Compare PDF Files Online — Find Differences Free
Upload two versions of a PDF and see exactly what changed. Additions are green, deletions are red, and modified sections are highlighted — ideal for contracts, reports, and draft review.
How to compare pdf online — 3 easy steps
- Step 1: Upload the original PDF.
- Step 2: Upload the revised PDF to compare against.
- Step 3: Review highlighted differences and download the comparison report.
Why use FileMasterPDF to edit and annotate PDF files
- Non-destructive: the original PDF is never modified, only a new output is created.
- 100% private: editing runs in your browser — nothing is uploaded.
- No specialist software: works in any modern desktop or mobile browser.
- Instant results: changes are applied and downloadable in seconds.
- Free forever: no account, no daily limits, no watermarks.
Frequently asked questions — Compare PDF
Can it compare scanned PDFs?
Run OCR PDF first for scanned documents, then compare.
How are differences shown?
Additions green, deletions red, changes in yellow.
Can I compare PDFs with different page counts?
Yes — extra pages are flagged as entirely added or removed.
Is my data secure?
Yes — comparison runs in your browser with no upload.