Comparison

LibreOffice vs ONLYOFFICE - Secure Online Office

LibreOffice lands on Worth it, and ONLYOFFICE - Secure Online Office lands on Depends.

LibreOffice

libreoffice.org

Worth it

Confidence: Medium

Buy it if you want a free, private, offline office suite and can tolerate minor Microsoft file-format quirks.

Read the full report

ONLYOFFICE - Secure Online Office

Depends

Confidence: Medium

Buy it if you want a free, self-hosted, MS Office-compatible suite or editors embedded in your own platform.

Read the full report

LibreOffice versus ONLYOFFICE - Secure Online Office
Compare	LibreOffice	ONLYOFFICE - Secure Online Office
Verdict	Worth it	Depends
Best for	Privacy-conscious individuals	Self-hosters
Who it's not for	Teams needing real-time cloud co-editing	Anyone wanting Google Docs zero-setup simplicity
Privacy	Public advisories page; CVEs disclosed and patched through regular releases.^³	Three public CVEs found (2021-2023), one critical; fixed in newer releases . patch promptly.¹⁶
Support quality	Guess: community forums, no vendor SLA	No support evidence in sources
Public sentiment	Users treat it as a genuinely free MS Office replacement that opens most files, with occasional formatting and collaboration trade-offs.^⁶	Self-hosters and Linux users call it a practical, MS-compatible office editor that is good but not perfect.¹²
Biggest gotcha	Old installs carry known RCE and DoS CVEs; update promptly.^³	Self-hosted means you own patching; older versions carry known XSS and critical CVEs

Pick LibreOffice when

Privacy-conscious individuals
Offline, no-cloud document work
Students and nonprofits with no budget
Orgs avoiding US cloud vendors

When LibreOffice is not a fit

Teams needing real-time cloud co-editing
Anyone exchanging complex .docx with strict formatting
Businesses wanting vendor support contracts
Mobile-first users wanting phone/tablet apps

Pick ONLYOFFICE - Secure Online Office when

Self-hosters
Linux users
Developers embedding editors
MS-format-heavy teams avoiding Microsoft

When ONLYOFFICE - Secure Online Office is not a fit

Anyone wanting Google Docs zero-setup simplicity
Orgs already standardized on Microsoft 365
Teams with nobody to patch self-hosted servers
Buyers wanting simple published per-seat pricing

Sources

LibreOffice official sitelibreoffice.org
official
LibreOffice security advisorieslibreoffice.org
security
CVE-2025-1080 detail . SentinelOnesentinelone.com
security
CVE-2025-2866 detail . NVDnvd.nist.gov
security
Ramforum user threadramforum.com
review
Tom's Hardware forum threadforums.tomshardware.com
review
Threads: LibreOffice for offline workthreads.com
review
Switzerland migration away from US techfacebook.com
news
LibreOffice security and development . Help Net Securityhelpnetsecurity.com
news
ONLYOFFICE homepage (official)onlyoffice.com
official
ONLYOFFICE Docs on GitHubgithub.com
official
Self-hosting OnlyOffice for a few months . Redditreddit.com
review
Which Office for Linux is most MS-compatible? . Its FOSS forumitsfoss.community
review
Collabora Online vs OnlyOffice comparisoncollaboraonline.com
review
Buyer prompt seeking Google Docs alternativeparse.gl
review
CVE-2023-30186 critical advisoryechelongraph.io
security