ZetaMarker - PDF & Web Highlighter by ZetaMarker Ltd.

Highlight and annotate web pages and PDFs. Sync your highlights and notes with ZetaMarker.

About this extension

Highlight web pages and PDFs, add notes, and build a searchable research library. Start locally with no account required, then sync across devices when you're ready.

PERFECT FOR

Researchers
Students
Developers
Knowledge workers
Anyone who reads extensively online

🔒 PRIVACY-FIRST — YOU CHOOSE WHERE IT RUNS

Many highlighter extensions ask for broad permission to "read and change all your data on all websites." ZetaMarker doesn't.

ZetaMarker uses a limited-permission approach: it only runs on pages where you turn it on — with a click on the extension icon or a keyboard shortcut. It does not watch every tab you open, and it does not annotate sites you haven't activated.

That means banking, email, healthcare portals, and work apps stay private by default. You invite ZetaMarker in only when you're ready to read and annotate.

No account required to start
Highlights save locally in your browser first
Cloud sync is optional — sign in only when you want it
We don't sell your data

Learn more: Privacy & Control

WHY ZETAMARKER IS DIFFERENT

🔒 Privacy-first — page-by-page activation, not blanket site access
✅ No account required — start highlighting immediately after install
📄 Web pages & PDFs — one consistent workflow for articles and documents
☁ Cloud sync — pick up on another browser or device when you're ready
🔍 Search everything — find any highlight, note, or page in your library
📤 Export your highlights — PDF, Markdown, HTML, or plain text

HOW IT WORKS

Activate ZetaMarker on any web page or online PDF
Select text, pick a color, and add a comment
Review highlights in the sidebar — sort, jump to any highlight, copy notes
Sign in to sync to the cloud, organize in your dashboard, and export

📄 HIGHLIGHT WEB PAGES & PDFs

Five color-coded highlights with comments and page notes
Custom page titles to keep your library organized
Clean sidebar workspace — browse, sort, and navigate highlights without clutter
Copy one highlight or copy all with source URL and date
Light, dark, or system theme

Online PDFs open in the built-in viewer with the same highlighting workflow as web pages. Local PDF files can be uploaded to your dashboard to highlight and sync (Pro).

☁ CLOUD SYNC & WEB DASHBOARD (Pro)

Your research library lives at app.zetamarker.com:

Sync highlights across browsers and devices
Full-text search across titles, URLs, notes, and comments
Hierarchical labels — nest and organize your way (Work → Projects → Research)
Star important pages and filter your library
Upload and annotate PDFs in the dashboard
Trash with restore — recover deleted pages
Bulk actions — label, star, delete, and export multiple pages
Overview analytics — see your reading patterns at a glance

Local highlighting keeps working even when cloud sync is paused.

📤 EXPORT YOUR HIGHLIGHTS

Copy formatted highlights to clipboard from the extension
Export pages to PDF, Markdown, HTML, or TXT from the dashboard (Pro)
Bulk export from your library for reports, study notes, and backups (Pro)

FREE VS PRO

Free — highlight web pages and PDFs locally, forever. No account required.

Pro — cloud sync, the full web dashboard, labels, search, export, and cloud PDF storage. Start with a 7-day free trial — no credit card required.

See current plans: View Plans

GET STARTED

YOUR DATA, YOUR CONTROL

Your highlights and comments belong to you. We do not sell your data.

Installing the extension or creating an account means you agree to ZetaMarker's Terms of Service.

ZetaMarker helps with web highlighting, PDF annotation, research organization, optional cloud sync, and exporting your highlights.

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Required data collection, according to the developer: