Glarity is a free browser extension that summarizes YouTube videos, Google results, PDFs and any webpage, and translates content side-by-side using GPT-4o, Claude 3.5 and Gemini.
About
Glarity is a free, ad-free browser extension that uses AI models such as GPT-4o, Claude 3.5 Sonnet and Gemini to summarize YouTube videos, Google search results, Twitter posts, PDFs and virtually any webpage. It addresses a common problem: long videos and lengthy articles take time to digest, and content in a foreign language is hard to read. Glarity generates cross-language summaries, offers side-by-side full-page translation, and lets users ask questions about the content they are viewing.
The extension works across Chrome, Edge, Safari, Firefox and Opera, and the site reports more than one million users. Glarity Summary is an open-source project, and the product is operated by Felo Inc. Beyond summarization and translation, it includes an AI reader for PDFs and webpages, an AI writing assistant for articles and emails, and a multi-model AI chat with a 200k-token context window and image generation.
Key Features
Pricing & Fees
- Pricing: The core extension is free and ad-free; a paid Plus Plan exists with monthly and annual billing options, but specific prices are not publicly listed on the pages we reviewed; check the official site for current plans.
- Free tier: The basic summarization and translation features are available at no cost and without ads.
- Platform availability: Installable on Chrome, Edge, Safari, Firefox and Opera.
- Plus Plan limit: The Plus Plan guarantees at least 600 GPT-4 queries per month, after which response speed and quality may be reduced.
- Open source: The Glarity Summary extension code is available on GitHub.
Who It's For
Glarity suits students and researchers who need to digest long papers and lecture videos quickly, professionals who process news articles, emails and reports, and non-native speakers who rely on side-by-side translation while reading. Content marketers and social media managers can use it to monitor Twitter and Google results and to draft replies, while journalists and analysts can question lengthy documents through the PDF chat feature. It is a practical fit for anyone whose work involves heavy reading across languages.
FAQ
Is Glarity free to use?Yes, the extension is free and ad-free for its core summarization and translation features; an optional paid Plus Plan adds higher usage and priority features.
Which browsers does Glarity support?Glarity is available for Chrome, Edge, Safari, Firefox and Opera.
How does Glarity summarize YouTube videos?It generates video summaries in more than a dozen languages, produces timestamped highlights, creates FAQs, and supports subtitle generation and translation.
Do I need a ChatGPT or OpenAI account?The site raises this question in its FAQ, but no answer text was present in the pages reviewed; the official site should be consulted for account requirements.
How does Glarity differ from using ChatGPT directly?Compared with ChatGPT's default model, the paid membership removes the roughly 4,000-token length limit on video and article summaries, supports PDFs of about 300 pages instead of 4, and adds parallel side-by-side translations.
Related Tutorials
View all →
Related Tools
View all →
YouTube Transcript Generator YouTube Transcript Generator extracts, summarizes, and translates transcripts from any YouTube video, letting students, researchers, and creators work with video content as searchable text. 
Lilys AI Lilys AI is an AI summarization and knowledge-management assistant that turns videos, audio, PDFs, websites, and books into concise summaries and insights for learners and professionals. 
SummarizeYou SummarizeYou is a free AI-powered YouTube video summarizer that turns any public video URL into key points, time-stamped breakdowns, transcripts, and mind maps. Linnk.AI Linnk.AI is an AI summarizer and translator for documents and web content, built to speed up reading and multilingual research for students, analysts, and knowledge workers. 
Eightify Eightify is an AI YouTube video summarizer that generates concise summaries, key insights, transcripts, and timestamped navigation for YouTube videos in over 40 languages.