How to use this tool
- Choose exactly two PDFs in the correct order.
- Select the comparison sensitivity.
- Create and review the highlighted comparison PDF.
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Compare PDF Files Online
HugPDF compares PDF files locally in the browser. Files are never uploaded to a server for comparison; the tool compares rendered page pixels and highlights visual differences. It does not interpret text meaning, and layout shifts can produce many highlighted areas.
HugPDF — free PDF tools that run in your browser. No uploads, no account, no watermark.
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Local processing
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Your result
Compare revised reports, proofs and layouts
Select the older document first and the revised version second. Start with medium sensitivity and inspect highlighted pages. Higher sensitivity can reveal subtle changes but also mark small rendering differences.
The comparison examines rendered pixels, not sentence meaning or tracked changes. Shifted layouts and inserted pages can produce many differences. Check important changes against both originals.
What this tool does
Both files are rendered locally page by page. HugPDF compares their visible pixels and creates a new PDF that marks additions, removals and layout differences in red without sending either document to a server.
Your files stay with youDocument processing runs locally in your browser. We do not receive, store or inspect the files you select.
FAQ
Frequently asked questions
Does this compare text or appearance?
It compares rendered appearance, so font, image, spacing and page-size changes can all be detected.
What happens when a page exists in only one file?
The unmatched page is compared with a blank page and its visible content is highlighted.
Does the tool compare text meaning?
No. It compares visible pixels and highlights visual differences. It does not interpret meaning or produce a semantic list of text edits.