A Chrome extension that summarizes and reformats any webpage with AI — with full bilingual support for English and Chinese output.
cwsum is a Manifest V3 extension that opens a clean right-side panel on any webpage. Choose TL;DR for bullet-point takeaways or Reformat for a clean, readable Markdown version of the full page with images, links, and tables preserved. Both modes support English and Chinese output, streaming results word-by-word as the AI generates them. Your API key stays on your machine — no analytics, no intermediary servers.
from the toolbar or Cmd+Shift+S
Key stored in Chrome,
never leaves your box
No build step, vanilla JS,
~15 source files
What it is #
cwsum is a Chrome extension that puts AI summarization one click away on any webpage. Click the toolbar icon (or press Cmd+Shift+S) and the side panel opens with a structured summary of whatever you’re reading. The extension extracts the page’s visible text — stripping out navigation, sidebars, ads, and scripts — and sends it to the AI endpoint you configure.
Your API key lives in chrome.storage.sync
and is never sent anywhere except directly to the API endpoint you specify. The extension has no analytics, no tracking, and no intermediate server. It is a thin client between your browser and your AI provider. Page content goes from your tab to the model; the summary goes from the model to the side panel. Nothing else happens.
Features #
TL;DR gives you bullet-point takeaways in under 200 words.
Reformat restructures the entire page as clean Markdown with images, links, and tables preserved — like a reader-mode that keeps the good parts. Both stream results live as they’re generated.
Cached
badge tells you it came from local storage, with
a relative timestamp (“3m ago”). Click the refresh button
to force a fresh fetch.
⌘
Shift
S on Mac,
Ctrl
Shift
S on Windows and Linux.
deepseek-v4-flash
, the cheapest DeepSeek model at
$0.14/M input tokens. Also works with OpenAI, Anthropic endpoints,
or any compatible API.
Keyboard #
Everything is reachable from the keyboard or a single click.
⌘
Shift
S/
Ctrl
Shift
S Open the side panel
FAQ #
deepseek-v4-flash
as the default — the cheapest
DeepSeek model at $0.14/M input tokens. You can change the model name
and API base URL in the extension Options.gpt-4o-mini
and update the API endpoint URL if your OpenAI base URL differs. The extension uses the standard chat completions format.## Install & use
cwsum is a Chrome Manifest V3 extension. It runs in any Chromium-based browser (Chrome 116+, Edge, Brave, Arc). Load it once and it stays out of your way.