Drop the old and new revisions.
Drawing Overlay
Overlay a page from two PDF revisions at the same scale: old in red, new in blue, unchanged in dark. Pair pages, nudge the alignment, adjust the opacity, and save the view as a PNG.
Good to know
- This compares pixels, not objects, so a small shift between sets makes everything look changed. Use the nudge to line them up.
- Differences are shown for you to read. Nothing here decides what counts as a real change.
- The PDFs are never changed. The only output is the PNG.
Your files stay on your machine
This tool runs entirely inside your browser tab. Nothing is uploaded, stored, or sent to a server — close the tab and every trace is gone.
These are the free ones — see the full suiteHow big a file can it take?
There is no upload, so there is no upload limit — but the work happens in this tab, which means your browser’s memory is the budget. Nothing here will refuse a file for being large; a big enough one simply gets slow and, eventually, reloads the tab. The figures below are rules of thumb on a desktop browser, not enforced caps. On a phone or tablet, expect a good deal less.
- Two pages are rendered at once at the chosen scale, so a large-format sheet at high resolution is the limit: comfortable up to about 30 megapixels.
- One pair is drawn at a time, so page count barely matters.
Password-protected PDFs are declined whatever their size — unlock the file first. If a run does die on a long document, splitting it into volumes and working through them one at a time is the reliable way round it.