PolyGrid is an Excel ↔ XLIFF localization studio for multilingual teams. Convert messy spreadsheets into CAT-ready XLIFF and merge translations back with formatting preserved. It supports XLIFF 1.2 and 2.1, built-in and custom SRX segmentation, MT prefill via DeepL or Google, and processes files fully in memory with zero storage. Works with all major CAT tools. Start free, upgrade as you scale.