Silent Highlight — Web & PDF Highlighter

Private web and PDF highlighter. No account, no cloud. Colors, tags, Markdown notes, export to Markdown or sync to Obsidian.

Tired of highlighting extensions that force you to create an account, track your reading habits, or hold your notes hostage in someone else's cloud? Meet Silent Highlight. Install it, select text on any web page or PDF, and start highlighting. There is no sign-up screen, no onboarding and no server: your highlights are written to your browser's local storage and stay there. ✪ WHY SILENT HIGHLIGHT IS DIFFERENT ✔ 100% Private: Your highlights stay on your device and only leave it if you choose to export them. No account, no cloud, no telemetry, no trackers. ✔ No Sign-Up, No Card: No account and no email address required, and no trial to start. It works the moment you install it. ✔ Undetectable by the Sites You Visit: The extension exposes no resources to the pages it runs on, so a website cannot fingerprint you by checking whether you have it installed. ✔ Ultra-Lightweight: Engineered for speed and designed to stay out of your way. ✪ CORE FEATURES ✔ Select and Highlight: A contextual floating toolbar appears exactly where your selection ends, with five colors for coding your research. ✔ Full PDF Support: Highlight text in local PDF documents through the built-in offline viewer, the same way you do on a web page. ✔ Smart Side Panel: Your command center (Alt+Shift+H, Option+Shift+H on macOS) to search, filter and manage every highlight across every site. ✔ Notes: Annotate any highlight from the page itself or from the side panel, and find them again by searching the note text. ✔ Flexible Organization: Group by color, category, page or date, and file your ideas into categories of your own. ✔ Story Mode: Reorder highlights by hand to build outlines, summaries and research threads independent of the pages they came from. ✔ Obsidian Sync: Write your highlights straight into a local vault folder as Markdown. Sync is one-way: when a note was edited in Obsidian, it stops and asks — save a dated copy, leave it alone, or overwrite. Nothing is replaced without you choosing it. ✔ Universal Export: Take everything with you as Markdown or as a JSON backup. Your data is never locked in. ✪ BUILT TO SURVIVE THE REAL WEB ✔ Restoration Report: When a page changes and a highlight can no longer be painted, Silent Highlight tells you why instead of silently dropping it, and lets you re-anchor it to the text by hand. ✔ Smart Recovery: Resilient anchors and fuzzy matching bring your highlights back even when the page structure has shifted underneath them. ✔ Data Integrity Protection: Built-in HMAC-SHA256 signatures verify your local database on every read and detect corruption or external tampering. ✔ Context Guardian: The extension reconnects to your open tabs after an update, so in most cases you keep working without reloading. When a tab cannot be reconnected, the panel offers a one-click refresh. ✔ Legacy Migration: Coming from TextMark? Your highlights and folders are migrated and cryptographically signed in the background, automatically. ✪ AVAILABLE IN THREE LANGUAGES ✔ English, Spanish and French, including the on-page toolbar and the side panel. ✪ HOW TO USE IT ✔ 1. Open any web page, or drop a local PDF into the built-in viewer. ✔ 2. Select the text you care about. The color toolbar appears next to your selection. ✔ 3. Pick a color. The highlight is saved instantly, with no dialog and no waiting. ✔ 4. Press Alt+Shift+H (Option+Shift+H on macOS) to open the side panel and search, organize, annotate or export everything you have saved. ✪ 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 — and nothing about your reading ever reaches us, because there is no "us" to reach.