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The Liblouis software suite provides an open-source braille translator, back-translator and formatter for a large number of languages and braille codes. It is a set of libraries designed for use in any of a number of applications, both free and commercial. It is written in C so that it does not require a runtime environment and hence can be used in applications written in high-level languages such as Java and Python.


10 Mar 2021 Liblouisutdml Release 2.10.0

Liblouisutdml 2.10.0 has been released. This minor release improves the documentation and improves the build and test infrastructure. It also adds support for liblouis 3.17.

08 Mar 2021 Liblouis Release 3.17.0

This release stands in the tradition of small incremental improvements that make it another fine and solid release. Andrey Yakuboy put in a lot of work to improve Russian literary and computer braille. He also provided a new table for Belarusian uncontracted and computer braille. Aside from that there are numerous improvements in Braille tables such as French, Polish and Urdu. The documentation has been improved as has the table meta marking the tables whether they are geared towards forward or backwards translation. I’d like to thank everybody for helping to bring liblouis forward.

01 Dec 2020 Liblouis Release 3.16.1

In the frenzy to ship the 3.16.0 release a little mishap slipped in. The test suite contains an error and consequently doesn’t pass. It was promptly discovered and fixed by Samuel Thibault. So we present to you the real, hopefully fixed 3.16 release. Let’s name it 3.16.1.

Braille translator and back-translator

Liblouis is an open-source braille translator and back-translator named in honor of Louis Braille. It features support for computer and literary braille, supports contracted and uncontracted translation for many languages and has support for hyphenation. New languages can easily be added through tables that support a rule- or dictionary based approach. Tools for testing and debugging tables are also included. Liblouis also supports math braille (Nemeth and Marburg).

Liblouis has features to support screen-reading programs. This has led to its use in numerous open-source and proprietary screenreaders such as NVDA, Orca, BrailleBack and JAWS. It is also used in some commercial assistive technology applications for example by ViewPlus.

Liblouis is the translator of choice for Benetech’s Bookshare, providing braille access to more than 350,000 books to members worldwide. Bookshare currently offers titles in braille in more than a dozen languages, with the ability to quickly add new languages as translation tables become available.

Liblouis is based on the translation routines in the BRLTTY screenreader for Linux. It has, however, gone far beyond these routines. In Linux and Mac OSX it is a shared library, and in Windows it is a DLL.

Liblouis is free software licensed under the GNU Lesser GPL.

Language bindings

The software has interfaces to a number of programming languages. There are known bindings to C, Python, Java and Javascript.

Braille formatter

Liblouisutdml is an open-source braille formatter. The formatting can be configured via a style sheet. By incorporating Liblouis it provides the capability of translating any XML or plain text file into properly transcribed, embosser-ready braille. This includes translation into grade two, mathematical codes, etc.

Liblouisutdml is free software licensed under the GNU Lesser GPL.

Braille production

There are several braille production systems based on Liblouis and/or Liblouisutdml.

BrailleBlaster, a joint project between ViewPlus Technologies, American Printing House for the Blind and Abilitiessoft, is aimed at hands-on production where every detail of the Braille is controlled via a graphical user interface.

DAISY Pipeline, backed by the DAISY Consortium, is aimed at automated, hands-off, high-volume production on the server.

Sao Mai Braille, a rich text editing and Braille translation software for Windows, is developed by Sao Mai Center for the Blind, a non-profit organization based in Vietnam.