Questions
How does it work?
Choose the version you sent last time and the new one. The changes are listed page by page so you can review them. Then download the new PDF with the changes marked and send it along with your new version.
What does the recipient get?
Your new version with a summary first. It lists every change in a numbered table, Before and Now: the old wording struck through in red, the new wording highlighted and changed numbers in amber. On the pages, each change has the same number in the margin and a highlight on the text. The text itself is not rewritten.
Which version gets marked?
The new one. You download the new version with the changes marked, so the recipient reads the current text and sees how it differs from the last one.
Are my files uploaded anywhere?
No. The files are read and compared in your browser, and the marked-up PDF is created there. Nothing is sent to a server, nothing is stored and you don't need an account.
What do the visitor statistics count?
Page views and that a comparison ran, counted with Umami – never file names or content. Want to check? Open your browser's network tab while you compare. No files are sent.
What does it compare?
The text, word by word. Images, drawings and figures are not compared. If your resubmission is mainly about drawings, describe those changes another way.
Does it work with scanned PDFs?
No. A scanned PDF without a text layer can't be compared, because the tool doesn't read text from images (no OCR). Use the original file you scanned or exported from.
Can I leave out references and appendices?
Yes. Reference lists, appendices, the table of contents and page numbers are skipped by default. You see which sections were found and how many changes they hide, and can switch them back on.
Can the recipient rely on the marks?
The tool shows the text differences it finds and flags when a change could not be placed exactly. Tables and multi-column pages can occasionally be read out of order. So review the result before you send it – you are responsible for what you submit.
Does deleted text show in the file?
Yes. Deleted text appears in the summary at the front of the file. Don't send the file if the old version held something the recipient shouldn't see.
What does it cost?
Nothing. There is no sign-up and no built-in file-size limit. Very large documents simply take longer.
Free · Nothing is uploaded