Compare PDF
Visual difference between two PDFs
Last updated:PDF comparison renders one page from each of two PDFs and computes a pixel-level visual diff, highlighting changed regions and showing an overall percentage difference. LlamaPDF uses pdf.js to render and a canvas-based diff in your browser. Useful for spotting layout or content changes between document versions.
PDF 1
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PDF 2
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How to compare two PDFs
- 1
Upload both PDF files — the original and the revised version — by dragging them into the boxes above or clicking to browse.
- 2
The tool analyzes both documents and highlights every difference: added text, deleted text, moved content, and formatting changes. Navigate through changes one by one or view a side-by-side comparison.
- 3
Review the highlighted differences and optionally download a comparison report. All processing happens in your browser — neither document ever leaves your device.
Why use our PDF comparison tool?
When contracts are revised, reports are updated, or designs go through review cycles, it's critical to know exactly what changed between versions. Manually scanning two documents side by side is slow and error-prone — subtle word changes, deleted clauses, or shifted paragraphs are easy to miss, and the consequences of overlooking a change can be significant. Our PDF comparison tool automates the process, detecting every text difference and presenting them in a clear, color-coded visual format. Added text, removed text, and modified sections are each highlighted distinctly so you can review changes with full confidence. This is especially valuable for legal teams tracking contract redlines, editors reviewing manuscript revisions, or compliance officers verifying policy updates. Because comparison runs entirely in your browser, confidential documents stay completely private — nothing is uploaded to any server.
After identifying changes, you can use our PDF editor to make further revisions, sign the final version, or merge the approved document with other files for distribution. The tool is free, requires no account or software installation, and works on any device.