5sync is simple, private cloud storage. No tracking. No AI training on your data. Just sync.
Powerful privacy tools in a clean, simple interface.
Your files are encrypted before they leave your device. We can't see them. Nobody can.
Changes propagate across all your devices in seconds. Work anywhere, always up to date.
Share any file with a link. Add passwords, set expiry dates, track downloads.
Every edit creates a new version. Roll back to any point in time.
Build integrations with our simple, well-documented API. Upload, sync, share programmatically.
Estonian company, EU servers, strict European data protection. GDPR isn't a checkbox ā it's how we operate.
Protect your account with TOTP apps or hardware keys. Security shouldn't be optional.
Our desktop and mobile apps are fully open source. Audit the code yourself.
Three steps to private file storage.
Create an account in 30 seconds. No credit card needed.
Drop files in your 5sync folder or use the API. Everything encrypts automatically.
Send secure links. Invite team members. Stay in control.
No hidden fees. Cancel anytime.
Zero-knowledge means we have no ability to read your files. They're encrypted on your device using keys that only you control. Even if someone compelled us to hand over data, all they'd get is encrypted blobs that are mathematically impossible to decrypt without your key.
Estonia is the world's most advanced digital society ā the country that built X-Road, pioneered e-Residency, and runs its entire government on secure digital infrastructure. It has strong EU privacy protections and a deep culture of digital rights. Our servers are in Tallinn, operated by certified data center providers. Estonian law requires a court order for any data disclosure, and we always notify you when legally possible.
Absolutely. When you create a share link, anyone with the link can access the file ā no account needed. You can add a password, set an expiry date, and disable downloads if you want more control.
You'll get a notification at 90% capacity. Once full, you can't upload new files, but everything you've stored remains accessible. Free up space or upgrade your plan at any time ā it takes seconds.
Yes. Our desktop and mobile applications are published under the AGPL-3.0 license on GitHub. You can audit the code, build from source, and verify that our encryption works exactly as we claim.
You own your data and can export it anytime. Use the desktop app to download everything, or use our API for bulk exports. If you close your account, we give you 30 days to retrieve your files before they're permanently deleted.