Lokalize

Lokalize is a desktop localization tool for KDE and other free and open-source software, with support for computer-aided translation of OpenDocument files. It suits translators working on open-source projects or .odt documents; its strongest case is a free, GPL-licensed workflow with translation memory, terminology management, and QA checks.

Overview

Lokalize is built for software localization rather than general-purpose document editing. Its OpenDocument workflow uses Translate-Toolkit to extract text from .odt files into .xliff files, then merge translated text back into the original document. That gives translators a defined route between document formats and translation work, but it also means the workflow depends on Translate-Toolkit.

The core feature set covers translation memory, terminology management, and quality-assurance checks. Together, these address reuse, consistency, and review in localization work. The desktop deployment is a fit for individual translators and project contributors who want a local tool; it is not a web-based collaboration service.

Key features

• Translation memory: Reuses prior translation work, useful when localizing related software or repeated content.
• Terminology management: Helps keep project vocabulary consistent across translations.
• QA checks: Provides a way to catch issues during translation review.
• OpenDocument support: Translate-Toolkit extracts .odt text into .xliff and merges the translated text back, supporting a document-to-translation workflow.

Pricing

Lokalize is free: its plan is free, for free and open-source software. There is no paid tier to trade against a lower-cost edition, and no free-trial clock or subscription term to manage. That makes it a straightforward option for translators who need the listed desktop localization features without a software fee.

Platforms

Lokalize supports Linux, macOS, and Windows. On Linux, users can install it through Discover and other AppStream stores or use their distribution’s package manager. KDE links to macOS and Windows platform pages and provides nightly installers for macOS Intel and ARM and Windows. Those nightly builds are intended for testing, so users seeking a testing build should distinguish them from the regular platform installation route.

The latest listed release is version 26.08.2, dated 2026-10-08. Lokalize is licensed under GPL-2.0+. KDE links to the Lokalize Handbook and a forum for help, as well as pages for bug reporting, source code, and participation in KDE localization.

Who it's for

Lokalize is best suited to translators contributing to KDE or other free and open-source software, and to people translating OpenDocument files through the .odt-to-.xliff workflow. Its memory, terminology, and QA features make it more relevant to recurring or structured translation work than to someone who only needs occasional text conversion. Choose another kind of service if browser-based collaboration is central to the job: Lokalize is a desktop application.

Pros and cons

• Pro: Free and open-source under GPL-2.0+, so there is no software charge for the desktop localization workflow.
• Pro: Translation memory, terminology management, and QA checks cover three practical needs in software localization.
• Pro: Linux, macOS, and Windows support gives contributors on all three desktop platforms a route to use the same tool.
• Con: OpenDocument translation uses Translate-Toolkit to move between .odt and .xliff, adding a separate tool to that workflow.
• Con: Desktop deployment makes Lokalize a poor fit when browser access or web-based collaboration is required.
• Con: Nightly installers are meant for testing, not a substitute for the regular installation path when stability is the priority.

Alternatives

For a broader comparison, see Computer-Assisted Translation Software.

• BasicCAT is another free, open-source CAT tool for Linux, macOS, and Windows; consider it if you want a comparable free desktop option.
• CafeTran Espresso has a free plan capped at 1,000 translation units and 500 glossary terms, plus a trial and an annual subscription; it may suit someone who wants a freemium option with a defined free allowance.
• locAGI offers a freemium platform across API, Linux, macOS, and web; consider it if web or API access matters alongside desktop use.
• Supervertaler Workbench is a free option for Linux, macOS, and Windows; it is another desktop alternative to compare.
• ApSIC Xbench includes a free, frozen non-Unicode version 2.9 and a paid version 3.0 at €99 a year; it may suit Windows users focused on terminology and QA checks.
• Déjà Vu X3 offers a free edition for standalone and satellite projects prepared with Déjà Vu X3 Workgroup; consider it if that project setup matches your work.
• Matecat is free, with unlimited features, users, and projects, and supports web, API, Linux, and self-hosted use; choose it if browser access or self-hosting is important.
• OpenTM2 is a free, Windows-only translation memory tool under the Eclipse Public License; it may fit a Windows user seeking that narrower focus.

Verdict

Choose Lokalize if you translate KDE or other open-source software, or need to translate OpenDocument files with translation memory, terminology management, and QA checks at no software cost. Its cross-platform desktop availability and GPL license make it a practical fit for that work. Look elsewhere if you need a browser-based collaboration workflow or want to avoid the separate Translate-Toolkit step for .odt translation.