PDF Coord Marker

Precise PDF coordinate marking — local parsing, privacy-first

PDF Coord Marker helps developers, designers, and document reviewers mark rectangular regions on PDF pages and work with precise coordinates — without uploading your files to any server. Everything runs locally in your browser using PDF.js. Your PDF never leaves your device. WHAT YOU CAN DO • Upload a PDF and open the built-in viewer • Enter Bottom Left / Top Right coordinates (PDF point units, bottom-left origin) • Drag on the PDF to select a region — coordinates fill in automatically • Paste coordinates from JSON or other tool output • Add visual box markers, navigate pages, and zoom • Export annotated PNG or PDF • Switch UI language: English or 中文 WHO IT'S FOR • Developers integrating PDF extraction or layout tools • QA teams verifying document regions • Anyone who needs repeatable, shareable coordinate data from PDFs FREE vs PRO Free (always available): • Unlimited PDF marking and viewing • Core coordinate tools and exports • Exports include a small corner watermark Pro — one-time lifetime license ($9.90 via Gumroad, no subscription): • Watermark-free exports • Batch import (multiple regions at once) • Fine-tune offsets • Custom box styles (color, stroke, fill) • Copy coordinates to clipboard • HD export quality • No ads Purchase Pro on Gumroad, then activate with your purchase email and license key in the extension popup or Settings page. PRIVACY FIRST • PDF parsing and marking happen entirely on your device • No PDF content is sent to our servers • License verification contacts Gumroad’s API only when you activate Pro • Settings and license status are stored locally in Chrome (chrome.storage.local) • Temporary PDF data uses IndexedDB and is cleared when you start a new session PERMISSIONS (why we need them) • storage — save preferences and Pro license status • downloads — save exported PNG/PDF files • tabs — open Gumroad checkout in a new tab when you choose to upgrade Free users may see an optional sponsored Amazon affiliate banner. Pro removes all ads. SUPPORT Questions or license issues: art.lanphoon@gmail.com