OmegaT

Free plan LinuxMacWindows

What OmegaT is

OmegaT is a free, open-source translation memory application intended for professional translation work. It helps reuse previous translations with fuzzy matching, match propagation, multiple translation memories, and glossaries that recognize inflected forms. Projects can process multiple files and support more than 30 formats, including LibreOffice and Microsoft Office documents, HTML, XHTML, PO files, and plain text. TMX and XLIFF formats support interoperability with other translation-memory applications, while interfaces connect to machine-translation services. Other listed tools include autocomplete, Unicode, regular-expression searches, custom tags, right-to-left language support, and language-dependent spelling and grammar checking. OmegaT runs on Windows, macOS, Linux, and other systems capable of Java 11, requiring Java Runtime Environment 11 or later. It is licensed under GPLv3, permitting use, modification, and redistribution. The project says it does not collect information or store it online without explicit consent, though configured external services may receive information.

Who it suits

OmegaT suits professional translators who need local translation memories, glossary tools, broad file support, and compatibility with TMX or XLIFF workflows.

What it does well

Free GPLv3 open-source license
Supports more than 30 file formats
Multiple translation memories and glossaries
Runs on Windows, macOS, and Linux
Works with TMX and XLIFF

What to know first

Requires Java 11 or later
Some language checks depend on language
External configured services may receive information
No free trial is listed

Plans

Plan	Billed and limits	Price
OmegaT	Free professional translation memory application · GPL v3	Free

As omegat.org lists them, read 12 Oct 2026. The maker's own page has the final word.

Getting started

Open the OmegaT website
Download the Windows, macOS, or Linux version
Install or provide Java Runtime Environment 11 or later
Choose a download with or without a bundled runtime
Create a translation project and add supported files
Configure glossaries, translation memories, or optional services

Verdict

OmegaT offers a broad, free toolkit for professional translation-memory work across major desktop systems. Its Java requirement and language-dependent checks are the main setup considerations.

Questions

Is OmegaT free?

Yes. The listed OmegaT plan costs nothing and is a free plan under GPL version 3.

Which operating systems does it support?

Downloads are listed for Windows, macOS, and Linux. It can also run on other systems capable of running Java 11.

Does OmegaT require Java?

Yes. It requires Java Runtime Environment version 11 or later. Downloads are available with or without a bundled runtime.

What files can it translate?

It supports more than 30 formats, including LibreOffice and Microsoft Office files, XHTML, HTML, PO files, and plain text.

Can it work with other translation-memory tools?

Yes. TMX and XLIFF support provide compatibility with other translation memory applications.

Is OmegaT open source?

Yes. It is distributed under the GNU General Public License version 3, allowing use, modification, and redistribution.

Facts from OmegaT's own pages

Additional tools: The site lists Unicode support, regex searches, custom tags, right-to-left language support, and spelling and grammar checking whose availability depends on language. · omegat.org, 12 Oct 2026
Documentation: The standard version includes a user manual, and the project provides an online manual, tutorials, and developer contribution documentation. · omegat.org, 12 Oct 2026
File formats: The site says OmegaT supports more than 30 file formats, including LibreOffice and Microsoft Office files, XHTML, HTML, PO localization files, and plain text. · omegat.org, 12 Oct 2026
Glossaries and memories: OmegaT supports user glossaries with recognition of inflected forms and simultaneous use of multiple translation memories. · omegat.org, 12 Oct 2026
Interoperability: OmegaT is compatible with other translation memory applications through formats including TMX and XLIFF, and has interfaces to machine translation services. · omegat.org, 12 Oct 2026
Java requirement: OmegaT requires Java Runtime Environment version 11 or later; downloads are available with or without a bundled runtime. · omegat.org, 12 Oct 2026
License: OmegaT is distributed under the GNU General Public License version 3, which allows users to use, modify, and redistribute it. · omegat.org, 12 Oct 2026
Notarized macOS build: The download page says the macOS version is available only as a notarized version recognized by macOS as published by a known developer and scanned by Apple. · omegat.org, 12 Oct 2026
Online services: When users configure machine translation or team project services, OmegaT says it shares information with those services. · omegat.org, 12 Oct 2026
Operating systems: The download page lists Windows, macOS, and Linux and says OmegaT can run on other systems capable of running Java 11. · omegat.org, 12 Oct 2026
Privacy: OmegaT says it does not collect user information or transmit information without explicit consent, and that it does not store information online. · omegat.org, 12 Oct 2026
Project and audience: OmegaT is maintained by an informal international group of volunteers and is intended for professional translation work. · omegat.org, 12 Oct 2026
Purpose: OmegaT is an open-source translation memory application. · omegat.org, 12 Oct 2026
Support: OmegaT recommends its active, multilingual user group for support and also provides developer, localization, bug, feature request, and documentation mailing lists or trackers. · omegat.org, 12 Oct 2026
Translation features: The site lists fuzzy matching, match propagation, team translations, autocomplete, and simultaneous processing of multiple-file projects. · omegat.org, 12 Oct 2026

Where OmegaT stands on Freedom251

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