Modular tools
Install only what you need and keep the extension light, tailored to your workflow.
Read any web page better
In-page text find, AI summary, selection translation, word lookup, and clean article export. Install only what you need—privacy-first reading tools for the web.
KnowIt is an open-source, modular, privacy-first browser extension for reading the web. Page content stays on your device by default and is not uploaded to KnowIt; model calls use your own API key. It installs on Chrome and Edge. Frequently asked questions
Why KnowIt
Fewer extensions. The capabilities you actually use stay local.
Privacy-first
Page content, selections, in-page find history, and generation results stay local by default—nothing is uploaded to KnowIt servers.
Bring your own API key
One model settings hub for DeepSeek, OpenAI, Gemini, Moonshot (Kimi), Alibaba DashScope, SiliconFlow, and more.
Polished UX
Shortcuts, context menus, a selection toolbar, a side panel, and light/dark themes.
See the tools in action
Interface mockups that follow the site theme and language—the real UI lives in the extension.
Tools
After installing the extension, enable these tools from the workbench.
Free
Text Search
Productivity
Search webpage text like a code editor, with case matching, result navigation, and custom highlights.
Free
Media Downloader
Productivity
Scan and extract images and videos from the current page, with preview and batch download.
Free
Ad Cleaner
Productivity
Hide ads and promotional overlays on the current page. Auto-cleans on load, or right-click to clean, with undo.
Free
Element Inspector
Development
Click a page element to view a Figma-like properties panel, and pick any on-screen pixel with the eyedropper.
Paid
Page Export
Productivity
Clean up page body content and export an editable Markdown copy.
Paid
Content Summary
AI tools
Summarize a full page or selection with AI and extract key points quickly.
Paid
Selection Translate
AI tools
Translate selected text instantly, or run AI full-page translation under the originals.
Paid
Selection Word Inspector
AI tools
Show Pinyin and detailed definitions for selected text to aid reading and learning.
Paid
Smart Writing & Polishing
AI tools
AI assistant for webpage inputs—polish, grammar fix, continue, expand, shorten, or custom prompts.
Free vs Lifetime
Start with free tools, then unlock every premium tool with a one-time purchase.
Free
¥ 0
Text Search, Media Downloader, Ad Cleaner, and Element Inspector.
Lifetime
¥ 6.66
One-time purchase that unlocks all premium tools. Future premium tools stay included—no subscription.
- Page Export, Content Summary, Selection Translate, Word Inspector, Smart Writing & Polishing
- Plus future premium tools
- After payment, activate in the extension with your email and Afdian order number
Activation happens inside the extension: enter your email and Afdian order number. Each order + bound email can be activated up to 2 times. AI features require your own model API key—KnowIt does not collect or proxy your keys.