Mark up, review, and study any PDF with colored highlights — free, private, and processed entirely in your browser. No uploads, no account required.
100%
In-browser processing
0
Files ever uploaded
<2s
Time to open a PDF
Free
Always, no paywall
Three steps, no account, no upload — done in under a minute.
Drop a PDF or click to browse. Works on phone, tablet, and desktop — no app to install.
Click any text span and pick a highlight color. Mark as many passages as you need, all without uploading anything.
Save the highlighted file instantly. No watermarks, no email, no waiting.
A free, private way to mark up and annotate PDFs — no software to download, no account to create.
Click a text span to mark it — choose from preset colors so key passages stand out instantly.
Highlight and review PDFs on Windows, Mac, Linux, iPhone, and Android. Any modern browser works — no software to install.
Your marked-up PDF comes out clean — no logos, no stamps, no added pages. Just your highlights.
Everything runs locally in your browser and nothing is uploaded. Your documents never leave your device.
No upload round-trip means you can start marking up the instant you drop your file, even on long documents.
Highlight as many PDFs as you want, as often as you want. No signup, no trial countdown, no hidden paywall.
Highlights land exactly on the text you click — no dragging boxes, no misaligned marks. Existing content stays untouched.
Everything runs client-side in your browser. Nothing is sent to a server, nothing is stored. Your documents stay 100% private.
Marking up a PDF in the browser beats printing it out with a highlighter pen.
Mark key definitions and quotes in lecture notes or textbooks so review sessions go faster.
Flag the clauses that need a second look before signing off on a contract or terms document.
Highlight findings, methods, and citations while reading a paper so they're easy to find later.
Call out action items and decisions in a shared PDF agenda before a team meeting.
Mark the sections that changed in a document so a colleague can focus their review.
Draw attention to the figures that matter most before circulating a financial or status report.
Everything runs in your browser — private, free, and no signup, just like the highlight tool.
Thousands of people highlight PDFs here every day. Here's what a few of them say.
“I mark up every contract before it goes to legal. Highlighting the risky clauses right in the browser saves so much back-and-forth.”
“Highlighting key passages in my course readings makes exam prep so much faster. Free and nothing uploads — perfect for a student budget.”
“I flag the numbers that matter in monthly reports before sending them up the chain. Quick, clean, and private.”
Yes. Pick from a set of preset colors so you can distinguish different kinds of notes — for example yellow for key facts, blue for questions.
Never. All processing happens locally in your browser using JavaScript. Your files never leave your device, so nothing is stored or shared.
No. Your downloaded PDF is clean — no logos, no stamps, and no hidden pages added by us.
Yes. The tool is mobile-first and works on iPhone, Android, and any device with a modern browser.
Yes. Click the highlighted span again to change its color or remove the highlight before you download.
No server-side limit — the only constraint is your device's memory. Most PDFs up to 200 MB open without issue on a laptop or desktop.