ONLYOFFICE The European alternative to Microsoft 365
Open SourceOffice suite with MS Office file format compatibility
* Affiliate link: We receive a commission on purchase, at no extra cost to you.
About ONLYOFFICE
Document editing with native support for Microsoft Office formats. Compared to Microsoft 365, the software offers a choice between cloud and on-premise operation with identical format compatibility.
Highlights
- ✓ Full MS Office compatibility (.docx, .xlsx, .pptx)
- ✓ Real-time collaboration for teams
- ✓ Self-hosted or cloud hosting available
- ✓ Nextcloud & Moodle integration
- ✓ Open source (Community Edition)
Why European?
- → Latvian company, EU data protection and GDPR
- → Self-hosting on own hardware possible (source code on GitHub)
- → Cloud variant uses AWS with selectable EU region (Frankfurt)
- → Alternative to Microsoft 365 with full control via self-hosting
Pricing
Personal free · Business from 8 €/user/month · Enterprise one-time license from 1,200 €
Frequently asked questions about ONLYOFFICE
What is ONLYOFFICE and what is it used for? +
ONLYOFFICE is an online office suite from Latvian Ascensio System SIA based in Riga. The platform offers editors for texts, spreadsheets, and presentations with high compatibility with Microsoft Office formats (DOCX, XLSX, PPTX). Additionally, the suite includes PDF editing, e-book conversion, real-time co-editing, and video calls via Jitsi. ONLYOFFICE can be used as a cloud service, self-hosted, or as a free desktop app.
Does ONLYOFFICE run on European infrastructure? +
ONLYOFFICE is based in Latvia (EU). For its cloud variant, ONLYOFFICE uses Amazon AWS according to its own privacy policy, with selectable regions in Germany (EU), Oregon (USA), and Singapore. Customers who want fully EU-owned infrastructure can self-host ONLYOFFICE on their own hardware; the source code is freely available on GitHub. The platform uses triple encryption (at rest, in transit, end-to-end). The company is subject to EU law.
How compatible is ONLYOFFICE with Microsoft Office? +
ONLYOFFICE natively uses Microsoft Office formats (DOCX, XLSX, PPTX) as the default storage format, making compatibility significantly higher than LibreOffice. Complex documents with macros, formulas, and layout usually remain intact when switching between Office and ONLYOFFICE. ODF formats and PDF are also supported. The editors can be integrated as plugins into Nextcloud, ownCloud, Seafile, and other platforms.
Try ONLYOFFICE
Office suite with MS Office file format compatibility
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Entry verified on 08.05.2026