📌 Featured · Title Link Introduced in MN 3.6.4 · 8 years of iteration

Your past notes,
glowing in new documents automatically.

When you read a new book, a new paper, a new case, the notes you took on Robbins two years ago surface on their own — no clicking, no searching, no manually adding links. MN treats each card's title as a keyword and its annotation as the definition; whenever those keywords appear in a document you open, your past knowledge lights up on the new page. This isn't manual hyperlinking. It's knowledge networking itself.

Each card: title = keyword, annotation = definition. One card can hold multiple keywords (separated by semicolons)

When reading a new document, matched keywords highlight automatically and click through to the original card

Works cross-notebook — all your notes from the past 5 years share one unified dictionary

30-second framing

Who should turn it on / who can skip it / what it actually solves

✅

Turn it on if

You've used MN for 6+ months. Your subject is concept-dense and cross-referencing (medicine, law, research, languages). The same concept keeps reappearing across books and chapters — and you most want them to "recognize each other."

⚠️

Skip it if

You just started with MN and your library is still empty — there's nothing to surface yet. Come back once you have 200+ cards. Or: you're using MN for pure fiction, where there's no structured concept to link.

💡

What it solves

"I learned this concept before, but I can't remember which book or chapter." Every long-term learner's core pain. Title Link makes every re-encounter surface its history automatically — you don't have to recall where you saw it.

Interactive Demo

Hit Begin reading — watch your old notes surface

The passage below simulates a page in a new book you just opened. On the right is your "past notes library" (4 cards). Hit "Begin reading" and watch MN reverse-match your old cards onto the new document. Click any highlighted keyword to pop up the original card with source page.

📚 My notes library4 cards

Idle · click Begin reading

💡 The point: you didn't click any "add link" button. These 4 cards were made on some other day, while you were taking notes on something else entirely. Today you opened a completely different book — and they surfaced on their own. If your library has 500 cards, every page you read today gets scanned by all of them — your entire past brought into the current reading.

MarginNote real screenshot: mind map on the left, PDF on the right; a linked card 'Adaptive Immune Response' surfaces in the middle with a back arrow and a link to the previous card 'Phases of Immune Function' — navigable both ways — Real use: while reading the Robbins immunology chapter, Title Link automatically surfaces your previously-made `Adaptive Immune Response` card and shows where it sits in the `Phases of Immune Function` chain — you can step backward / forward.

How it works

How it's done — just three steps

"Automatic backlinks" sounds like magic, but the mechanism is plain. The elegance is in re-reading every card as a dictionary entry.

1 Every card

Title becomes a keyword

The title you give a card while taking notes — say "Myocardial infarction" or "Promissory estoppel" — is automatically registered as a keyword in MN's Title Link dictionary. One card can hold multiple keywords (semicolon-separated): Myocardial infarction;MI;心肌梗死.

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2 Dictionary keeps growing

Unified across notebooks

The "Myocardial infarction" card you made reading Robbins in 2022 and the one you made reading First Aid in 2024 share the same keyword entry. Five years of learning accumulate into one unified reverse index.

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3 Reverse-matching at read time

New documents auto-scan

When you open any new document, MN scans the page text in real time and applies highlighting to any keyword that hits the dictionary. Click a highlight to jump to the original card and see your old annotation and source.

A few details worth knowing

Multiple keywords: one card can carry several keywords, semicolon-separated. So "Myocardial infarction" and all its variants (MI, myocardial infarction, 心梗) can sit on the same card — whichever spelling shows up in the new document still hits.

Title-level linking only: MN links card titles, not every word inside the card. This is a deliberately restrained design — it prevents your notes from turning into a forest of hyperlinks. Some power users in the community have asked for "hierarchical bidirectional links" (linking down to subnodes inside a card) as an extension.

Performance: Title Link runs on a local dictionary match — no cloud, no AI, instant response. It shipped in MN 3.6.4 (2019) and has matured over years of iteration.

MarginNote Title Link in real use: a research paper on spacing effects on the left with multiple keywords auto-highlighted in blue (spacing effect, exposure effects); a hover preview showing the contents of a past card titled Second; on the right, the past mind map containing Aim / Second / Third — those past card titles are matching and lighting up inside this new document — Reading a new paper — your past card titles (Aim / Second / Third) **light up automatically inside the text**. Tap any blue keyword and the past card surfaces with your notes attached. Shipped in MN 3.6.4 (2019), running for six years.

Evidence

A feature the MN community
has been discussing for 6 years

"Automatic backlinks" as a concept isn't unique — Roam Research and Logseq do unlinked references too. But they all run inside their own note systems. MN embeds the same mechanism inside PDF reading — old notes surface as you read new documents. This three-way combination of "PDF reader + note library + backlinks" is something no other tool has shipped to date. Below is a real community discussion of the feature.

🔗 Chinese community · feature upgrade request thread

"Title Link is great, but if it could extend to hierarchical linking (e.g. a subnode of card A linking to a specific paragraph of card B), it would be even more powerful. I've been using this feature for 4 years — it's why I migrated from OneNote in the first place."

Community discussion · MN Chinese forum · a recurring feature-request theme

Let's be direct: in the 1,482 English App Store reviews, no review uses the words "Title Link" to describe this feature — because it's not the kind of capability users explicitly praise. It's the quietly useful kind. Our evidence is: (1) the feature shipped in MN 3.6.4 (around early 2020); (2) the Chinese community is still discussing upgrade directions for it in 2026 (which means power users are actively relying on it); (3) the three-way combination of "automatic backlinks + PDF reading + note library" has not been replicated by any comparable tool. We don't have stronger English testimonials yet. What this page argues is the integration uniqueness: embedding the well-understood unlinked-references mechanism into PDF reading is something nobody else has done.

Why "automatic surfacing" is cognitively different from "manual searching"

Title Link and manual search aren't the same thing — they're doing two different jobs:

1. Manually searching "where did I learn this before?" usually fails. You have to first realize you learned it, then remember the keyword, then type the search. Any of those three steps breaks the chain and the old note stays buried. Automatic surfacing skips the chain: the old note doesn't wait for you to recall it — it comes to you.

2. New information sticks better when it attaches to something old. But while reading you often don't realize which old idea the new material connects to. Automatic backlinks do that work for you — the system tends to know better than you which two-year-old card relates to what you're reading now.

3. It compounds. Each new card you add makes every future reading session a little richer, because of that one card. This is what long-term MN users mean when they say "the longer I use it, the harder it is to leave" — not lock-in, but that each reading session has more of your past work spontaneously participating.

If you want to think of this as "knowledge embodying itself automatically" — your past learning is no longer dead files in an archive cabinet, but something live that shows up on its own when you read new things — then you understand why this is core to MN's philosophy, not just a feature.

Your past notes,glowing in new documents automatically.

Who should turn it on / who can skip it / what it actually solves

Turn it on if

Skip it if

What it solves

Hit Begin reading — watch your old notes surface

How it's done — just three steps

Title becomes a keyword

Unified across notebooks

New documents auto-scan

A few details worth knowing

A feature the MN communityhas been discussing for 6 years

These workflows depend on Title Link

One system, multiple books, one map

5 years, 5,000 cards

Skeleton first, deep read later

All your past learningshouldn't sit in an archive cabinet.

Your past notes,
glowing in new documents automatically.

A feature the MN community
has been discussing for 6 years

All your past learning
shouldn't sit in an archive cabinet.