Compare PDFs
Upload two PDFs and see exactly what changed between them. The tool pairs pages intelligently, detects differences in text, images, annotations, headers, and formatting, and presents them in a side-by-side or overlay view.
How It Works
- Upload two PDF files -- the original (left) and the revised version (right).
- The tool pairs pages between the documents using content signatures.
- Select a view mode: Side by Side or Overlay.
- Navigate between page pairs using the pagination controls.
- Differences are highlighted and categorized. Use the filter panel to focus on specific change types.
- Optionally export the comparison as a PDF report.
Features
- Automatic page pairing based on content similarity
- Side-by-side and overlay comparison views
- Change categorization: text, image, header/footer, annotation, formatting, background
- Per-category filter toggles to show or hide specific change types
- Text change search with query filtering
- OCR support for comparing scanned documents
- Zoom controls for detailed inspection
- Synchronized scrolling between panels in side-by-side mode
- Export comparison results as a PDF
Options
| Option | Description |
|---|---|
| View Mode | Side by Side or Overlay |
| OCR | Enable/disable OCR for scanned document comparison |
| OCR Language | Language for OCR text extraction |
| Category Filters | Toggle visibility of text, image, header/footer, annotation, formatting, and background changes |
| Change Scope | In overlay mode, filter between all changes or content-only |
| Zoom | Adjust magnification level for detailed inspection |
Use Cases
- Reviewing contract revisions to find exactly what changed between versions
- Comparing design mockups to verify that PDF exports match expectations
- Auditing document changes in regulated industries where every edit must be tracked
- Verifying that a PDF conversion process preserved the original content accurately
- Checking translation documents against the source for layout changes
Tips
- The overlay view stacks both documents on top of each other, making spatial differences (shifted elements, resized images) immediately visible.
- Enable OCR when comparing scanned documents that do not have a text layer. The comparison engine will extract text from page images.
- Use category filters to focus on what matters. For example, hide formatting changes when you only care about text content differences.