PDF Compare Tool
Visually compare two PDF files side-by-side.
A secure, browser-based tool to find visual differences between PDF documents. Highlight layout changes, text edits, and graphic updates instantly without uploading your files.
Professional PDF Diff Tool
Detecting changes between two versions of a PDF contract, manual, or design proof can be tedious and error-prone. A missed clause or a shifted image can have serious consequences.
Diff Guru's PDF Compare tool automates this process. We render your documents with high fidelity and perform a visual scan to highlight every pixel that has changed. It's like a light table for the digital age, ensuring you never miss a difference.
Why use this tool?
Visual Precision
See layout shifts, font changes, and graphic updates instantly.
Client-Side Security
Your sensitive documents are processed in your browser, not our servers.
Multiple View Modes
Use Overlay, Slider, or Side-by-Side views to analyze changes your way.
How to Compare PDF Files
Upload
Drag and drop your "Original" and "Changed" PDF files into the tool.
Render
The tool instantly renders the first page of both documents for comparison.
Review
Use the navigation controls to flip through pages and spot red highlighted differences.
PDF Comparison FAQs
Our tool works visually. It renders the pages of your PDFs into high-resolution images within your browser and then compares them pixel-by-pixel. This allows it to detect layout shifts, font changes, and missing text with 100% accuracy.
No. Security is our priority. We use client-side technology (PDF.js) to process your documents directly in your web browser. Your confidential contracts, reports, or manuscripts never leave your device.
Yes. You can navigate through the pages independently or sync them. If one document is shorter, the tool will simply allow you to view the remaining pages of the longer document without a comparison counterpart.
It highlights visual differences. If text has changed, moved, or been deleted, those pixels will be highlighted in red. This is often more reliable than raw text extraction for ensuring the final document layout is correct.
There is no hardcoded limit, but very large PDFs (e.g., hundreds of megabytes) may be slower to render depending on your computer's available memory, as all processing happens locally.