Open-source alternatives to Microsoft Office
Looking to replace Microsoft Office with something free and open-source? These 3 tools are the best open alternatives in 2026 — most are self-hostable, so you keep full control of your data and pay no subscription.
At a glance: how they compare
Click a column to sort — the best one depends on what matters to you.
| Alternative | Stars | Language | License | Last commit | In one line |
|---|---|---|---|---|---|
| LibreOffice | — | — | MPL-2.0 | — | Complete free office suite: docs, sheets, slides and more. |
| ONLYOFFICE | — | — | AGPL-3.0 | — | Online office suite with strong MS format compatibility. |
| Collabora Online | — | — | MPL-2.0 | — | Self-hosted collaborative office editing in the browser. |
Which one should you pick?
LibreOffice
Complete free office suite: docs, sheets, slides and more. Its MPL-2.0 license is permissive — free to use commercially, embed and modify.
ONLYOFFICE
Online office suite with strong MS format compatibility. Its AGPL-3.0 license keeps the project and its forks open-source forever, and commercial use is allowed. Because it is self-hostable, your data can stay entirely on your own infrastructure.
Collabora Online
Self-hosted collaborative office editing in the browser. Its MPL-2.0 license is permissive — free to use commercially, embed and modify.
Switching from Microsoft Office without the drama
- Export your data from Microsoft Office first — most tools above can import standard formats.
- Run your top pick in parallel for a week or two before committing; self-hosted options can be tried locally in minutes.
- Migrate one team or one project at a time, keeping the old account read-only until everything checks out.
FAQ
What is the best open-source alternative to Microsoft Office?
The top open-source alternative is LibreOffice — Complete free office suite: docs, sheets, slides and more. The full ranked list is above.
Are these Microsoft Office alternatives free?
Yes. Every tool listed is open-source and free to use; most can be self-hosted so you keep full control of your data.
Can I self-host an alternative to Microsoft Office?
Most of these tools are designed to run on your own server or machine, giving you privacy and no subscription fees.
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