Definer - Word Translator, Ask AI, Dictionary Extension Chrome

Definer - Word Translator, Ask AI, Dictionary Extension

Select text to translate, define, or ask AI. A word translator and dictionary extension for webpages, PDFs, and EPUBs.
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Features & Capabilities

Definer keeps you in the reading flow. Simply select text to trigger an instant popup for definitions or translations. It’s more than a dictionary—AI paraphrasing, AI grammar checking, EPUB and PDF reading, IPA pronunciation, and a Sign Language dictionary are all built in.

You can tailor sources from Wikipedia, DuckDuckGo, and more, and add custom data sources via iframes, turning Definer into a versatile language hub inside your browser.

User Growth & Download Statistics

Contact the developer

Chrome-Stats does not own this Chrome extension. Please use these information below to contact the Chrome extension developer.
Developed by:
https://lumetrium.com
Chrome Web Store
https://chromewebstore.google.com/detail/definer-word-translator-a/noagjioaihamoljcbelhdlldnmlgnkon
Email:
de*****@lumetrium.com
Website:
https://lumetrium.com

Permission Change History

2025-05-05: Version 1.8.6 → 1.8.8
Add Permissions: scripting
2025-01-24: Version 1.4.6 → 1.5.3
Add Optional host permissions: <all_urls>
2024-12-23: Version 1.3.19 → 1.4.0
Add Permissions: identity
2023-04-25: Version 1.2.5 → 1.3.0
Add Host permissions: *://*/*
Add Permissions: declarativeNetRequest offscreen
Remove Permissions: webRequest webRequestBlocking <all_urls>

User Reviews

Users repeatedly praise Definer for its convenience, fast one-click lookups, AI-assisted explanations, and a highly customizable, feature-rich interface. The popup design lets them stay on the current page while exploring meanings, which is highly valued for language learning and reading. Overall sentiment is very positive, highlighting speed, versatility, and seamless access to multiple sources.
Pros
  • Extremely convenient with one-click word lookup that eliminates tab switching.
  • Intuitive, smooth UI and a feature-rich, highly customizable extension.
  • AI-powered explanations and translations, plus the ability to connect to your own AI API.
  • Supports multiple sources and quick internet lookups from inside the popup (no leaving the page).
  • Very helpful for language learners, aiding vocabulary growth and comprehension across English, Japanese and more.
Cons
Recent reviews
best extension after ublock and dark reader.
by Ta*****, 2026-07-11

It's amazing, I have one question, is there a way to view google images directly from the popup and not on a new tab?
by Ka*****, 2026-06-21

Incredible! Free to use and a must have when you study from online sources!
by Go*****, 2026-06-19
View all user reviews ›

Is Definer - Word Translator, Ask AI, Dictionary Extension Safe?

Risk impact
Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Definer - Word Translator, Ask AI, Dictionary Extension requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details
  • Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
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Risk likelihood
Risk likelihood measures the probability that a Chrome extension may turn malicious. This is determined by the publisher and the Chrome extension reputation on Chrome Web Store, the amount of time the Chrome extension has been around, and other signals about the Chrome extension. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Chrome extension.

Definer - Word Translator, Ask AI, Dictionary Extension has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details
  • High This extension was recently updated in the past month. New updates may not be stable or safe.
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