In 2024, I had 8 GB of family photos to secure without spending money. I tested five free-tier encrypted cloud services under real conditions: uploading from a Pixel 7 on a 200 Mbps WiFi connection, recovering files from a Linux laptop, and sharing an album with my wife from iOS. Here's what I learned — and what generic roundups won't tell you.
30-second verdict: the zero-knowledge free tier podium
For maximum real free storage: Mega.nz (20 GB, E2E by default, no credit card required).
For the best jurisdiction + open-source: Filen (10 GB, AES-256-GCM + RSA-OAEP, Germany GDPR, client code public on GitHub).
For integrated ecosystem: Proton Drive (5 GB shared with Proton Mail/Calendar/VPN, Switzerland, native zero-knowledge).
Key fact to know: pCloud offers 10 GB free, but this is NOT zero-knowledge on the free tier. Client-side encryption (Crypto Folder) costs $4.99/month extra.
Why free tiers actually matter
Testing before paying isn't trivial. Encrypted cloud services have wildly different UX: upload speed, desktop client stability, file sharing flow, offline mode. Discovering a poorly designed interface after paying for a lifetime license is painful.
Three user profiles for whom a zero-knowledge free tier is the right entry point:
Students: 5 to 10 GB covers administrative documents, course PDFs, internship notes. Zero-knowledge protects sensitive academic research without any budget.
Beginner journalists: protection of sources, investigation notes, drafts. Proton Drive or Filen free tier lets you start without financial commitment, with real legal protection through Swiss or German jurisdiction.
Transitioning users: moving from Google Drive or Dropbox to a private cloud. The free tier lets you test the workflow for 30 to 60 days before full migration.
Comparison table: 7 services × 8 criteria
| Service | Free quota | True E2E / ZK | Encryption | Jurisdiction | Mobile apps | File sharing | Bandwidth cap | Referral bonus |
|---|---|---|---|---|---|---|---|---|
| Mega.nz | 20 GB | Yes (E2E AES-128) | AES-128 CBC | New Zealand (5 Eyes) | iOS + Android | Yes | ~5 GB/month | Up to 50 GB |
| Filen | 10 GB | Yes (AES-256-GCM + RSA-OAEP) | AES-256 + RSA | Germany (GDPR) | iOS + Android | Yes | None published | No |
| Proton Drive | 5 GB | Yes (AES-256 + OpenPGP) | AES-256 | Switzerland (non-EU) | iOS + Android | Yes | None published | No |
| Internxt | ~1-10 GB* | Yes (AES-256 + Reed-Solomon) | AES-256 | Spain (EU) | iOS + Android | Limited | None published | Up to 10 GB |
| Sync.com | 5 GB | Yes (AES-256 + RSA-2048) | AES-256 | Canada (5 Eyes) | iOS + Android | Limited | None published | No |
| pCloud | 10 GB | No (Crypto add-on is paid) | AES-256 server-side | Switzerland | iOS + Android | Yes | None published | Up to 20 GB |
| Tresorit | None | Yes (E2E) | AES-256 | Switzerland | iOS + Android | — | — | — |
*Internxt: variable quota. Dropped from 10 GB to 1 GB in 2024 with referrals up to 10 GB. Verify at internxt.com.
Top 3 zero-knowledge free tiers: why this podium
1. Filen 10 GB — optimal technical balance
What convinced me about Filen in testing: upload speed. On my 200 Mbps connection, Filen uploaded at 38-42 Mbps sustained — better than Proton Drive (26-31 Mbps on the same files). The desktop client is stable and the code is open-source on GitHub, publicly auditable.
AES-256-GCM + RSA-OAEP is the most robust scheme in this comparison. German jurisdiction means the strictest GDPR enforcement in Europe. For someone starting from zero and wanting the best technical protection without paying: Filen is the clear choice.
Real limitation I found: no photo preview as fluid as Google Photos or even Proton Drive. The mobile UX is functional but not as polished as Proton's.
Deep dive: Filen Review 2026 — full 4-month test.
2. Mega.nz 20 GB — the most generous quota on the market
20 GB free, no credit card, E2E by default. This is objectively the best free tier by volume. My real experience: my 8 GB of family photos fit on a single Mega account, with album sharing working smoothly to iOS with no friction.
Real caveats: New Zealand jurisdiction (5 Eyes) is the least favorable of the three. In 2022, ETH Zurich researchers identified cryptographic vulnerabilities (since patched). And the monthly bandwidth cap (~5 GB of free downloads) can surprise you if you frequently access large files from multiple devices.
For "family photo storage + administrative documents" use case, Mega is perfectly defensible. For journalistic or medical data: Proton or Filen.
3. Proton Drive 5 GB — the trusted reference
Only 5 GB, but it's Proton. Swiss jurisdiction, brand recognition (10 years of Proton Mail), integrated ecosystem (the 5 GB is shared with Proton Mail — manage it carefully). Most recent independent security audit: 2023.
What I observed in testing: Proton Drive's iOS app is the most polished of the three. Photo previews, shared folders, offline mode — everything works intuitively. If you already use Proton Mail, the Proton Drive free tier is the obvious choice: same account, zero friction.
Limitation: 5 GB disappears fast if you also use Proton Mail (emails and attachments count). Monitor your usage from the Proton dashboard.
Further reading: premium comparison Proton Drive vs Tresorit vs pCloud Crypto.
Special case pCloud: 10 GB free, but NOT zero-knowledge
pCloud deserves its own section because the confusion is widespread in comparisons.
pCloud offers 10 GB free (extendable to 20 GB with referrals). Standard encryption is AES-256 at rest — but pCloud holds the keys. This is not zero-knowledge.
True zero-knowledge at pCloud is called Crypto Folder. It costs $4.99/month or $49.99/year. It's a separate add-on. Without it, pCloud is an excellent secure cloud — but not a zero-knowledge cloud.
Why does this matter? If pCloud receives a legal order or suffers a server-side data breach, your files outside the Crypto Folder can be accessed. With Filen, Proton Drive, or Mega, same scenario = files remain unreadable because only your device holds the key.
For the full pCloud Review 2026, I cover the paid plans where the Crypto add-on becomes very competitive (especially on lifetime).
Real free tier limitations (what nobody tells you)
Inactive account deletion: Mega deletes accounts inactive for 3 months. Proton after 12 months. Filen: no published policy in 2026. Set a monthly calendar reminder.
Limited external sharing: on Sync.com free, file sharing with third parties is limited in number of recipients and duration. Mega's bandwidth cap can block a remote recipient.
No or minimal versioning: free tiers generally don't include version history. If you overwrite a file accidentally, there's no rollback. This is a strong argument for going paid.
Zero priority support: with a free account, you're not a priority. For a recovery emergency, count on community help (Proton forum, Filen Discord, Mega community support).
Limited scalability: the free tier won't keep up if you start generating regular work files. Rule of thumb: when you regularly hit 70-80% of free quota, it's time to evaluate upgrading.
When to go paid: 4 concrete signals
Signal 1: quota near saturation — you regularly approach 80% of the free tier. Solution: pCloud Premium 2 TB lifetime (~$399, best ROI at 5-7 years) or Proton Drive 200 GB at $3.99/month.
Signal 2: professional sharing — you share files with clients or colleagues regularly. Free tiers aren't designed for this. Sync.com Solo Personal ($15/month, 2 TB, unlimited sharing) or pCloud Business.
Signal 3: intensive multi-device — you access from 4+ devices (laptop, mobile, tablet, desktop). Some free tiers limit the number of devices synced simultaneously. Check the terms before getting locked out.
Signal 4: critical data — once you're storing real professional data (contracts, client data), the free tier lacks the SLA, support, or legal guarantees needed. Here, Tresorit Business remains the benchmark — see our best encrypted cloud storage 2026 full comparison.
pCloud Premium 2 TB — proven 5-year ROI
From free 10 GB to lifetime 2 TB: the most cost-effective upgrade in encrypted cloud
Further reading
- Best encrypted cloud storage 2026 — full pillar comparison: all paid plans, advanced criteria
- Filen Review 2026: in-depth 4-month test
- Internxt Review 2026: Spanish open-source zero-knowledge
- Sync.com Review 2026: Canadian E2E cloud, 6-month test
- Proton Drive vs Tresorit vs pCloud Crypto: the Swiss premium showdown
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