Open TLC

What Open TLC is

Open TLC is a free, open-source, browser-based computer-assisted translation tool for professional translators, learners, and teams. It offers translation memory, terminology management, and quality checks across 44 registered format workflows, covering areas such as Office files, localization, publishing, subtitles, and CAT project files. Format-specific adapters check files and preserve inline codes, placeholders, and structural metadata during translation and export. Open TLC supports XLIFF 1.2, 2.0, and 2.1, as well as TMX, TBX, and SRX exchange, and lists compatibility with several CAT formats and return packages. Projects remain in IndexedDB in the current browser profile and device; the application says it does not send project content to its own storage server. OCR and audio or video transcription run locally in the browser, though model files may be downloaded and cached. Projects can move between browsers or devices through Open TLC JSON or XLIFF exports. Browser storage can be lost if site data is cleared, a profile changes, a device fails, or browser maintenance occurs, so regular exports are recommended. Generic ZIP imports require a validated manifest and safe member paths. Translated PDFs are flattened, and complex fonts, transparent artwork, or scanned pages may need visual review.