Context Harvester

Multi-tab LLM context builder — collect, organize, and export content from multiple browser tabs as structured, token-aware prompts.

Context Harvester — Multi-Tab LLM Context Builder Stop copy-pasting from 5+ browser tabs to build AI prompts. Context Harvester lets you collect, organize, and export text from any page — with one click or keyboard shortcut. ━━━ HOW IT WORKS ━━━ 1. Select text on any page → Right-click → "Add to Context" (or press Alt+C) 2. Snippets appear in the side panel with source attribution 3. Drag to reorder, tag, and organize 4. Export as Markdown, structured prompt, or JSON 5. Paste into ChatGPT, Claude, Gemini, or any AI assistant ━━━ KEY FEATURES ━━━ ✦ ONE-CLICK CAPTURE Select text on any webpage, right-click → "Add to Context". Source URL, page title, and timestamp captured automatically. ✦ TOKEN-AWARE Real-time token counter with model selector: • GPT-4 (128k context window) • Claude (200k context window) • Gemini (1M context window) Visual progress bar warns when you're approaching the limit. ✦ SMART AUTO-TAGGING Automatically detects content type: code, docs, error, discussion, reference. No manual tagging needed. ✦ DRAG-TO-REORDER Arrange snippets in the order that makes the best prompt. Priority context first. ✦ STRUCTURED EXPORT • Markdown — with headers and source attribution • Prompt — XML structured format optimized for AI • JSON — for programmatic use and custom tooling One click copies to clipboard. ✦ KEYBOARD SHORTCUT Alt+C instantly captures selected text without touching the mouse. ━━━ PERFECT FOR ━━━ • Developers building prompts from docs, Stack Overflow, GitHub issues • AI/ML engineers gathering research from multiple papers • Technical writers compiling information across sources • Anyone who uses AI assistants daily and needs multi-source context ━━━ PRIVACY ━━━ • All data stored locally in your browser • Zero network calls — nothing sent to any server • No account required • Open source (MIT License): https://github.com/rishapgandhi/context-harvester ━━━ PERMISSIONS EXPLAINED ━━━ • contextMenus — Right-click "Add to Context" menu • storage — Save your snippets locally • activeTab — Read current tab URL/title when capturing • sidePanel — Display the snippet manager panel ━━━ LINKS ━━━ GitHub: https://github.com/rishapgandhi/context-harvester Documentation: https://github.com/rishapgandhi/context-harvester/wiki Report Issues: https://github.com/rishapgandhi/context-harvester/issues