Compare PDFs Online
Compare two PDF documents side-by-side to highlight added, removed, and modified text and visual differences.
Select or drag files here to start converting 100% locally in your browser memory.
How It Works
Upload Original & Modified
Select the before and after PDF versions.
Compare
Analyzes text streams and visual layouts in browser RAM.
Review Differences
Inspect side-by-side differences or heatmap overlays.
Export Audit Report
Download a complete HTML audit report of all changes.
Key Features
- ✓ Dual-layer analysis: text stream token diffing and pixel differential rendering
- ✓ Intelligent sequence alignment to detect added, removed, and shifted pages
- ✓ Synchronized side-by-side viewer, difference heatmap, and detailed audit report download
Frequently Asked Questions
Are my confidential documents uploaded to a comparison server?
No. All text extraction, pixel rendering, and diffing algorithms run 100% inside your browser memory. Your documents never leave your device.
What types of differences does this comparison tool detect?
It detects both textual differences (added, removed, or edited words) and visual differences (images, drawings, formatting, stamps, and layout changes).
Can I compare PDFs with different numbers of pages?
Yes. The engine uses sequence alignment to detect added, removed, and shifted pages without misaligning the rest of the document.
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Oreniqe PDF processes your files directly inside your browser's private sandbox using compiled WebAssembly. No bytes of your confidential documents are ever transferred to any cloud server, stored, or indexed. Highly recommended for enterprise professionals, government contracts, and individuals who handle sensitive data.