I Built a Free PDF Annotation Tool (Because Adobe Charges $200/Year)

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I Built a Free PDF Annotation Tool (Because Adobe Charges $200/Year)

I needed to highlight a few paragraphs in a PDF for my grad seminar. You know the drill — open Adobe Acrobat, click annotate, and then hit the paywall. $200 a year just to highlight text and add comments.

That's when I realized: my sensitive research papers were being processed through a cloud service I don't trust, just to add a yellow highlight.

That shouldn't be the default.

So I built something better.

PDF Annotation & Highlight Tool is a free, client-side app that runs entirely in your browser. No uploads. No accounts. No subscriptions.

What it does:

Upload any PDF (drag & drop or click to browse)
Draw freehand annotations with the pen tool
Add text annotations by clicking anywhere
Highlight text regions with colored overlays (yellow, green, blue, pink)
Undo any annotation with one click
Navigate between pages
Download the annotated PDF instantly

Everything happens locally using pdf-lib and pdf.js. Your files never leave your device. The whole thing is a single HTML file with no server component.

Why this matters

Most PDF annotation tools follow the same playbook: free for basic features, then pay up. Adobe's $200/year subscription is the industry standard, but for simple tasks like highlighting and commenting, it's overkill.

And then there's the privacy problem. Every time you upload a PDF to an online tool, you're sending your documents to a third-party server. For students working with research papers, professionals handling contracts, or anyone dealing with sensitive documents — that's a real concern.

This tool solves all three issues at once: it's free, private, and works offline after the first load.