Keyword Highlighter - Multi Highlight

Highlight keywords on any website — with keyword groups, per-site rules and instant search for free.

Multi Keyword Highlighter highlights multiple keywords at once, in different colors, on any webpage and now in PDFs too. It finds every keyword you care about the moment a page loads, so the information that matters is impossible to miss. Think of it as Ctrl + F for many words at the same time: always on, color-coded, and organized into groups you control. ✦ New in 1.1: PDF Support - PDFs Open Ready to Highlight — PDFs open automatically in a built-in Highlighter view, with all your keywords highlighted just like on any webpage. - Mark Up Any PDF — Highlight text, draw with a pen, sweep over lines with a marker, erase strokes, and pin sticky notes, in six colors and three sizes. - Keyword Panel — See every keyword found in the PDF with its count, and click to jump between matches. - Download & Print With Your Marks — Save an annotated copy of the PDF, with your notes included as real PDF comments, or print it directly. - Your Marks Are Saved — Annotations are saved automatically and come back whenever you reopen the same PDF. Undo and redo are always available. - PDFs on Your Computer — Open PDFs from your computer with the file picker or by dragging them in, or allow file access in Chrome for automatic opening. - Prefer Chrome's Viewer? — Open any PDF in Chrome's own viewer with one click, or turn off automatic opening in Settings. ✦ Key Features - Automatic Keyword Highlighting — Your keywords are highlighted instantly as each page loads, across every website you visit. No clicking, no re-running a search. - Multi-Color Keyword Sets — Assign red, green, orange, blue, pink, or purple to each set of words and categorize information at a glance. - Keyword Groups — Organize keywords into separate groups and switch any group on or off with a single toggle, without losing your saved words. - Site-Specific Groups — Limit any group to one website. Enter youtube.com and it highlights across the entire site, including every subpage and subdomain, or enter youtube.com/subscriptions to target just that section. Leave it blank and the group works everywhere. - Exclude Any Site — Turn highlighting off on a website with one click using "Exclude current site". Manage your excluded sites anytime in Settings. - Match Count on the Icon — See how many keywords were found on the current page right on the toolbar icon. You can turn it off in Settings. - Updates Every Open Tab — Changes to your keywords apply instantly to all your open tabs, with no page reload needed. - Instant Keyword Search — Search across all your groups at once, jump straight to any keyword, and step through repeated matches with a single click. - Six Designed Themes — Choose from Obsidian, Ember, Matcha, Abyss, Amethyst, and Rosé: six hand-tuned dark palettes built for long reading sessions. - Works on Dynamic Pages — Keeps highlighting as new content loads on infinite-scroll feeds and single-page apps. - Never Interrupts Your Typing — Highlighting stays out of chat boxes, comment fields, and rich-text editors, so your cursor never jumps while you write. - Import & Export — Back up your keyword groups to a file and pick exactly which groups to include. Restore them in another browser, profile, or device. - Large Keyword Lists — Paste long word lists without worry. Your keywords are saved on your device as you type. - Guided Walkthrough — A short built-in tour shows you the essentials the first time you open the extension. - Lightweight & Fast — Highlights are drawn by the browser itself without changing the page, so even thousands of keywords keep pages fast and layouts intact. - Clean Modern UI — A minimal, distraction-free interface designed to stay out of your way. ✦ Who It's For Anyone who reads long pages or documents and needs to spot specific words quickly, without running Ctrl+F over and over. ✦ How It Works 1. Open the extension and create a keyword group 2. Type your keywords separated by a space, comma, or new line 3. Pick a highlight color, and optionally limit the group to a single site 4. Click Highlight, and every match lights up instantly on every page and PDF you open ✦ Privacy Multi Keyword Highlighter is completely free, requires no account, and has no sign-in. Your keywords, notes, and annotations stay on your own device and are never collected, transmitted, or sold. The extension requests only the permissions it needs: website access to highlight pages and open PDFs, and download permission only if you choose to export a backup.