Highlight PDF — mark important parts
Highlight important text and areas — private, no upload
Drop files here
or click to browse — any number of files
Add colored highlights to any PDF directly in your browser. Mark key passages, annotate study materials, or flag contract clauses — with full color and opacity control. Your files are never uploaded anywhere.
Studying & Research: Mark key passages in textbooks, papers, or lecture notes so you can review them later without re-reading the whole document.
Contract Review: Highlight important clauses, deadlines, or obligations before signing or discussing with colleagues.
Document Feedback: Flag sections that need revision, require a second opinion, or contain data to extract — without altering the original text.
Presentations: Call attention to key figures or quotes before sharing a PDF with an audience.
Yes. PDFree processes all highlighting entirely in your browser using pdf-lib. Your PDF is never uploaded to any server — no one sees your document or what you choose to mark. This makes PDFree safe for confidential contracts, medical records, and personal files.