Langzapp is a professional desktop language translation tool for Windows. Translate DOCX, PDF, PPTX, Excel, subtitles and plain text — privately, instantly, with AI-quality output. No cloud. No data leaving your machine.
Built for translators, localization teams, and businesses who need high-quality translation without sending sensitive documents to the cloud.
Translate DOCX, PDF, PPTX, Excel and plain text while preserving original formatting, fonts, and layout.
Explore formats →Your documents never leave your computer. No API calls, no cloud processing, no third-party servers. Total data privacy.
Learn more →Backed by OPUS-MT, CTranslate2, and specialised models for Asian languages. INT8-quantised for speed on regular hardware.
About the models →Translate SRT and VTT subtitle files with all timing codes preserved. Perfect for video localization workflows.
Queue multiple documents and translate them in sequence. Real-time progress indicators keep you informed.
Start with a 30-day free trial. New model versions and language improvements included throughout your subscription year.
See pricing →Speed up your workflow with AI-assisted first drafts for DOCX and PDF documents — then refine in your CAT tool.
Keep sensitive client materials on-premises. No need to upload confidential contracts or reports to external APIs.
Instantly translate reports, presentations, and spreadsheets from partners and subsidiaries in other countries.
Translate academic papers and journals without worrying about data sovereignty or confidentiality.
$19/year. Cancel anytime. Runs fully offline on Windows 10 / 11 after setup.