Editing with AI.
Point at the sentence. Do not describe it.
Telling an AI what to fix is the hard part. Mark the PDF it made, copy the list, paste it back. Every edit carries its page and its exact words, so nothing gets guessed.
Your PDF never leaves your device.
Red Pen
Mark up any PDF. Send back exactly what changes.
Because "the bit near the bottom of page six" is not an edit.
Or drop one anywhere. It never leaves your device. No account.
Try it. Pick a word, then say what should happen to it.
Supply and fit three oak shelves. Delivery is free within town. Total due on fit.
What Copy edits gives you
1 edit: 1 replace 1. Page 1, You, replace: "free" with "$40" Apply these to the source. Quote any entry you cannot place.
Sending changes back.
One list, not three emails and a phone call.
A quote with the wrong price. A contract with the wrong date. Strike it, write what it should say, say whether you approve, and send one list they cannot misread.
Just reading.
Read it like a book, not a web page.
Two pages side by side. Drag the edge to turn. Pinch into the small print. When something needs fixing, pick up the pen.
Questions
How do I give an AI exact edits to a PDF?
Open the PDF in Red Pen, mark what should change, and tap Copy edits. You get a list with the page, the exact words and the change for each edit. Paste it into ChatGPT, Claude or any AI and ask it to apply them.
Is my PDF uploaded anywhere?
No. Red Pen opens the file in your browser. The PDF, its text and your marks stay on your device.
Do I need an account?
No. Red Pen is free and works without signing in.
Can I mark a whole section, not just words?
Yes. Use Area to draw a box or a loop around a table, a picture or a whole page, then delete it, replace it or comment on it.
How do I send my corrections to someone?
Tap Copy edits and paste the list into an email. Add a sign-off, such as "Approved once these edits are made", so they know what happens next.
Can I just read a PDF?
Yes. Read mode shows two pages side by side and turns like a book. Highlights and notes stay in your browser.