primarily personal storage, Sync.com has built its product around encrypted collaboration: password-protected share links, configurable link expiry dates, download-only or view-only permissions, and detailed audit trails. It's fully HIPAA and GDPR compliant, making it the go-to for healthcare, law, and financial professionals in the US and Canada. The paid plans are generous — 2TB for about $5/month is hard to beat for a zero-knowledge service.

Tresorit is positioned as the premium enterprise-grade zero-knowledge cloud, and it earns that title. Based in Zurich, Switzerland, it holds SOC 2 Type II certification and offers granular admin controls, DRM-protected sharing (recipients can view but cannot download), remote wipe capabilities, and detailed compliance reports. The "free" plan is actually a secure send tool (5GB transfers) rather than cloud storage. Paid plans are the most expensive in this category by far, but if your organization handles regulated data — medical records, legal briefs, financial audits — the compliance coverage is worth every franc.

#11. Google Drive (15GB Free — shared with Gmail + Photos)

The de facto standard for collaborative document work. Google Docs, Sheets, and Slides integrate directly, real-time multi-user editing is best-in-class, and Search in Drive is powered by Google's indexing engine — you can find any file by content keywords. The 15GB free tier sounds generous but fills up fast between Gmail attachments and Google Photos (after June 2021, photos count against the limit). Google actively scans your files for policy compliance and ad targeting context — that's the privacy price you pay.

#12. Microsoft OneDrive (5GB Free — 1TB with Microsoft 365)

OneDrive is deeply embedded in Windows 10/11 — it's the default save location for Desktop, Documents, and Pictures. For Microsoft 365 subscribers, 1TB of storage is included at no extra cost, making it by far the best storage value per dollar if you're already paying for Office. The "Personal Vault" folder adds a second authentication step (2FA) for sensitive files, though it's not true zero-knowledge encryption. Version history (up to 180 days on paid plans) is genuinely excellent for recovering accidentally deleted or corrupted files.

#13. Dropbox (2GB Free — the most disappointing free tier in tech)

Dropbox invented the modern cloud sync experience and it remains technically unmatched in one area: block-level delta sync, which only transfers the changed portions of a file rather than re-uploading the whole thing. For teams sharing large design files, videos, or codebases where small edits happen constantly, the sync speed difference is noticeable. The 2GB free plan is essentially just a demo. Paid plans jump straight to $11.99/month for 2TB, with limited intermediate options. If you're managing a creative team, Dropbox Paper (their collaborative doc tool) and Dropbox Replay (video review) are genuinely well-built.

#14. Apple iCloud Drive (5GB Free — seamless for Apple users)

If you own an iPhone, iPad, and Mac, iCloud Drive is so integrated into the operating system that using anything else requires active effort. Photos, Messages, contacts, calendars, app data, and backups all flow through it automatically. Apple's Advanced Data Protection (released 2022, now fully mature) enables opt-in end-to-end encryption for iCloud backups, photos, and notes — a massive improvement. The 200GB plan at $2.99/month and the 2TB plan at $9.99/month can now be shared with up to five family members, making it exceptional value per person.

#15. Box (10GB Free — enterprise document compliance)

Box is barely used by individuals and deliberately so — it's an enterprise document management platform that happens to have a cloud storage component. The personal free tier gives 10GB but caps individual file uploads at 250MB (a severe constraint). Where Box shines is in corporate environments: granular permission matrices, information governance policies, retention rules, legal hold, e-signature integration (via Box Sign), and over 1,500 third-party integrations. If your IT department runs Box, you live in it daily. Otherwise, there's no compelling reason to choose it over Google Drive or OneDrive for personal use.

A true backup tool, not a sync drive. IDrive backs up your entire PC, Mac, iOS, or Android device — multiple devices under one account. Ideal for disaster recovery. Paid plans include versioned backup history (up to 30 snapshots). Not the right tool for sharing or accessing individual files on the go.

Truly unlimited computer backup for $99/year — no storage cap, no file size limit. Backblaze backs up everything on your hard drive continuously. They also mail you a hard drive with your data for recovery. Not a sync service at all; purely a backup. Unbeatable value for peace of mind against hard drive failure.

B2 is object storage for developers: S3-compatible API, egress-free bandwidth when paired with Cloudflare, and costs roughly 80% less than Amazon S3. Excellent for static website hosting, large media archives, and app backends. Requires technical setup — not for non-developers.

Wasabi competes directly with Amazon S3 at a fraction of the cost: flat rate of ~$6.99/TB/month with absolutely no egress or API request fees. The predictable billing model is its key advantage over AWS. Used by studios, media companies, and SaaS products for scalable storage. Developer/API only — no consumer-facing GUI.

The backbone of the modern internet. Unmatched global availability, 99.999999999% durability, and infinite scalability. Pricing is complex (storage + egress + API calls), but the ecosystem is incomparable. Powers everything from Netflix to GitHub. Built exclusively for developers building applications, not end users.

Not a service — it's open-source software you host on your own server or NAS. Full 100% data sovereignty: your files never leave hardware you control. Supports hundreds of plugins (calendar, video calls, document editing, email). Requires technical setup; managed hosting via Nextcloud providers starts at ~€3/mo.

A formidable privacy-respecting alternative to Google Drive from Swiss provider Infomaniak. 15GB free, includes a built-in collaborative office suite (kSuite), and is hosted exclusively in renewable-energy Swiss data centers. Paid plans are very competitive. Excellent for European users wanting a Google Workspace replacement without the surveillance trade-off.

Norwegian provider operating under strict Nordic privacy laws. Offers genuinely unlimited storage plans (soft-throttled above 5TB) for personal use. Excellent for bulk photo/video archiving. The pricing is reasonable (~€7.99/mo for unlimited), and Norway's jurisdictional protections are among the strongest in Europe outside Switzerland.

Decentralized object storage where files are split and distributed across a global network of independent nodes. Inherently redundant and private by architecture. Developer-focused with an S3-compatible API. 25GB free tier is generous. Costs $0.004/GB/month — dramatically cheaper than S3. Not for general consumers; requires technical integration.

From the makers of NordVPN. Encrypts files locally on your computer via a simple drag-and-drop "locker" interface before syncing them to the cloud. Also functions purely as a local encrypted vault without cloud sync. Solid zero-knowledge implementation; the 3GB free tier is quite small, and paid plans are more expensive than competitors like Filen.io.

Once endorsed by Edward Snowden for its zero-knowledge architecture. Now focused on encrypted backup rather than sync or sharing. Backs up unlimited devices and versions under one plan. No free tier and the UI hasn't been modernized in years, but the security foundation is impeccable for highly privacy-sensitive backup use cases.

A veteran file-hosting platform primarily built for direct download links and public file sharing. No encryption, no sync, no privacy features. The free tier includes ads. Used by forums, Discord communities, and independent creators distributing large files. If your use case is "host a file and share a download link," MediaFire still works fine.

Part of the vast Zoho ecosystem. WorkDrive is a team storage platform with granular role-based permissions, deep integration with Zoho CRM, Books, and Projects, and a built-in office suite. If your company already runs Zoho, adding WorkDrive is seamless. As a standalone choice competing against Google Drive, it falls short in polish and ecosystem breadth.

The 1TB free headline is marketing bait. Uploading a 10GB file takes 2+ hours at the throttled free-tier speed (barely above dial-up). File size is capped at 4GB per upload. The app serves aggressive video ads. Owned by Chinese company Flextech, all data stored on servers under Chinese jurisdiction. No E2EE. Categorically avoid for anything beyond the most casual, non-sensitive use.

Polished UI, unlimited photo backup, fast speeds, and solid integration with Yandex services. The deal-breaker for almost all international users: data is hosted entirely within Russia under Russian jurisdiction, meaning it is subject to Russian law and government access requests. Suitable for Russian domestic users; not recommended for anyone outside Russia handling any data that matters.