Merlin

Merlin is a browser AI assistant extension that allows you to bring up a sidebar conversation on any web page, summarize long texts and video content with one click, support word-by-word explanation and rewriting, and aggregate multiple mainstream large models for switching at any time.

AI Chatbot#ChatGPT#Browser Extension#Chat

Updated: 2026-10-26

What is Merlin?

Merlin is an AI assistant extension that runs in a browser. Its core usage method is "ask as you highlight": call up the sidebar on any webpage to directly ask questions, summarize or rewrite the content of the current page without copying and pasting text to another tab. It also aggregates multiple mainstream large models, allowing users to switch models on demand for different tasks without registering and logging in to multiple accounts separately. For people who spend a lot of time reading, writing and researching information on webpages every day, it moves the act of "asking AI" from a separate tab into the page being browsed, eliminating repetitive actions like copying, pasting and switching back and forth. Whether it's research papers, industry reports or foreign language information, users can directly ask AI questions while reading, keeping understanding and follow-up questions on the same screen. For ordinary users who are not familiar with complex prompts, asking questions directly about the page is the most natural way to get started.

Who is it for?

Ideal for knowledge workers, students, and researchers who read a large amount of web content daily, especially those who want to reduce tab switching and let AI answer questions "based on the context of the current page directly". It is also suitable for operations professionals and workplace staff who need to frequently process foreign language materials, emails, and social media copy. On your first try, start with summarizing a long article or translating a foreign language passage, and you will intuitively feel the efficiency changes it brings.

Key features

In-page conversation

Bring up the sidebar on any page you're browsing to ask questions, and the answers will automatically incorporate the context of the current page, eliminating the need to copy and paste or switch between tabs back and forth.

Page Summary

One-click key point extraction for long articles, news and video pages to quickly grasp core information, ideal for skimming through a large amount of materials.

Word Selection Operation

Select any text to get explanations, rewrites, translations or polish; it's ready to use as you select when reading foreign materials and processing copy.

Multi-Model Aggregation

Aggregates multiple mainstream large models, allowing switching by task type during conversations. It leverages the respective strengths of different models in reasoning, writing, and translation, equivalent to having multiple assistants built into the same sidebar for on-demand use.

Writing Assistance & Free Quota

Draft and polish emails and social media copy; offer a certain number of free uses per day to meet daily lightweight needs.

How to use Merlin

Start with high-frequency scenarios like summarizing long articles and translating fragments, and you can immediately feel the improvement in efficiency.
before installation, check the extension's permission description to clarify what data it can read.
Power users can pin frequently used tasks to shortcuts to reduce repeated input, making the extension truly a portable assistant in the browser.
for complex reasoning questions, it is recommended to switch to more suitable models or scenarios, and do not treat it as a universal tool.
After installation, try summarizing and word selection on several commonly used websites to confirm whether the output meets expectations before deciding whether to subscribe.
The results it provides are suitable as first drafts and starting points, and key content still needs to be verified by yourself.

Things to know

Most free tiers have a daily usage limit; heavy users need a paid subscription, so calculate the cost before long-term high-frequency use.

The browser extension needs to read the content of the current page to answer questions, so it has a wide range of permissions; when browsing sensitive pages such as email boxes, online banking platforms, and work backends, it is recommended to temporarily disable the extension before browsing.

Different models show obvious differences in the quality and style of answers to the same question. When it comes to important conclusions, it is recommended to conduct cross-verification and not to rely solely on the output of a single model.

The Q&A context of the extension may be recorded by the service provider, so be cautious when entering sensitive information.

It relies on the stability of network connections and the extension service; its functions are unavailable when offline or when the service malfunctions. Do not fully rely on it for important work.