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.
1. Upload your files (min 2)
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.
🔒 Security & Privacy
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.
📱 Use it on any device
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.
🎁 Always free, no signup
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
For heavier PDF workflows
Amazon affiliateAs an Amazon Associate we may earn from qualifying purchases. This does not add cost for you.
Related PDF tools
More tools you might like
Hand-picked tools that pair well with this one — same audience, same intent.
Compare two PDFs visually — rasterise each page, overlay the two as red/green channels, and produce a PDF that highlights pixel differences.
Compute a SHA-256 checksum of each page's content stream. Use to detect which page(s) changed between revisions of an otherwise-identical PDF.
Find what changed between two PDFs — text-level diff, page by page, output as a side-readable report.
Drop N consecutive revisions of a PDF (v1, v2, v3 …) — get a unified Markdown report showing what changed at each step plus a final cumulative diff.
Quickly see a PDF's page count, file size, and first-page dimensions — no download needed.
Maximum-compression PDF squeeze — re-rasters every page as a JPEG. Big size reduction, but the text becomes non-selectable.
Heuristic PDF/A-readiness audit — checks structural elements (XMP claim, MarkInfo, OutputIntent, tagged structure) and lists what would block strict validation.
Non-binding outline of an intended agreement between parties — captures alignment before formal contract.