Free online PDF compare tool. Side-by-side comparison of two PDF files, view differences page by page with highlighted changes. Supports text layer comparison and visual diff. Pure frontend, files stay on your device.
It uses PDF.js to render two PDF files locally in your browser, displayed side by side page by page. Text is extracted and compared with a diff algorithm to highlight differences.
Two modes: 1) Text comparison - extracts and compares text from both PDFs; 2) Visual comparison - side-by-side page viewing of rendered PDFs.
Text comparison accuracy depends on the PDF text layer quality. Scanned PDFs cannot use text comparison but visual comparison mode still works.
Yes, but it is recommended to keep files under 50 pages each and under 50MB. Larger files may cause performance issues.
Files are fully secure. This tool runs 100% in your browser using PDF.js for local rendering and processing. Files never leave your device.
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