ChatDOC vs PDF.chat

ChatDOC is a web document assistant that lets you converse with uploaded files in natural language. It can summarize, extract, locate, analyze, and rewrite content from PDFs, Word files, Markdown, ePub, TXT, and scanned documents. A folder upload supports questions spanning multiple documents. Responses include page and reference citations, links that highlight source passages, and highlighted numerical values for checking answers. ChatDOC provides an API for embedding document processing and generated responses in other applications. Its PDF Parser API recognizes text, tables, and images and converts PDF material into formats such as JSON. Processing requires an internet connection. The service runs on the web, through a browser extension, and via API. A free plan is available; Pro costs $8.99 a month or $89.90 a year, with larger limits.

PDF.chat lets users upload documents, ask questions, and receive answers cited to exact pages in over 100 languages. It accepts PDFs, Word and PowerPoint files, text files, and images, including scanned or photographed documents that its OCR models read on its own infrastructure. Long documents are indexed so questions can retrieve relevant pages from reports, textbooks, and dockets. Users can compare Claude, GPT, Gemini, Llama, and DeepSeek answers side by side in one chat, then export results as plain text, Markdown, DOCX, searchable PDF, CSV, or JSON. The service runs in a browser without a download or installation. Its REST API ingests documents, returns per-page text and metadata, and supports chat with page citations; API use is metered per page. The Free plan costs nothing, with pages resetting at midnight UTC and no credit card required. Starter costs $5 a month and includes 750 pages per month. PDF.chat says files are automatically deleted shortly after processing and are not sold, shared, or used for training; on paid tiers, relevant passages may be sent to third-party AI providers.