Drop or click
Drop or click
Files processed locally — never uploaded
Also try: AI Humanizer · Summarizer · Rewriter 3 free uses/day
How It Works
1
Upload 2 PDFs
Original and revised versions.
2
Auto-compare
Text extracted and diffed page by page.
3
Review changes
See additions, removals, and unchanged text.
FAQ
How does PDF comparison work?
Upload two PDFs. The tool extracts text from each page and shows a side-by-side diff highlighting additions, removals, and changes.
Does it compare visually?
Currently text-based comparison. Visual (pixel-level) comparison is planned.
Are my PDFs uploaded?
No. pdf.js extracts text entirely in your browser.
Can I compare different versions of a contract?
Yes. Upload the original and revised version to see exactly what changed.
Does it handle multi-page PDFs?
Yes. Pages are compared in order — page 1 vs page 1, etc.
What if the PDFs have different page counts?
Extra pages in either document are shown as entirely added/removed.
Does it work with scanned PDFs?
No. Only embedded text is compared. Use OCR first for scanned documents.
Can I download the diff report?
Copy the diff output or take a screenshot. Downloadable reports are planned.
Does it highlight specific changes?
Yes. Added text is highlighted green, removed text is red, unchanged text is normal.
Is there a page limit?
No. Works with any PDF size.
Does it work on mobile?
Yes.
How accurate is the comparison?
Very accurate for text content. Layout differences are not detected.
Can I compare Word docs?
Convert to PDF first using our <a href="/ai/pdf/word-to-pdf">Word to PDF</a> tool, then compare.
Is it free?
Yes. Completely free.
Can I pay with crypto?
PDF tools are free. See all <a href="/ai/pdf">PDF Tools</a>. AI writing tools accept crypto from $9.99/month.
Do more with your documents
Summarize, rewrite, or translate the text in your PDFs with AI.
Compare two PDF documents to see exactly what changed. Text-based diff with additions highlighted green and removals in red.