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Free PDF Compare

Free PDF compare with no upload: see what changed between two versions as a word-level text redline or a visual diff, in your browser.

Many PDF compare tools upload both documents to a server β€” here they're compared on your device.

Original (A)

Drop a file here, or click to browse

PDF Β· processed on your device

or press Ctrl+V to paste from your clipboard

Browse files
Changed (B)

Drop a file here, or click to browse

PDF Β· processed on your device

or press Ctrl+V to paste from your clipboard

Browse files

Your files never leave your device. All processing happens locally in your browser.

Drop two PDFs to find what changed β€” a word-level text redline, or page by page side by side, overlaid or highlighted. Free and no upload: both files stay in your browser, unlike server-based compare tools.

Common uses

  • Compare Two Contract VersionsSpot exactly what changed between two drafts of an agreement.
  • Review Document RevisionsCheck what an editor or collaborator changed in a revised PDF.
  • Compare Invoices or StatementsFind changed figures between two versions of a financial document.
  • Compare Design ProofsVerify changes between two versions of a printable proof or layout.
  • Compare Paper or Thesis DraftsSee what changed between two versions of an academic document.

How It Works

Tools like Draftable and Adobe charge for good PDF comparison, and PDF24 uploads your files. This compares two PDFs visually in your browser β€” neither file leaves your device.

  1. 1
    You drop in two PDFs
    An "original" (A) and a "changed" (B). Both are rendered locally with pdf.js.
  2. 2
    Each page is rendered to an image
    The matching page from each document is drawn to a canvas at the same scale, in your browser.
  3. 3
    You choose how to compare
    Side by side, an onion-skin overlay with an opacity slider, or a pixel-difference view that highlights changed areas in red and reports the percentage changed.
  4. 4
    You page through the documents
    Step through every page; pages that exist in only one file are flagged.

Contracts and drafts are sensitive, and most comparison tools upload them. Here everything is rendered and compared on your device β€” ideal for reviewing revised agreements, statements, and documents privately.

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Frequently Asked Questions