Overprint Audit
Inspect a PDF's graphics-state objects for overprint flags (/OP, /op, /OPM) — surface any unintentional overprint that could surprise you at the press.
1. Upload your file
How does the Overprint Audit work?
Walk every page's ExtGState dictionary and surface graphics states that set overprint flags: /OP (stroke overprint), /op (fill overprint), and /OPM (overprint mode). Overprint is a press-time blending mode where ink layers print on top of one another instead of "knocking out" (replacing) the underneath. Used intentionally for rich black, trapping, and transparency-style effects — but accidental overprint is the no-1 cause of "it looked fine on screen but printed weird" disasters: a white element with overprint set will render invisible because white ink doesn't exist (just absence of ink). Run this audit before sending to press to catch surprises early.
🔒 Security & Privacy
All processing happens on your device. Your files never leave your browser, never touch our servers, and are not stored anywhere. Close the tab and the file is gone.
📱 Use it on any device
Works in any modern browser — Mac, Windows, Linux, iPhone, Android, and tablets. No installation, no app to download. Just open the page and start.
⚡ Quick & easy
Drag, drop, click. Most files process in seconds, not minutes. No watermarks added to your output, no per-day limits, and the tool always shows the result before asking you to download.
🎁 Always free, no signup
Free to use, every time. No account creation, no email required, no “trial” that converts to a paid plan. We make money from ads so you don’t have to pay.