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Glasp Web Highlighter

Webpage, PDF, and YouTube highlighting and AI summary tool

free
Last Updated 9/6/2026

About Glasp Web Highlighter

Glasp Web Highlighter is a free Firefox extension that lets you quickly highlight webpages and PDFs in multiple colors and automatically organize the content on the Glasp home page. Highlights support tagging, search, linking, and sharing, and can also sync across devices. The extension also provides summaries of YouTube, web articles, and PDFs using models such as ChatGPT, Claude, Mistral AI, and Gemini.

Best for

Web content researchers
PDF readers
YouTube learners
Users who need to organize highlights

Best use cases

Read webpages and save key points

Annotate and organize PDF content

Get YouTube video summaries

View and share highlights across devices

Features

Webpage and PDF highlighting

Quickly highlight webpages and PDF files in multiple colors.

AI content summaries

Supports summaries of YouTube, web articles, and PDFs using multiple AI models.

Highlight management

Highlights can be tagged, searched, linked, and shared.

Cross-device sync

Show collected content on all devices with one click.

Pros

  • Supports color highlighting on webpages and PDFs
  • Highlights can be tagged, searched, linked, and shared
  • Supports AI summaries for YouTube, web articles, and PDFs
  • Content can sync across devices

Cons

  • Requires access to browser tabs and all website data
  • The developer states that website activity and website content are collected

Pricing Plans

Free

$0Lifetime
  • Color highlighting for webpages and PDFs
  • YouTube, web article, and PDF summaries
  • Highlight tagging, search, linking, and sharing
  • Cross-device sync

* Pricing information is for reference only. Please refer to the latest announcement on Glasp Web Highlighter's official website.

FAQ

It supports websites, PDF files, and YouTube videos; websites, PDFs, and YouTube each offer corresponding highlighting or summary features.
The summary feature uses AI models such as ChatGPT, Claude, Mistral AI, and Gemini.

Tool Information

DeveloperGlasp Web Highlighter
Release Date9/6/2026
Pricingfree