PDF Visual Compare

Compare two PDFs pixel by pixel to catch layout shifts, font-rendering drift, color changes and image swaps that text comparison misses.

Add the original and the revised PDF to compare them side by side.

Open the comparison workspace

Two PDFs · up to 50.0MB each

Multi-file input
Long-running / async
Visual comparison workspace

Unlike PDF Redline Compare, which diffs text content, this tool diffs what a page actually looks like when rendered - catching a moved element, a resized image, a recolored field, or a swapped picture in the same position, none of which change the underlying text. Pick pixel-level, a tolerant structural-similarity check, or a fast perceptual-hash pre-screen, and review results side by side, as a ghosted overlay, or as a difference heat-map. It only reads both files; nothing is changed.

Simple workflow

How it works

1
Add both PDFs

Add the original and the revised document.
2
Compare

Pick a comparison method and sensitivity, then review flagged pages.
3
Review

Step through flagged pages in Side-by-Side, Overlay or Difference Map view, then export a report.

Frequently asked questions

How is this different from PDF Redline Compare?

Redline Compare reads and diffs the text itself - it tells you what words changed. This tool renders both PDFs as images and compares the pixels, so it catches things text-diffing cannot: a shifted layout, a different font rendering, a recolored field, or a swapped image occupying the exact same text and position.

What is "perceptual hash" mode for?

It is a fast, coarse pre-screen - good for quickly finding which pages of a large document are worth a full pixel or structural-similarity pass, not a detailed comparison on its own. It flags pages as different or not, without highlighting specific regions.

Is the "moved" or "resized" label always correct?

No - these are best-effort classifications based on comparing a changed region and a modest area around it, meant to help you scan results faster. Treat them as a starting point for your own review, not a certified diagnosis.

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