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PDFlys

Compare PDF

Compare PDF

Compare two PDF files side by side with highlighted differences

Drop PDF A or click to browse

or click to browse

Drop PDF B or click to browse

or click to browse

Your files never leave your browser

Side-by-Side View

Both PDFs are displayed next to each other with synchronized page navigation. Scroll through both documents together.

Difference Highlighting

Text and layout differences are highlighted in color so you can quickly identify what changed between versions.

Browser-Based

Both documents are compared entirely in your browser. Neither file is uploaded to a server.

How to Compare PDF Files Online

  1. 1

    Open the PDFlys Compare tool.

  2. 2

    Upload the original PDF and the revised PDF.

  3. 3

    The tool displays both documents side by side.

  4. 4

    Differences are highlighted automatically.

  5. 5

    Scroll through the documents to review all changes.

FAQ

What types of differences does it detect?▾
The tool highlights visual differences between pages — changes in text, images, layout, and positioning are all detected through pixel-level and text-layer comparison.
Can I compare PDFs with different page counts?▾
Yes. The tool compares pages in order. If one PDF has more pages than the other, the extra pages are shown without a comparison counterpart.
Is the comparison done in my browser?▾
Yes. Both PDFs are loaded and compared entirely in your browser. Neither file is sent to a server.
Can I compare scanned PDFs?▾
Yes. The visual comparison works on any PDF, including scanned documents. It compares the rendered appearance of each page.
Can I export the comparison results?▾
You can take screenshots of the highlighted differences. A dedicated export feature for comparison reports is on the roadmap.