Compare PDF
See what changed between two versions of a PDF
See exactly what changed between two versions of a PDF. Removed words are marked in red and added words in green, side by side.
- Done in seconds
- No sign-up needed
- Free, no watermarks
How it works
How to compare two PDFs
- 01
Drop the original PDF and the changed version into the upload area, together or one at a time.
- 02
Check that the original is on the left, and use Swap if it is the other way around.
- 03
Scroll through both documents side by side, or click a change in the list to jump straight to it.
- 04
Click Download report to save a PDF summary with every change highlighted.
Word-by-word differences
Every added, removed or reworded word is found, even when text has moved to a different page.
Side-by-side view
Both versions scroll together, with removals highlighted in red on the original and additions in green on the new version.
Shareable change report
Download a PDF with a summary, a numbered list of every change and the new version with its additions highlighted.
Questions
Frequently asked
What does Compare PDF check?
It compares the text of both documents word by word and shows what was added, removed or changed. Images, colors and layout are not compared.
Can I compare scanned PDFs?
Scanned pages are images, so they have no text to compare. Run them through PDF OCR first, then compare the results.
What if a paragraph moved to another page?
The comparison runs across the whole document, not page by page, so text that simply shifted to the next page is not flagged as changed.
Is Compare PDF free?
Yes. It is free to use, with no sign-up and no watermarks.
Can I compare PDFs on my phone?
Yes. CrestPDF works in any modern browser on Windows, Mac, Linux, iPhone, iPad and Android. On a phone you can switch between the original and the changed version.
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