The AI workspace for your highlights and annotations

Highlights are the most valuable and most wasted content you produce. Every passage you mark, every marginal note you write, every comment you pin to a document represents a moment of engaged thinking: this matters, this connects to something, this is the part I need to remember. And then the highlight stays locked in whatever app you were reading in when you made it. Kindle highlights stay in Kindle. PDF annotations stay in your PDF viewer. Web highlights stay in a browser extension you might not use next year. The thinking you did while reading, the layer of judgment you added on top of the source, is fragmented across every tool you've ever read in. Finding a specific highlight means remembering which book, which PDF, which article, and which app. Searching across all your highlights at once is impossible in every tool except the one designed for it.

Fabric makes every highlight and annotation searchable by meaning across every source and format. The passage you highlighted in a book, the comment you wrote on a PDF, and the annotation you left on a web page are all findable in one search. Your reading thinking becomes a searchable layer of knowledge, not a scattered collection of locked-in marks.

Every highlight searchable by meaning, across everything

Kindle highlights. PDF annotations. Web page highlights. Document comments. Article markups. Each lives in a different app with its own search, if it has search at all. Fabric brings them together.

AI search reads every highlight and annotation across every source in your library and searches by meaning. Ask "the passage I highlighted about cognitive load in learning" or "my annotation about the methodology flaw" and find it regardless of which book, PDF, or article it was in, and regardless of which app you originally made the highlight in.

The search works across highlights and every other content type in your workspace: notes, documents, transcripts, and full source texts. A highlighted passage is findable alongside your own notes about it and the other sources that address the same concept.

Annotate anything, anywhere

Fabric's annotations let you highlight and comment on any content type: PDFs, documents, images, slide decks, and saved articles. Pin a comment to a specific passage, a specific spot on an image, or a specific slide. The annotation is spatial, contextual, and searchable.

Annotate the web extends this to any web page. Highlight passages and leave comments directly in your browser. The annotations persist across sessions and devices, so the thinking you do while browsing is captured permanently and searchable in your library.

Read saved articles and ebooks in the reader and highlight as you go. The highlights join your library immediately, searchable alongside annotations from every other source.

The annotation layer works the same regardless of the source format. A highlight on a PDF, a comment on a web page, and a note on a slide deck are all first-class searchable objects in the same system.

Import your existing highlights

Years of reading have left highlights scattered across tools. Kindle has your book highlights. A PDF app has your article annotations. A read-it-later tool has your web highlights. Starting from scratch would mean losing all of that accumulated thinking.

Fabric's Readwise integration brings in your existing highlights from Kindle, web articles, podcasts, and other sources. The highlights join your Fabric library, searchable by meaning alongside new annotations. The reading you've already done becomes a retrievable asset rather than a collection of locked-in marks.

The import is the bridge. Your highlight history from every tool converges into one searchable system, and from that point forward, new annotations stay in the same place.

Synthesise across your highlighted thinking

Individual highlights are useful. The pattern across highlights is transformative. The AI assistant reads across every highlight and annotation in your library and can synthesise from them.

Ask it to pull together every passage you've highlighted about a topic across books, papers, and articles. Ask it to find where your highlighted sources agree and where they contradict. Ask it to connect a highlight from a book you read last year to an article you annotated this week. The assistant treats your highlights as a curated knowledge base, which is exactly what they are: the subset of everything you've read that you judged worth marking.

This is especially powerful for literature reviews, where the synthesis happens across highlighted passages from dozens of papers, and for building a second brain, where your highlights form the evidence layer underneath your own thinking.

Highlights connected to their sources and your notes

A highlight without its source context is a fragment. In Fabric, every highlight stays connected to the full source: the book, the PDF, the article, the document. Click from a highlight to the full text. See the passage in context. The trail from your thinking to the original material stays intact.

Highlights also connect to your own notes. Write about a highlighted passage in notes and docs and the note, the highlight, and the source are all searchable together. Develop a highlighted idea into an evergreen note. Use highlighted passages as evidence in something you're writing. The highlight is a starting point, not a dead end.

The explorer and similar search surface connections between highlights across different sources. A passage you highlighted in a book and an annotation you made on a paper are linked when they address the same concept, even if you didn't connect them manually.

Organised by content, not by reading app

Your reading apps organise highlights by source: all the Kindle highlights together, all the PDF annotations together. Fabric organises by meaning. Smart organization tags highlights by content and topic, so annotations about methodology cluster together regardless of whether they came from a book, a paper, or a web article.

Browse your highlights spatially with the explorer. See topic clusters. Discover connections between annotations made months apart in different sources. The organisation reflects what your highlights are about, not which tool you happened to be reading in.

Who uses Fabric for highlights

Highlights are central to deep reading and learning. Students highlight textbooks, readings, and slides for studying and dissertations. Researchers annotate papers for literature reviews and research projects. Writers highlight sources as research for their own work. Educators annotate readings with teaching notes. Lawyers mark up contracts and briefs. Consultants annotate client documents and reports.

For structured approaches to working with highlights, see the guides to book notes, the commonplace book, evergreen notes, the Cornell method, and building a second brain.

Get started

Make every highlight and annotation searchable in one place, and stop losing the thinking you do while reading. Try Fabric free.

Comparing tools? See how Fabric compares to Readwise and why readers choose Fabric as the best read-it-later app.

FAQs

Can I search across all my highlights by meaning?

Yes. AI search reads every highlight and annotation across every source and format in your library. Describe the concept and find the highlighted passage, regardless of which book, PDF, or article it's from.

Can I highlight PDFs, articles, and web pages?

Yes. Annotations work on PDFs, documents, images, and saved articles. Annotate the web works on any web page in your browser. Both produce searchable highlights.

Can I import my Kindle highlights?

Yes. Fabric's Readwise integration brings in highlights from Kindle and other reading tools. Your existing highlight history joins the same searchable library as new annotations.

Can the AI synthesise across my highlights?

Yes. The AI assistant can pull together highlighted passages on a topic across books, papers, and articles. It can identify where sources agree, where they contradict, and what themes emerge across your marked passages.

Do highlights stay connected to their sources?

Yes. Every highlight links to the full source text. Click from a highlight to see it in context. The connection between your annotation and the original material stays intact.

Can I develop a highlight into my own note?

Yes. Write about highlighted passages in notes and docs. The highlight, the source, and your note are all searchable together. This is the evergreen notes workflow: turning marked passages into developed thinking.

Can I find connections between highlights from different sources?

Yes. The explorer and similar search surface relationships between annotations across different sources. A book highlight and a paper annotation about the same concept are linked automatically.

Are highlights from different formats searchable together?

Yes. Highlights from PDFs, books, web pages, documents, and images are all searchable in the same query. The format doesn't matter. The meaning does.

Can I annotate images and slides?

Yes. Annotations work on any content type, including images and slide decks. Pin comments to specific spots.

Can I highlight while reading in Fabric?

Yes. The reader supports highlighting and annotating as you read. Highlights are searchable immediately.

Are my highlights automatically organised?

Yes. Smart organization tags highlights by content and topic. Annotations about the same subject cluster together regardless of which source they came from.

How is this different from highlighting in Kindle or a PDF reader?

Kindle and PDF readers lock highlights inside the app and the specific source. Fabric makes highlights searchable by meaning across every source and format, with an AI that synthesises across them. The difference is between highlights you can find in one book and highlights you can query across your entire reading history.

Are my highlights private?

Yes. Your content is encrypted and only visible to you unless you choose to share it. Fabric uses AES-256 encryption and is CASA Tier 2 compliant.