Compare Two PDF Files Online
Compare two PDFs and review page-by-page text changes.
PdfnMore detects added and removed selectable text. Visual mode additionally renders both documents and measures material pixel differences, which can catch image, chart, formatting and geometry changes.
Both PDFs are uploaded only after you press Compare PDFs. No permanent document library copy is created by this comparison.
How PDF comparison works
Upload an original PDF and a revised PDF, then PdfnMore extracts selectable text page by page and highlights added and removed content so you can review what changed.
Select your file
Choose the supported file from your device or drag it into the upload area.
Set the action
Choose the pages or settings needed for this tool.
Download and check
Open the result and verify it before replacing your original file.
Review added and removed PDF text
Compare PDF is useful for contracts, policies, reports, drafts and other documents where you need a quick text-level difference check without manually reading both files side by side.
Choose text or optional visual comparison
The current comparison is text-based. It detects page-count changes and selectable-text differences, but it does not yet compare images, charts, formatting, colors or page geometry at the pixel level.
The current production comparison supports two PDFs up to 50 MB each and up to 150 pages per file for text comparison. Optional pixel-level visual comparison is available for up to 30 page positions. Very large text/diff payloads are limited for safety.
Frequently asked questions about Compare PDF
What does Compare PDF check?
V1 compares selectable text page by page, reports added and removed text, and identifies page-count differences between the two documents.
Can I compare scanned PDFs?
Scanned or image-only PDFs usually need OCR first. Run OCR PDF on both files, then compare the OCR results.
Does it compare images and formatting?
Yes, when optional visual comparison is enabled. PdfnMore renders both documents and measures material pixel differences in addition to the selectable-text comparison.