Compare PDF Documents is a free, browser-based tool that extracts text from two PDFs page by page and highlights every line that was added or removed — useful for spotting changes between document revisions.
How to use the Compare PDF Documents
- Upload the original PDF.
- Upload the revised PDF to compare it against.
- Review the line-by-line diff — added lines are marked with +, removed lines with -.
Why use FreeToolsNets's Compare PDF Documents?
- 100% free, with no usage limits and no account required.
- Everything runs locally in your browser — nothing you type is uploaded or stored on a server.
- Works on desktop, tablet and mobile in any modern browser.
- No installation, no plugins, and no ads blocking the tool itself.
Frequently asked questions
Does this compare visual layout or just text?
Just the extracted text content, page by page — visual/formatting differences (fonts, colors, positioning) aren't detected.
Will scanned PDFs work?
No — scanned image-only PDFs have no extractable text layer; this tool needs PDFs with real text content.
Is this tool free to use?
Yes, completely free on FreeToolsNets, with no sign-up and no limits.
Is my data sent to a server?
No. Everything runs locally in your browser using JavaScript — nothing you enter is uploaded anywhere.
Does it work on mobile?
Yes, the widget is fully responsive and works on phones, tablets and desktops.