Encrypt locally
Every document is encrypted with AES-256-GCM directly on your phone. The key is derived from your secret phrase using PBKDF2.
Local AES-256-GCM encryption
Your mobile documents in KnoXia. Encrypted. Forever.
Your mobile document vault. Maximum-level security right in your pocket: 100% free, serverless and tracking-free. Your files never leave your phone.
- No account required
- No ads
- 100% offline
Vault locked
My documents
PDF
PNG
PDF
JPG
AES-256-GCM · PBKDF2
How it works
Three steps to complete privacy
No complex setup. Encryption happens on your device before anything is stored.
Store securely
Your files remain in a local vault whose combination only you know. Without your secret PIN, the data is unreadable, even if the device is stolen.
Access anywhere
View your documents anywhere, even offline. With Premium, synchronise them securely across all your devices.
Free or Premium
The same protection, one extra benefit… add peace of mind!
The free plan is complete and entirely local. Premium adds encrypted cloud backup and synchronisation.
Free
0 €forever
Local encryption, no account, no server. Ideal for your personal, confidential and financial documents.
- Local AES-256-GCM encryption
- PBKDF2 key derivation
- No file limit
- No ads, no tracking
- No account required
Premium
Premium
from €4.99depending on duration
Everything in Free, plus end-to-end encrypted cloud backup and secure cross-device synchronisation.
- Everything included in Free
- Encrypted cloud backup
- Protocole TLS 1.3
- Zero-knowledge architecture
- Multi-device synchronisation
Premium pricing
Straightforward subscriptions, no hidden renewal
Choose the duration that suits you. The longer the commitment, the lower the monthly cost.
3 months
4,99 €
just €1.66 / month
- Encrypted cloud backup
- Zero-knowledge · TLS 1.3
- Multi-device synchronisation
6 months
7,99 €
just €1.33 / month
- Encrypted cloud backup
- Zero-knowledge · TLS 1.3
- Multi-device synchronisation
12 months
11,99 €
just €1.00 / month — save 40%
- Encrypted cloud backup
- Zero-knowledge · TLS 1.3
- Multi-device synchronisation
- Early access to new features
Technical security
Cryptography, explained simply
We use proven standards relied on by organisations and companies with the most demanding privacy and security requirements.
Here is what specifically protects your files:
AES-256-GCM
The benchmark symmetric encryption. The GCM variant guarantees both confidentiality and integrity: an encrypted file cannot be altered without detection.
Dérivation PBKDF2
Your secret phrase is turned into an encryption key through hundreds of thousands of iterations (600,000). A brute-force attack becomes extremely costly.
TLS 1.3
For Premium cloud backup, every transfer uses the newest and fastest transport protocol, designed to resist interception.
Zero-knowledge architecture
Keys never leave your device. Even our servers only store encrypted data: we cannot read your documents.
End-to-end encryption
Content is encrypted at the source and decrypted only on your authorised devices. Nobody in between can access it.
Verifiable security
Open, documented standards, with no opaque proprietary mechanism. Trust is built on transparency, not promises.
Frequently asked questions
What you are probably wondering
Is the app really free?
Yes, 100%. Local encryption requires neither a server nor an account. No ads, no file limit.
What happens if I lose my phone?
Without Premium, your data stays only on the device: it disappears with it, but remains unreadable to anyone else. With Premium, encrypted backup lets you restore everything.
Can KnoXia read my documents?
No. A zero-knowledge architecture means that even KnoXia cannot access your encrypted data. The keys stay with you.
How secure is AES-256-GCM?
AES-256-GCM is high-grade encryption used by official organisations and financial companies to protect sensitive data.
What is the difference between Premium and Free?
Free is entirely local and free of charge. Premium adds secure cloud backup and synchronisation across several devices.
Take back control of your data
Start protecting your documents today. Free forever, with Premium options available.
The KnoXia app is available only as a Progressive Web App. Install it on your phone’s home screen and it works just like a native mobile app, without the drawbacks. You will find KnoXia in your list of installed apps and manage it in exactly the same way. Open KnoXia by tapping its icon on your screen.
By choosing the PWA format, KnoXia gives you complete independence from traditional app stores, real-time app updates and fully offline operation.
