Compare PDF Online Free - View Two PDFs Side by Side

Compare two PDF documents side by side online for free. Navigate pages in sync to spot differences visually. No signup, no upload to servers.

Load two PDF documents side by side and compare them page by page. Useful for reviewing changes between document versions, checking translations, or validating edits.

Upload your PDF to get started — no sign-up required.

How to Compare Two PDFs Online

  1. Upload Document A using the left panel.
  2. Upload Document B using the right panel.
  3. Both documents render side by side at matching scale.
  4. Use the Prev/Next page buttons to navigate through pages in sync.

Why Use PDFCrush?

  • Renders both PDFs side by side at the same scale for easy visual comparison
  • Synced page navigation moves through both documents simultaneously
  • Works with PDFs of different page counts - continues past the shorter document
  • No upload needed - both PDFs render locally in your browser

Your Privacy & Security

Both PDF files are rendered locally using pdfjs-dist. Neither file is uploaded to any server at any point.

Frequently Asked Questions

Does the comparison utility highlight character level text modifications automatically?

Yes. The diff engine checks text strings across parallel layout coordinates, visually highlighting matching, missing, or changed text blocks so you can easily spot differences.

Can I compare two separate versions of a document that have different page counts?

Yes. The tool side by side split workspace allows for independent scrolling or synchronized page navigation, letting you track changes even if new pages were added.

Will the tool catch visual layout changes if the text stays the same?

Yes. The side by side workspace displays pixel accurate renderings of both layouts, allowing you to easily identify visual changes like shifted image margins, font swaps, or logo modifications.

Are my confidential contracts or legal files uploaded to a server to run the comparison?

No. The document diff analysis executes locally using client side comparison scripts. Your proprietary business data and legal records are processed safely within your machine's physical limits.

Does this tool support comparing flat scanned pages or blueprints side by side?

Yes. The rendering pipeline processes flat scanned pages visually just like native digital text, letting you compare structural blueprints side-by-side cleanly.

Can I lock the scrolling panels so both documents scroll together?

Yes. The panel layout features a synchronization toggle that locks the parallel scrollbars together, enabling convenient layout verification.

Is it possible to zoom into fine table cells during comparison?

Yes. The workspace layout includes coordinate magnification controls, allowing you to zoom in and check fine print columns cleanly.

Does the system display specific deletion markers for missing line elements?

Yes. The comparison tool tracks structural omissions and displays highlighted indicators where lines have been removed between versions.