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File selected
Choose the document, photo, archive, or backup you want to protect.
Zero-knowledge encrypted cloud storage
Your files are nottraining data.
ShieldFive encrypts your files before they leave your device, so even we can’t read them.Privacy is not a promise. It is system design.
Client-side encryption · Zero-knowledge · No AI training · EU-hosted
Architecture check
Ciphertext onlyEncrypted before upload
Server receives unreadable ciphertext
Key stays with you
No plaintext. No training data. No backdoor access.
20 GBFree to start — no card required
100%Open-source crypto
0Readable files on our servers
5Open protocols — no lock-in
What this is
Cloud storage where the platform is locked out.
ShieldFive stores encrypted data, not readable files. Your browser encrypts the file first. The server receives ciphertext. Without your key, the file is meaningless.
02
Encrypted locally in browser
Encryption runs on your device before network transfer begins.
03
Ciphertext uploaded
The upload contains encrypted bytes, not readable file contents.
04
Stored encrypted
ShieldFive stores ciphertext only, separated from the key needed to open it.
05
Decrypted only on your device
Opening a file requires your key and happens back on your device.
Encrypted before upload. Ciphertext only.
The problem
Most cloud storage still depends on access.
Server-side access exists for features.
Most cloud storage providers retain server-side access for indexing, sync, security scanning, previews, integrations, or compliance.
Readable files create AI exposure.
When a platform can process plaintext, privacy depends on settings, contracts, and future policy choices.
Promises are weaker than architecture.
If the provider can read a file, users must trust that access will never be expanded, misused, or compelled.
Reality check
If plaintext exists on a server, someone can ask for it.
ShieldFive is designed so our servers never receive plaintext in the first place.
Comparison
Compare the architecture, not the marketing.
Encrypted storage is a spectrum. The important question is who can access file contents, filenames, and keys by design.
Feature
Typical cloud storage
Encrypted cloud storage
ShieldFive
Files encrypted before upload
Usually no
Often yes; varies
Yes, in browser
Provider can read file contents
Possible by design
Usually no; varies
No plaintext access
Metadata/filenames protected
Often visible
Varies by provider
Encrypted client-side
AI training exposure
Policy/access-based
Reduced; varies
No plaintext available
Key ownership
Provider-managed
Often user-controlled
User key only
Privacy basis
Policy and access controls
Cryptography plus policy
Zero-knowledge by design
~ = varies by provider, plan, or policy. Always verify the current provider documentation before choosing a storage product.
Create your private vault
Start free, then upgrade only when you need more private storage.
Local encryption demo
Proof you can feel. Not theater.
Drop a file to run a real browser encryption demo. Nothing is uploaded. Large files are sampled locally for speed; the production vault uses streaming encryption for full uploads.
Drop a file to encrypt it locally
or click to browse · runs in your browser · nothing is uploaded
Create your private vault
The real product applies this principle to your cloud storage workflow.
The five protocols
Privacy isn't a setting. It's the architecture.
Five product rules keep the promise simple: encrypt before upload, hide metadata where possible, reduce crawler exposure, keep user rights intact, and sell storage instead of data.
Design constraints
The list most cloud companies avoid publishing.
These are not marketing promises. They are product constraints created by client-side zero-knowledge encryption.
We cannot read your files
Your browser encrypts before upload. ShieldFive stores ciphertext and does not receive the key needed to read it.
Encrypted before upload
We cannot train AI on your files
AI systems cannot train on plaintext we never receive. No plaintext. No training data.
Ciphertext only
We cannot recover your files if you lose your key
Zero-knowledge means support cannot bypass your password or recovery phrase. Keep them somewhere safe.
User-held key
We cannot silently change the architecture
The product promise depends on client-side encryption. Removing it would change the product users signed up for.
Architecture promise
Even under a valid legal order, we can only produce what we possess: ciphertext. See our Terms →
Proof over promises
A system where even ShieldFive cannot read your files.
We cannot decrypt your files
Encryption happens before upload. Our servers receive ciphertext and do not receive the key needed to reverse it.
No recovery backdoor
If you lose your password or recovery phrase, we cannot reset our way into your files. That is the tradeoff that makes zero-knowledge real.
Breaches expose ciphertext
A server breach should not reveal readable files, because readable files are not what ShieldFive stores.
Create your private vault
Start with 20 GB free and test the workflow yourself.
Why it matters
No plaintext.
No training data.
// client encrypts before upload
// server stores ciphertext only
// ShieldFive cannot read your files
That's not a slogan. That's the architecture.
Access control
Share files that only open in the right country.
Set a country allowlist on any shared link. A confidential document shared with your Paris office won't open in Singapore. A client file stays within the EU. Access control that follows jurisdiction — not just a password.
Combine with expiry dates and download caps. Every shared link is zero-knowledge — recipients decrypt on their device only. We never see the contents of what you share.
// Share link · active restrictions
Allowed countries
DEFRNL+ EU
Expires
7 days
Downloads
5 max
Encrypted
E2E ✓
Access log
→ SG · blocked · not in allowlist
→ FR · granted · decrypting on device
→ DE · granted · decrypting on device
Built seriously
Built by a security-focused engineer because private files should not depend on corporate promises.
Zero-knowledge architecture · Client-side encryption · EU-hosted storage
Design commitments
Readable file accessNot held by ShieldFive
AI training materialNo plaintext available
Recovery backdoorNone
Business modelPrivate storage plans
Use cases
For files your provider should not read.
Legal
Contracts, case notes, and privileged client material.
Finance
Tax records, payroll files, invoices, and private balances.
Creative work
Drafts, assets, pitch decks, and unreleased project files.
Personal
IDs, family photos, backups, health records, and private archives.
Create your private vault
Private storage for work files, personal records, and anything you want kept out of training sets.
Pricing
Pay for storage. Never for your privacy.
Start free. Upgrade when you need more private storage.
Start free. Keep your first files private.
Use 20 GB private storage with no card required. Upgrade when you need more room.
Starter
For a focused private vault you control.
€2.99/mo
Billed monthly
500 GB private storage
- Encrypted storage for core documents
- Secure links with limits
- Email support
Most popular
Shield+
Serious private storage for everyday files.
€7.99/mo
Billed monthly
2 TB private storage
- 2 TB for active files and media
- Advanced sharing controls
- Priority support
Pro
For larger archives, client work, and private backups.
€14.99/mo
Billed monthly
5 TB private storage
- 5 TB for professional files
- Brandable share links
- Priority support
FAQ
The questions worth asking.
Direct answers about access, AI exposure, breaches, recovery, metadata, and provider differences.
Start private
Stop your files from becoming
training data.
Even ShieldFive cannot read them. Encrypted before upload.
20 GB free · No credit card · Zero-knowledge encryption · EU storage