The Communication Gap
In an era of increasing cyber-surveillance, financial institutions, law firms, and enterprises face a critical hidden vulnerability. While core systems are hardened, the transmission of sensitive documents — KYC files, board minutes, SWIFT instructions, legal briefs — still travels through insecure channels.
This creates Shadow IT risks, data sovereignty violations, and forensic blind spots that regulators increasingly scrutinize. One intercepted document can unravel years of compliance work.
Three pillars of sovereign security
Zero-Knowledge
Encryption happens on your device before data touches the network. We move your files — we can never read them. Keys exist only in the URL fragment, never on our servers.
Ephemeral Vaulting
Data liability is time-boxed. Encrypted assets self-destruct after your chosen window — 24 hours, 48 hours, or 7 days. Secure transfer with zero long-term footprint.
Audit Ledger
Every action is stamped and logged. A complete chain of custody for compliance officers and regulators — event-level traceability without content visibility.
ECB-Linked
Live European Central Bank exchange rates displayed via Frankfurter API. Built for cross-border institutional use from day one.
PWA — No App Store
Install directly from your browser on any device. No app store approval. No tracking. Works offline after first load. One tap to install on iOS and Android.
eXstnZ Integration
Files sent via Convis can be stored permanently in the eXstnZ Sovereign Vault — 100-year institutional storage with the same zero-knowledge architecture.
Built for institutional scale
Send legal briefs, database dumps, 4K evidence files, medical records — everything standard systems refuse, with encryption standard systems cannot match.
Three steps. That's it.
Choose Your Username
Enter any username — no email, no password, no registration. Your identity is stored locally. Free tier gives you 5 transfers up to 5 MB each immediately.
Drop Your File
Drag any file into the upload zone or tap to select. AES-256-GCM encryption is applied instantly in your browser. The file is encrypted before it leaves your device.
Share the Secure Link
Copy the generated link and send it to your recipient by any channel. They click it, it decrypts in their browser. No account needed on their side. Link self-destructs on schedule.