Chat Lightning

Speed up long ChatGPT conversations and add power-user features. Local-only, zero data collection.

Chat Lightning is a free, local-only Chrome extension that makes long ChatGPT conversations load instantly, then adds the power-user tools ChatGPT does not ship. With instant loading speeds, advanced input enhancements, and total privacy, no account, no backend, no telemetry. PERFORMANCE - Trim long conversations: renders only the last N messages so a 500-message chat opens instantly instead of freezing. Full history stays safe in ChatGPT; nothing is deleted. - Turbo mode: strips code highlighting, math, and copy buttons for max speed. - Load older messages button. - Performance warning when messages pile up past the limit. - Live stats in the popup: rendered vs. total and percent saved. PROMPT ASSISTANCE - 7 rewrite modes: Fast, Smart, Deep, Turbo, Balanced, Quality, Ultra. - 4 quick presets: Friendly, Professional, Casual, Humorous. - Rewrite lands in the composer for review, never auto-sent; original kept in prompt history. INPUT ENHANCEMENTS - Document upload: attach a text, code, or PDF file and its contents are pulled into your prompt, read locally on your device; nothing uploaded. - URL content fetcher: paste a link, get the page text in the composer. - Prompt history with up/down arrow recall. - Character counter vs. the 16,500 limit. - Expand / collapse the prompt textarea. PER-MESSAGE TOOLS - Copy as text and copy as HTML. - Char / word counter under each message. - One-click visual hide (refresh restores). NAVIGATION & APPEARANCE - Scroll-to-latest button. - Shift+click sidebar chat to delete instantly; guarded "delete all" in popup. - Adjustable message width and presentation blur mode. PRIVACY FIRST - Zero data collection. Zero telemetry. No account, no backend. - No remote code. - The only outbound request is the user-initiated URL fetch. Works on Google Chrome, Microsoft Edge, Brave, Opera, and Vivaldi. Supports ChatGPT at chatgpt.com and chat.openai.com. Independent tool, not affiliated with or endorsed by OpenAI.