I Hack PDF
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Compare PDF

Create a visual change report from two PDF documents.

Read the guide ↓

What this tool does

Create a visual comparison of two PDFs using rendered page pixels. Spot layout or appearance differences between two versions when a page-by-page visual check is more useful than a text-only comparison.

What you can open
Exactly two PDF documents and a comparison resolution.
What you will download
A PDF report showing visual differences with marked pixels.

How to use it

  1. Add the two versions you want to compare.
  2. Choose a resolution and run the visual comparison.
  3. Read the marked report alongside the original documents to interpret the changes.

Options explained

Resolution, DPI
Set the rendering resolution. Higher values can improve visible detail but use more memory and create larger files.

Know the tradeoffs

  • This is a pixel-based comparison, not an explanation of semantic or legal changes.
  • Rendering differences, fonts or resolution can affect the comparison; it does not certify file identity.

Questions about this tool

Does it describe which sentence changed?

No. It marks visual pixel differences rather than producing a semantic edit summary.

What happens when one document has extra pages?

Missing pages are compared with blank pages in the visual report.