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Sider

AI sidebar and agent for the browser that chats with PDFs and connects to ChatGPT, Claude, Gemini, Grok, and DeepSeek.

  • Freemium
  • Web, Chrome extension, Microsoft Edge, iOS, Android, Windows, macOS
Try Sider free
  • Free plan available
  • No credit card
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What is Sider?

Sider is an AI assistant available as a browser sidebar extension, mobile app, and desktop app that lets users chat with leading AI models including ChatGPT, Claude, Gemini, Grok, and DeepSeek. Its ChatPDF feature lets you upload PDFs, documents, and presentations (up to 2,000 pages per file) to read, analyze, summarize, and translate them across 50+ languages. It also summarizes web pages and YouTube videos, takes notes, generates reports, and assists with writing and research. A free plan with limited credits is available, with paid Pro, Advanced, and Unlimited tiers for higher usage.

Key features

Chat with PDFs, documents, and presentations (up to 2,000 pages per file)

Read, analyze, summarize, and translate PDFs across 50+ languages

Access to multiple AI models in one place (ChatGPT, Claude, Gemini, Grok, DeepSeek)

Summarize web pages and YouTube videos while browsing

Browser sidebar extension plus mobile and desktop apps

Writing assistance, note-taking, and report generation

Pros & cons

Advantages

  • Handles very large PDFs (up to 2,000 pages), beyond many competing tools
  • Multiple leading LLMs bundled into one subscription
  • Available across browser, mobile, and desktop
  • Free tier available to try before subscribing

Limitations

  • Free plan is credit-limited; heavier PDF use requires a paid plan
  • Broad multi-purpose assistant rather than a dedicated, specialized PDF tool
  • Core experience is centered on the browser extension rather than a standalone PDF app
  • Advanced models and higher usage are gated behind pricier tiers

Use cases

Chatting with and summarizing long PDFs, contracts, and research papers

Extracting key points and answering specific questions from documents

Translating PDF content between languages

Summarizing web pages and videos during research

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Try Sider free
  • Free plan available
  • No credit card