TranslateBase is an AI-driven, multi-engine translation platform offering text, PDF, webpage, image, subtitle/video, and OCR-based scanned-PDF translation. The service emphasizes free basic access and a Plus subscription that unlocks higher quotas and advanced features. It supports 100+ languages and provides a side-by-side bilingual view and engine comparisons to help users assess translation quality. Key capabilities include text translation with multi-engine side-by-side outputs, document translation with layout-preserving bilingual results, OCR-based translation for scanned PDFs, and a PDF estimate tool that returns an instant price and a single-export option. It also offers Document Chat / PDF AI Q&A to turn PDFs into a searchable knowledge base, image translation with text recognition and downloadable translated images, and real-time video subtitle translation with audio playback. Learning aids such as AI word extraction, grammar analysis, pronunciation/audio playback, and vocabulary collection are included, along with a browser plugin (and mobile options) to enable richer in-browser translation and hover/one-click webpage translation. Supported engines include ChatGPT, DeepL, Microsoft, Google, DeepSeek AI, Claude, Gemini, GLM AI, and Doubao AI, with availability depending on plan.