PDF Note Taker

PDF Annotator is a free note taker for PDFs that runs in a browser tab. Drop in a paper, a textbook chapter or a contract, and leave sticky notes, highlights and typed comments on the page itself — no account, no install, and no upload to anyone's server.

It's built for the way reading actually goes: you're halfway down page 14, something clicks, and you want the thought recorded next to the sentence that caused it rather than in a separate notes app you'll never reopen.

Add sticky notes and comments to any PDF

Press N or pick the sticky note tool, then click where the note belongs. A small marker drops onto the page and a note panel opens next to it — type, click away, and it collapses back to the marker so the page stays readable. Click the marker again to reopen it.

Three ways to record a thought, depending on what it is:

• Sticky note for a remark about a passage — it sits beside the text instead of on top of it.
• Highlight for marking the passage itself. Drag across the text and pick a colour; the highlight PDF page covers this tool in detail.
• Typed text for longer notes that need room — placed anywhere on the page, in the margin or between paragraphs. See write on PDF for fonts and sizing.

Scanned PDFs — photographed pages, older exam papers — have no selectable text, so the highlighter has nothing to grab. Sticky notes, the pen and the shape tools work on those pages anyway, because they're anchored to coordinates rather than to characters.

Built for study, research and review

Three jobs come up again and again, and they want slightly different habits.

Study. Reading a chapter with a question in mind beats reading it cover-to-cover. Highlight the claim, sticky-note the question it raises, and the second pass before an exam becomes a tour of your own markers instead of a re-read.

Research. Papers are dense and mostly not what you need. Note what's actually usable — the method, the sample size, the one figure worth citing — right where it appears, so you don't have to reconstruct why you saved the paper three weeks later.

Review. Contracts, briefs, a colleague's draft. Notes on the page are unambiguous in a way "page 4, second paragraph, the bit about renewal" never is.

Organise notes by colour

Notes and highlights come in four colours — yellow, green, blue and pink — and one convention applied consistently does more for a document than any tagging system. A common split: yellow for "important", green for "agree / evidence", blue for "look this up", pink for "problem".

Colour is set per note, so you can recolour as you go. The point isn't the palette; it's that a page skimmed a month later still tells you which marks were questions and which were conclusions.

Your notes stay on your device

Opening a PDF here doesn't upload it. The file is read and rendered inside the browser tab, and your notes are stored the same way — locally, on your machine. Nothing about the document, the annotations, or your reading habits reaches a server.

That matters for the documents people actually annotate: a paper under embargo, a client contract, a manuscript that isn't yours to share. With a cloud note taker, marking it up means uploading it first.

The session is also saved locally, so closing the tab isn't the end of the work — reopen the page and the document comes back with its notes, zoom level and page order intact. One document at a time, though: opening a new file replaces the saved session, so export before you switch.

Export the annotated PDF

Download and you get a normal PDF with the notes drawn into the page — the marker plus its text, rendered where you put it. It opens anywhere: a phone, a library computer, a colleague's machine, an e-reader. Nobody needs this tool, or any tool, to read your annotations.

The trade-off is that exported notes are part of the page rather than clickable pop-ups, and long ones are trimmed to roughly the first 200 characters when printed beside the marker. Sticky notes work best as short remarks; when a note runs long, place it as typed text instead and it exports in full.

What it isn't

Worth knowing before you start, so nothing surprises you halfway through a document:

• Not a notes database. There's no library of documents, no backlinks and no search across files. If you want a graph of everything you've ever read, a dedicated research manager is the right tool.
• No sync between devices. Local storage is the privacy guarantee and the limitation at once — notes started on a laptop aren't on your phone. The exported PDF is what travels.
• Files up to 50 MB. Everything is held in the tab's memory, so very large scans are out of scope. That ceiling covers most papers, chapters and contracts comfortably.

For a wider comparison of browser tools, desktop software and cloud services — including where each type genuinely wins — the PDF annotation app page lays them out side by side.

Open a PDF, press N, start noting. That's the whole product, and it's free.