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Compare two PDFs change by change

Review searchable text differences and focused visual changes side by side instead of covering the entire page with detection boxes.

PDFArrow aligns corresponding pages, compares extracted words, groups nearby changes, and distinguishes additions, deletions, replacements, and moved text. Image-only pages use focused visual regions. A change navigator and scroll lock make each difference reviewable before report export.

Use Compare PDFs

Example and measured release result

Example input: Original and revised PDF resumes containing additions, removals, and replacements

Expected output: A side-by-side review with a change list and a marked comparison report

Measured result: The regression produced reviewable text changes and a valid marked report PDF

Tests verify grouped changes, navigation, focused regions, and report export. Last tested July 21, 2026 by PDFArrow Product Engineering.

Read the benchmark methodology and download the fixtures

How to use Compare PDFs

  1. Choose the original PDF on the left and the revised PDF on the right.
  2. Run the comparison, then use next and previous controls to review every detected change.
  3. Confirm meaningful changes against both source documents and download the report if needed.

What this tool supports

  • See additions in blue and removals in red.
  • Navigate individual replacements and moved-text changes.
  • Download a marked PDF report after reviewing the comparison.

Common Compare PDFs tasks

  • Reviewing a revised contract
  • Checking an updated policy
  • Comparing two resume or report versions

Privacy, supported files, and limits

Both PDFs are rendered, analyzed, and compared in this browser. Their text and page images are not sent to a document-comparison or AI service.

Browser comparison supports two valid, unencrypted PDFs up to 25 MB and 75 pages each. Searchable PDFs receive word-level additions, deletions, replacements, and moved-text highlights; scanned pages use focused visual regions.

Compare PDFs questions

What changes can PDFArrow detect?

Searchable pages receive additions, deletions, replacements, and moved-text changes. Scanned or image-only pages receive focused visual difference regions.

Can I compare scanned PDFs?

Yes, but pages without searchable text use visual comparison. Running OCR first can provide more useful word-level changes.

What limits apply?

You can compare two valid, unencrypted PDFs up to 25 MB and 75 pages each.

Can I download the comparison?

Yes. After reviewing the results, you can download a marked PDF report.

Are the two PDFs uploaded?

No. Page rendering, text extraction, visual comparison, and report generation run in this browser.

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