Compare PDF
Find the differences between two versions of a PDF.
Processed in your browser. Files are never uploaded.
Original PDF
The older version
Max file size: 100MB
Revised PDF
The newer version
Max file size: 100MB
Shows words added and removed on each page. Best for contracts and reports.
Compare PDF online, free and secure
Compare two versions of a PDF to see exactly what changed. Text mode highlights words added and removed on each page, which is ideal for contracts and reports. Visual mode overlays the pages and marks every changed pixel, catching layout, image, and formatting edits.
How to compare pdf
Upload both versions
Add the original PDF and the revised PDF.
Choose the comparison
Pick text changes or visual changes, and whether to show only pages that changed.
Review the differences
Added text is green, removed text is red, and visual changes are marked in red on the page.
Why use Kobra PDF to compare pdf
- Word-level text differences
- Pixel-level visual differences
- Confidential drafts stay on your device
Compare PDF: frequently asked questions
- Which comparison mode should I use?
- Use text mode to review wording changes in contracts, policies, and reports. Use visual mode for designs, drawings, and scanned documents, or to catch formatting changes.
- Why does text mode show a whole page as changed?
- Pages are compared by position, so inserting a page shifts everything after it. Large reflows can also make text move between pages.
- Can I compare scanned PDFs?
- Use visual mode, or run both files through OCR PDF first so text mode has text to compare.
- Are my documents uploaded?
- No. Both files are compared in your browser and never leave your device.