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Open TLC review

Free#27 of 29 in Computer-Assisted Translation Software

A format-focused, open-source CAT tool for translators handling diverse file workflows.

6.4/10Editor score
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Open TLC is a browser-based, open-source computer-assisted translation tool for professional translators, learners, and teams. Its focus is structured work across office documents, web and localization resources, publishing files, subtitles, media, and CAT exchange formats. The application supports translation memory, terminology management, protected inline content, validation, and export, making it suited to translators who need format-aware processing rather than a general text editor.

Its strongest area is format coverage. Open TLC supports 44 registered workflows and includes format-aware import, translation, validation, and export. Translation teams can exchange TMX memories, use TBX terminology resources, and work with XLIFF 1.2, 2.0, and 2.1 projects. Protected inline codes, placeholders, and structural metadata help preserve content that should not be translated. Format-specific checks run before translated output is generated, while CAT package return workflows cover Trados, WorldServer, memoQ, Transit, TIPP, and COTI. Local OCR and audio/video transcription extend the workflow beyond manually prepared text.

Open TLC’s open-source model and free plan make it suitable for users who want a browser CAT tool without a hosted Open TLC storage server. Projects are stored locally in the browser with IndexedDB, and the published platform is web-based. That local approach fits individual work and controlled file handling, but teams seeking centrally managed projects or verified third-party integrations should evaluate alternatives. Open TLC is a strong fit for format-heavy translation, exchange-package work, and users comfortable with local browser storage; it is less suitable for organizations that require a broader connected platform around the CAT workspace.

Open TLC pros and cons

  • Where it wins
    • Supports 44 office, web, localization, publishing, subtitle, and media workflows
    • Handles TMX, TBX, XLIFF, protected codes, and structural metadata
    • Includes local OCR, transcription, QA checks, and CAT package returns
  • Where it doesn't
    • Projects are stored locally in the browser using IndexedDB
    • The application is available as a web platform
    • No verified integrations are presented beyond exchange workflows

Open TLC fact sheet, pricing and score →

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