PDF Structure Diff

Compare two PDFs at the structural level — page count, page sizes, font lists, embedding status — so you can spot non-content drift between versions.

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How does the PDF Structure Diff work?

Compare two PDFs at the structural level rather than content. Reports page-count delta, per-page size differences, font lists (added/removed), and metadata field differences. Useful for spotting whether a "minor edit" actually changed the underlying structure (different fonts swapped in, page reordering, paper size changes), or when validating that a redaction pass didn't accidentally alter the document footprint.

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All processing happens on your device. Your files never leave your browser, never touch our servers, and are not stored anywhere. Close the tab and the file is gone.

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Works in any modern browser — Mac, Windows, Linux, iPhone, Android, and tablets. No installation, no app to download. Just open the page and start.

⚡ Quick & easy

Drag, drop, click. Most files process in seconds, not minutes. No watermarks added to your output, no per-day limits, and the tool always shows the result before asking you to download.

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Free to use, every time. No account creation, no email required, no “trial” that converts to a paid plan. We make money from ads so you don’t have to pay.

Frequently asked

Compare Two PDFs runs a text-level diff: which lines were added/removed/unchanged. This tool ignores content and only checks the file's structural fingerprint — useful when content changes are expected but structure changes are not.