Cryptomator
✓ Verified by EU AltsClient-side encryption for your cloud files — a German open-source alternative to Boxcryptor.
Overview
Cryptomator is a Bonn, Germany-based European company building open source, privacy, and security software since 2016. As an EU-headquartered provider, Cryptomator likely operates under GDPR. EU Alts has not independently confirmed its exposure to the US CLOUD Act — the ownership and hosting facts recorded for it do not establish that it is outside the Act's reach — see the Details section below for what's known so far.
Why European teams pick Cryptomator
Teams in Europe consider Cryptomator when they want a open source provider that bills in EUR, operating since 2016. Its EU headquarters is a good sign compared with well-known US incumbents, but EU Alts has not independently verified Cryptomator's exposure to the US CLOUD Act — check the Details section for the recorded facts.
See more EU open source tools or browse other startups from Germany.
About
Cryptomator is a German open-source encryption tool that adds client-side, zero-knowledge encryption to any cloud storage service — Dropbox, Google Drive, iCloud, OneDrive, or S3-compatible storage. It creates an encrypted vault that appears as a normal folder; files are encrypted before they leave your device and decrypted only on your device. Cryptomator is developed by Skymatic GmbH in Bonn, Germany, is licensed under LGPL, and is audited by Cure53. It enables EU teams and individuals to use any cloud storage service without trusting the provider with the content of their files — a practical solution for GDPR compliance when using US-based storage that is otherwise convenient or mandated by organisational policy.
Details
- Founded
- 2016
- Headquarters
- Bonn, Germany
- Ownership
- Independently owned (Germany)
- CLOUD Act
- Not independently verified
- Verified
- 2026-07-31
- Last checked
- 2026-07-31
- Company size
- 1–10 employees
Categories
Also from Germany
16 other listed companies are based in Germany. In the same categories as Cryptomator:
Other EU startups like Cryptomator
- Tuta ✓ Verified by EU AltsGermany — End-to-end encrypted email and calendar — a German privacy-first alternative to Gmail.
- Notesnook ✓ Verified by EU AltsGermany — Zero-knowledge encrypted note-taking app — an alternative to Evernote.
- Padloc ✓ Verified by EU AltsGermany — Minimalist, open-source password manager — a German alternative to 1Password.
- Matomo ✓ Verified by EU AltsNew Zealand — Open-source web analytics platform with full data ownership — a GDPR-compliant alternative to Google Analytics.
- Standard Notes ✓ Verified by EU AltsFrance — End-to-end encrypted notes app — a European alternative to Evernote and Notion.
- Tresorit ✓ Verified by EU AltsHungary — End-to-end encrypted cloud storage for teams — a secure European alternative to Dropbox.
Frequently asked questions
What does Cryptomator do?
Cryptomator is client-side encryption for your cloud files — a german open-source alternative to boxcryptor. It is listed under open source, privacy, and security on EU Alts because its core functionality serves teams looking for a European open source tool with EU data residency, typically as a switch away from well-known US incumbents.
Is Cryptomator GDPR compliant?
Cryptomator is headquartered in Bonn, Germany and falls under EU jurisdiction, so it likely processes user data under the GDPR by default. Customer data processing is supervised by Germany's data protection authority, the Bundesbeauftragte für den Datenschutz und die Informationsfreiheit (BfDI). EU Alts has not independently verified Cryptomator's exposure to the US CLOUD Act, so we can't confirm it either way.
How do teams switch from well-known US incumbents to Cryptomator?
Teams considering a move from well-known US incumbents to Cryptomator are usually drawn by its open source workflow fit. EU Alts has not independently verified Cryptomator's exposure to the US CLOUD Act, so treat any CLOUD Act or Schrems II conclusions as provisional. Plan a migration in stages regardless: export your data from the US incumbent, pilot Cryptomator with a small team, then move the rest once integration coverage is confirmed.
Where is Cryptomator based?
Cryptomator is headquartered in Bonn, Germany. The company was founded in 2016. Its main website is https://cryptomator.org.