Side Reader

Side Reader is a Chrome extension that adds PDF reading and chat to the ChatGPT, Claude, and DeepSeek websites through a sidebar. Its page says it aims to give these assistants features similar to PDFAI and ChatPDF. The page lists features such as split screen, PDF zoom, copy input, upload history, capture and ask, and custom prompts, along with free and lifetime plan tiers. The page text does not give detailed descriptions of how these features work, so specifics beyond these names are not stated.

Key features

• Read and chat with PDFs in a sidebar on ChatGPT, Claude, and DeepSeek
• Split screen
• PDF zoom
• Copy input
• Upload history
• Capture and ask
• Custom prompt

Best suited for

• Users who want to chat with PDF documents inside ChatGPT, Claude, or DeepSeek

Pricing

Free plan listed at $0 per month; lifetime plan listed at $29. The page also shows a pre-lifetime price label without a stated amount.