Compare PDF Files
Compare two PDF files and see what text changed — added, removed and identical lines, plus a similarity score. Free, in your browser. — free, fast and private.
How to use Compare PDF Files
- Choose the original PDF and the revised PDF.
- Click Compare PDFs.
- Read the similarity score and the list of added and removed lines, page by page.
Honest limit: This tool compares the extracted text of the two PDFs — it does not compare visual layout, fonts, images or formatting. Scanned PDFs with no text layer have nothing to compare and will report no text.
Frequently Asked Questions
Is comparing PDFs free?
Yes, it is 100% free with no sign-up. Your files never leave your browser.
Does it compare the layout or images?
No. It compares extracted text only — words added, removed or changed. Layout, fonts and images are not compared.
What does the similarity score mean?
It is the share of text lines that are identical in both files, from 0% (completely different) to 100% (same text).
Why does my scanned PDF show no text?
Scanned PDFs are images with no text layer. Run them through our OCR PDF tool first to add searchable text.