Compare PDFs
Free online tool to compare pdfs quickly and privately in your browser.
How to Compare PDFs Online for Free
The Compare PDFs tool helps you find differences between two PDF documents quickly and accurately. Upload the original and the revised PDF, and the tool compares text, images, formatting, page order, and other document elements. It highlights all detected changes so you can review them easily.
It’s perfect for contracts, reports, invoices, legal documents, research papers, manuals, and document revisions.
Key Benefits
- Compare two PDF files instantly.
- Detect text and formatting changes.
- Find added, removed, or modified content.
- Compare images and page layouts.
- Highlight differences clearly.
- Fast browser-based processing.
- Works on desktop and mobile.
- No registration required.
- Free to use.
- Easy for everyone.
Practical Use Cases
- Compare contract revisions.
- Review legal documents.
- Check updated reports.
- Verify invoices.
- Compare research papers.
- Review edited manuals.
- Compare business proposals.
- Check document versions.
- Review proofreading changes.
- Verify final documents before sharing.
Features
- Side-by-side PDF comparison.
- Text difference detection.
- Image comparison.
- Formatting comparison.
- Page-by-page comparison.
- Highlight added and deleted content.
- Difference summary report.
- Supports multi-page PDFs.
- High-quality comparison results.
- Browser-based processing.
Why Choose This Tool?
- Compare PDF documents in seconds.
- Quickly identify every change.
- Simple and beginner-friendly interface.
- Accurate comparison of text, images, and formatting.
- Works directly in your browser.
- Fast, free, and reliable.
How to Use This Tool
Drag your file here or click to choose one from your device. It stays local.
Choose your settings or edit your file directly in the workspace container.
Click the process button and save the new file straight to your downloads.
Why Use This Tool?
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100% Private
Your files never leave your device. All processing happens in your browser using WebAssembly technology.
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Instant Processing
Powered by WebAssembly for lightning fast results, with no server wait times or queues.
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Free Forever
No registration, no subscriptions, no hidden costs. Unlimited usage for everyone.
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Works Everywhere
Compatible with Chrome, Firefox, Safari, Edge on desktop and mobile devices.
Frequently Asked Questions
Is Compare PDFs free to use?
Yes, absolutely! Every single tool here is completely free. There are no limits, no hidden subscription costs, and you don't even have to sign up or share your email address. Just use it as much as you need.
Is it safe to compare pdfs online?
Yes, it is 100% safe. Most online PDF tools copy your files to their servers, but we don't. We use a browser-based technology called WebAssembly to do all the heavy lifting locally on your own computer. Your files never leave your device.
What file size can I process?
Because the tools process your files directly on your computer, we don't impose any file size limits at all. The only limit is what your computer or phone can handle, meaning you can easily edit files that are 100MB or larger.
Do I need to install any software?
No, you don't need to download or install anything. All you need is a standard web browser (like Chrome, Safari, or Firefox). Just load this page, drag in your file, and you're good to go.