Compare PDF Files
Upload two PDF documents and instantly see what changed between versions. Side-by-side view, overlay diff, and slider comparison.
How to Compare PDF Files
Upload the original PDF file using the left drop zone
Upload the modified PDF file using the right drop zone
Choose a comparison mode: side-by-side, diff overlay, or slider
Navigate through pages to review all changes
Why Use Our PDF Comparison Tool?
100% Private
Your files never leave your browser. All processing happens locally on your device, so your documents stay completely private.
Visual Diff Detection
Our pixel-level comparison highlights every difference between your PDFs, from text changes to moved images and layout shifts.
Multiple View Modes
Compare documents side by side, view a color-coded diff overlay, or use the interactive slider to swipe between versions.
Free, No Sign-up
Use the tool as many times as you want, with no account required. No watermarks, no limits, no hidden fees.
Frequently Asked Questions
How does the PDF comparison work?
The tool renders each page of both PDFs as images, then performs a pixel-by-pixel comparison to detect visual differences. Changed areas are highlighted in red for easy identification.
Is my data safe?
Yes. Your PDF files are processed entirely in your browser using JavaScript. No data is sent to any server. Once you close the page, the files are gone.
What types of changes can the tool detect?
The tool detects any visual change: text edits, font changes, image modifications, layout shifts, added or removed content, color changes, and more.
Is there a page or file size limit?
Each PDF can have up to 50 pages and be up to 50 MB in size. These limits ensure smooth performance in the browser.
Can I compare PDFs with different page counts?
Yes. Pages are compared by their position (page 1 vs page 1, page 2 vs page 2). If one PDF has more pages, the extra pages are shown without comparison.