Silent Highlight — Web & PDF Highlighter by Profang

Tired of highlighting extensions that force you to create an account or track your reading habits? Meet Silent Highlight.

Silent Highlight is a next-generation web and PDF highlighter built on a different philosophy: Zero Friction and Absolute Privacy. Simply install it, select text on any webpage or PDF, and start highlighting at the speed of thought. No sign-ups, no cloud, no lag.

✪ WHY SILENT HIGHLIGHT IS DIFFERENT

✔ 100% Private: No servers, no trackers. Your highlights stay on your device, in the browser's extension storage, and only leave it if you choose to export them.
✔ No Sign-ups: No account and no email address required. Works instantly right out of the box.
✔ Ultra-Lightweight: Engineered for speed and designed to stay out of your way.
✔ Premium Design: A modern glassmorphism interface that lives cleanly in the browser sidebar, keeping your reading space clutter-free.

✪ BUILT FOR DATA SOVEREIGNTY AND RESEARCH CONTINUITY

✔ Safety Net: Uninstall from Silent Highlight's own settings panel and it exports a JSON backup before removing itself. An automatic backup also runs before any bulk data import, and you can export a copy at any time.
✔ Data Integrity Protection: Built-in HMAC-SHA256 verification ensures your local database stays healthy and protected against corruption or external tampering.
✔ UX Resilience (Context Guardian): Silent Highlight reconnects automatically after an extension update. Keep working without interruptions or the need to reload your tabs.
✔ Legacy Migration: Updating from TextMark? All your old highlights and folders are migrated and cryptographically signed instantly in the background, for free.

✪ CORE FEATURES

✔ Select and Highlight: A beautiful, contextual floating toolbar appears exactly when you need it, with high-contrast icons for perfect visibility.
✔ Full PDF Support: Highlight text directly on web pages and local PDF documents using the integrated offline viewer.
✔ Color Coding: Organize your research using 5 vibrant highlight colors.
✔ Smart Sidebar: Open your command center (Alt+Shift+H, or Option+Shift+H on macOS) to search, filter, and manage all your highlights globally.
✔ Story Mode: Manually reorder highlights in the sidebar to build research outlines and logical narratives, regardless of the original source page.
✔ Tags and Notes: Add deep context to your highlights with custom tags and full Markdown-compatible notes.
✔ Universal Export: Download your data as JSON for backups, or as Markdown for direct import into Obsidian, Notion, or Readwise.

✪ OUR PRIVACY PROMISE

Silent Highlight is a pure tool for professionals, researchers, and students who demand the highest standards in privacy and technical reliability. No accounts, no cloud, no friction.