Highlight the web.
Keep what matters.
The cross-device highlighter for researchers, students, and curious professionals. Mark up any page or PDF, sync everywhere, and rediscover the right insight at the right moment.
✓Activate only on pages you want to highlight — nowhere else.
Rated 4.3 out of 5 stars, 60,000+ installs
Private reading, by design
ZetaMarker only runs on pages where you turn it on — so the rest of your browsing stays private.
You choose each page
Turn ZetaMarker on when you're ready to read and annotate — with one click or a keyboard shortcut. Skip it everywhere else.
Sensitive sites stay private
Banking, email, healthcare, and work apps stay untouched unless you explicitly activate ZetaMarker there.
Nothing runs in the background
ZetaMarker does not watch every tab you open. It waits for you on the pages you invite.
One account per browser profile
Cloud sync links each browser profile to one ZetaMarker account — so local highlights cannot be uploaded to the wrong account by mistake.
Designed for trust
ZetaMarker
Runs only where you turn it on
Other highlighters
Many start on every site automatically
How it works
The workflow is simple: browse → highlight → organize → search → export.
1. Select
Select text while reading any web page or PDF in your browser.
2. Highlight & annotate
Choose a color, add a note, and keep the exact context of what you saved.
3. Organize & find later
Label, search, export — and pick up from any device in your dashboard.
Built for research, reading, and knowledge work
A fast highlighter that turns everyday browsing into an organized, searchable library — without blanket access to every site you visit.
You choose where it runs
ZetaMarker only runs on pages where you turn it on — so everyday browsing on email, banking, and health sites stays private.
Highlight any web page or PDF
Mark up articles, docs, research papers, and PDFs right where you read them.
Rich notes and annotations
Go beyond color. Attach context and comments so insights stay actionable later.
Sync across devices
Pick up where you left off across browser, desktop, and mobile with reliable cloud sync.
Everything in your dashboard
Review, organize, and continue highlighting from a centralized web workspace.
Hierarchical labels
Organize research your way with nested labels (Work → Projects → Research).
Find anything instantly
Full-text search across pages, PDFs, notes, and labels — built for big libraries.
Export when you're ready
Export highlights and notes to PDF, Markdown, HTML, or TXT for sharing, studying, or backup.
Simple pricing
Start free on any page or PDF. Upgrade to Pro for cloud sync, exports, and your web dashboard.
Start with a 7-day Pro trial — no credit card or payment details required.
Free
$0
Local-first highlighting — no account required
- Unlimited offline highlights
- Highlight web pages and PDFs in the browser
- Local-first experience with no account required
Pro
$2.71
USD / month
$39.00 / year $32.50 / year (billed annually)
After your trial, choose monthly or yearly billing in the dashboard.
No credit card or payment details required for the trial.
- Cloud sync across devices
- Full access to the web dashboard
- Upload and annotate PDFs in the dashboard
- Hierarchical labels and advanced search
- Export to PDF, Markdown, HTML, and TXT
- 300 MB total cloud PDF storage (up to 50 MB per file)
Frequently asked questions
Quick answers to the most common questions.