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MateCat

Free, open-source, web-based CAT tool with adaptive machine translation

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About

MateCat is a free and open-source online CAT tool from Translated, originally built in an EU-funded research project with Fondazione Bruno Kessler and the University of Edinburgh. It runs entirely in the browser: upload a document, translate segment by segment with adaptive machine translation from ModernMT, and pull suggestions from the MyMemory public translation memory.

It supports 80+ file formats and 200 languages and is used by 100,000+ translators. Being web-only means there is no offline mode, and very large files can be slow.

What it can do

  • Adaptive MT (ModernMT) built in
  • MyMemory public translation memory
  • 80+ file formats, 200 languages
  • Collaboration and job management
  • Free QA checks and LQA scoring

Setup

  1. Go to matecat.com and create a free account.
  2. Upload your source file (DOCX, XLIFF, HTML, and more).
  3. Choose source and target languages and start the project.
  4. Translate segment by segment with MT and TM suggestions.
  5. Run QA checks and export the translated file.

Prerequisites

A web browser and internet connection; your source files.

Use cases

automationothers

Works with

Any agent (.md)

Trust score — 8/10

/10 trustVerified

Scored 8/10 (verified tier, metrics-v1). Evidence: Free forever; 100,000+ language professionals (Translated/SoruceForge, 2026); Open source (LGPL); built by Translated, FBK, University of Edinburgh (EU research project); ModernMT adaptive MT and MyMemory TM integration confirmed across sources; Web-only (no offline mode); large files can be slow - stated limitations. License: LGPL open source; free hosted version.

How the trust score is built

Full methodology →
Adoption · stars/downloads, log-scaled vs peers
8.0/10
Maintenance · recency, releases, issue load
7.0/10
Openness · license + docs
9.0/10
Manual review · sanity read + red-flag check
6.0/10
  • · Free forever; 100,000+ language professionals (Translated/SoruceForge, 2026)
  • · Open source (LGPL); built by Translated, FBK, University of Edinburgh (EU research project)
  • · ModernMT adaptive MT and MyMemory TM integration confirmed across sources
  • · Web-only (no offline mode); large files can be slow - stated limitations

Sources

Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.