How to use this tool
- Choose exactly two PDFs in the correct order.
- Select the comparison sensitivity.
- Create and review the highlighted comparison PDF.
Organize PDF
Compare PDF
Compare two PDFs visually and highlight changed areas in red.
- ✓Local processing
- ✓No sign-up
- ✓Files never uploaded
Local processing
Compare PDF
No sign-upFiles never uploaded
Drop files here or choose from your deviceUp to 50 MB per file
Selected files
Files never uploaded
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Your result
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.
How to use compare PDF files online safely
Compare two PDFs visually and highlight changed areas in red. Review revised contracts, reports, proofs and exported layouts by creating a visual difference copy that clearly marks changed areas.
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. The operation runs on your device: HugPDF does not send the document, its contents or a password to a processing server. You can keep the source file and inspect the new copy before sharing it.
It works in modern desktop and mobile browsers. Processing time depends on the file size and your device, so keep the page open until the download is ready and review the output before relying on it.
For the best result: Place the older file first and the revised file second, then adjust sensitivity if anti-aliasing or tiny rendering shifts create too many marks.
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.