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PDF Compare | Review Text Changes by Page

PDF Compare | Review Text Changes by Page

Compare two PDFs locally without uploading. Align inserted or removed pages, highlight text changes, and inspect side-by-side page previews.

Focus mode

20 MB and 100 pages per file · 2,000,000 characters combined

Compares extracted text, ignoring whitespace and line breaks. Font, image, and layout-only changes are not detected. Matching text does not certify visual or legal equivalence. OCR is not included.

Documents are processed only in your browser. Files are never uploaded or modified.

Key features

  • Aligns pages around matching text after page insertions or deletions.
  • Highlights added and removed text with navigation between changed pages.
  • Renders selected pages side by side with optional synchronized scrolling.
  • Marks textless pages as unknown and supports cancellation.

How to use

  1. Choose an original PDF and a revised PDF.
  2. Select Compare text and follow page extraction progress.
  3. Navigate between changes or select a page pair to inspect text and visual previews.

Examples

  • Review document revisions

    Find added or removed wording between versions of a notice or report.

  • Review documents with inserted pages

    Keep later matching pages aligned when a revision adds pages in the middle.

Privacy

PDF parsing, text comparison, and previews run in your browser. Files are never uploaded or modified.

Requirements

Up to 20,000,000 bytes and 100 pages per file; 2,000,000 extracted characters combined. Protected or damaged PDFs are unsupported. Whitespace and line breaks are normalized. No OCR or image, font, or layout comparison. Large pages use whole-text replacement highlighting; display is limited to 40,000 characters per page.

Common questions

Does matching text mean the PDFs are identical?
No. Only extracted text is compared, ignoring whitespace and line breaks. Images, fonts, layout, and annotations may differ. This tool does not establish legal equivalence.
Can I compare scanned PDFs?
Pages without selectable text are marked unknown. You can inspect rendered previews, but OCR and automated image comparison are not provided.
How are inserted pages aligned?
Sequences of matching normalized page text serve as anchors. Unmatched pages between anchors are compared in order, with surplus pages marked added or removed. Moved pages or repeated content can make matching ambiguous.

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