Highlight
Mark what matters
Highlight, underline, or annotate any text on any page. Use highlights for key passages, comments for interpretation, and tags for retrieval.
iOS & Android
Read with
intention.
Marker is a browser for readers who mark up the web. Select text on any page, highlight it, underline it, or attach a note. Your annotations stay on your device.
Marker turns each page into a
working document.
Highlights persist across sessions.
The Feynman Technique
Choose a concept. Explain it as if teaching a child. Identify gaps in your explanation. Return to the source material.
Review and simplify.
N
Feynman
Nobel physicist and legendary teacher
Physics Today, 1988
W3C
Annotation spec.
Anchors survive page updates.
Everything for markup.
Nothing for tracking.
Built on the W3C Web Annotation data model. Works offline and keeps your reading data local.
Notes
Write in Markdown
Attach rich notes with Markdown support. Your writing stays beside the source text and reappears when you return.
Resilient anchoring
Annotations survive page updates
Marker saves the quote, position, and element path so marks can re-attach when a page changes.
Library
Bookmarks and history
Bookmarks, browsing history, and every annotation live in one local library on your device.
Marker sync is being shaped around Semble/Cosmik bookmarks and Margin notes, so saved pages and annotations can move through ATProto without turning browsing history into a feed.
Your annotations.
Your device.
No accounts. No sync subscriptions. Annotations live in a local SQLite database. Export them when you want a copy.
Exact match finds your text by quote and context
Position fallback uses character offsets when text shifts
Structural fallback keeps an element path as a last resort
Attention
Attention is the behavioral and cognitive process of selectively concentrating on a discrete aspect of information.
William James wrote: "Everyone knows what attention is. It is the taking possession by the mind, in clear and vivid form."