Compare PDF, Find differences between PDFs, free online
Compare two PDF files page by page and automatically highlight differences. Pixel-accurate comparison of text, layout, and graphics. 100% free, no registration, GDPR-compliant.
How it works, Compare PDF in 3 steps
Upload 2 PDFs
Upload the original and the modified version via drag & drop or click. Files up to 100 MB are supported.
Compare
Click "Compare PDFs" and wait for the analysis to complete. Each page is compared pixel by pixel.
Download result
Download the comparison report as a PDF, all differences are highlighted in red and instantly visible!
Compare PDF files online and detect differences
With PDF Monster's comparison tool, you can quickly and reliably find all differences between two PDF documents. The tool analyzes both files page by page and highlights every deviation in color, whether it's changed text, shifted graphics, or adjusted layout. The clear 3-panel report shows original, difference, and modified version side by side.
The entire comparison is free and requires neither registration nor software installation. Your files are transmitted via an SSL-encrypted connection and automatically deleted after processing. This way, you can securely compare confidential contracts, drafts, and internal documents.
Why PDF Monster for PDF comparison?
Pixel-accurate comparison
Each page is analyzed pixel by pixel, no change goes undetected, whether text, image, or layout.
100% Secure & GDPR-compliant
SSL encryption during transmission, automatic deletion after processing. Servers in Germany.
3-panel layout
Original, differences, and modified version clearly side by side, so you can spot every change instantly.
Free without registration
No hidden costs, no subscription model, and no registration required. Ready to use instantly in your browser.
Your data is safe with us
Data security is the top priority at PDF Monster. We know you entrust us with confidential documents, and we take this responsibility seriously.
Encrypted transmission
All data is transmitted via a 256-bit SSL-encrypted connection. Third parties cannot access your files during upload.
Automatic deletion
After processing, your files are automatically removed from our servers. No copies remain.
No sharing with third parties
Your documents are never shared with third parties, not used for advertising, and not permanently stored.
Servers in the EU
Processing takes place on servers in Germany. Compliance with GDPR and European data protection standards is guaranteed.
Typical use cases for PDF comparison
Review contract versions
Compare different versions of contracts to instantly identify all changes to clauses, conditions, and wording. Ideal for lawyers and contract managers.
Proof corrections
Ensure all corrections have been incorporated in the new version. Compare draft and final copy to avoid missing any changes.
Document changes
Find all changes between two document versions, whether text adjustments, deleted paragraphs, or shifted content. Perfect for revision control.
Legislative drafts
Compare legal texts, regulations, or directives in different versions. See at a glance which sections have been changed or added.
Technical drawings
Compare CAD plans and technical drawings in PDF format. The pixel-accurate comparison reveals even the smallest changes to dimensions and lines.
Quality assurance
Check print templates, reports, and forms for unintended changes. Ensure the final version exactly matches the approved document.
Frequently asked questions about PDF comparison
How are differences displayed?
Changes are highlighted with color coding: additions in green, deletions in red. This way you can see at a glance what has changed.
Can I compare only specific pages?
Yes, select the page ranges to compare individually. This is practical for extensive documents when you know where changes might be.
Are only texts compared?
Both text and visual differences are detected. The tool shows textual content changes as well as differences in images and layout elements.
Can I export the result?
Yes, you receive a PDF with all marked differences. You can save this document and share it with others.
Does this work with scanned PDFs?
For scanned PDFs, primarily visual differences are detected. For text comparisons, we recommend processing the documents with OCR first.
Compare PDFs online, without software, right in your browser
PDF Monster offers you a complete collection of free PDF tools. Besides comparing PDFs, you can also edit, compress, merge, or protect your documents. All tools work directly in your browser, are GDPR-compliant, and require no installation or registration.