LibreOffice (/ˈliːbrə/)[11] is a free and open-source office productivity software suite, a project of The Document Foundation (TDF).

It consists of programs for word processing; creating and editing spreadsheets, slideshows, diagrams, and drawings; working with databases; and composing mathematical formulae.

Ecosystem partner Collabora uses LibreOffice upstream code and provides apps for Android, iOS, iPadOS, and ChromeOS.

[29][30] There are community ports for FreeBSD,[31] NetBSD,[32] OpenBSD and Mac OS X 10.5 PowerPC[33] receive support from contributors to those projects, respectively.

[39] Historically, predecessors of LibreOffice, dating back to StarOffice 3, have run on Solaris with SPARC CPUs that Sun Microsystems (and later Oracle) made.

In June 2023, Red Hat announced that it will no longer support LibreOffice on future editions of Red Hat Enterprise Linux in order to focus on Wayland support and other priorities towards workstation users.

[48] The Document Foundation, IceWarp, and Collabora announced a collaboration to work on its implementation.

They were later replaced by multiple icon themes to adapt the look and feel of specific desktop environment, such as Colibre for Windows, and Elementary for GNOME.

[88] LibreOffice also ships with a modified theme which looks native on GTK-based Linux distributions.

[92] LibreOffice uses HarfBuzz for complex text layout, it was first introduced in 4.1 for Linux and 5.3 for Windows and macOS.

[96] Since the core of the OpenOffice.org codebase was donated to the Apache Software Foundation, there is an ongoing effort to get all the code rebased to ease future license updates.

The application programming interface for LibreOffice is called "UNO" and is extensively documented.

[103] Members of the OpenOffice.org community who were not Sun Microsystems employees had wanted a more egalitarian form for the OpenOffice.org project for many years; Sun had stated in the original OpenOffice.org announcement in 2000 that the project would eventually be run by a neutral foundation,[104] and put forward a more detailed proposal in 2001.

[105] Ximian and then Novell had maintained the ooo-build patch set, a project led by Michael Meeks, to make the build easier on Linux and because it was difficult to get contributions accepted by Sun, even from corporate partners.

The Document Foundation's initial announcement stated their concerns that Oracle would either discontinue OpenOffice.org, or place restrictions on it as an open source project, as it had on Sun's OpenSolaris.

Since the office suite that was branded "OpenOffice.org" in most Linux distributions was in fact Go-oo, most moved immediately to LibreOffice.

[124] Oracle was invited to become a member of The Document Foundation; however, Oracle demanded that all members of the OpenOffice.org Community Council involved with The Document Foundation step down from the OOo Community Council, claiming a conflict of interest.

[125] The name "LibreOffice" was picked after research in trademark databases and social media and checks to ensure it could be used for URLs in various countries.

[131] In opposition to Shuttleworth's view, the former Sun executive Simon Phipps argued in an article for the same online magazine, that the lay-off was an inevitable business decision by Oracle, not impacted by existence of LibreOffice.

The Document Foundation cited their lack of clear rules and arguments among community members as their reasoning for cancelling the contest.

New major versions are released around every six months, in January or February and July or August of each year.

The initial intention was to release in March and September, to align with the schedule of other free software projects.

[197] As of version 7.1, the open source release of LibreOffice is officially branded as "LibreOffice Community", in order to emphasize that the releases are intended primarily for personal individual use, and are "not targeted at enterprises, and not optimized for their support needs".

The Document Foundation states that usage of the community versions in such settings "has had a two-fold negative consequence for the project: a poor use of volunteers' time, as they have to spend their time to solve problems for business that provide nothing in return to the community, and a net loss for ecosystem companies.