Free PDF Comparison Tool
Compare any two PDF files in your browser, free to try. Get a visual diff with every change highlighted, then pay only when you need to export annotated results.
Free previews, paid exports
You can compare two PDFs and view the detected changes for free — every visitor gets free preview analyses to test the tool on real files. When you're ready to export annotated PDFs or process large batches, choose between pay-per-use ($1.90/drawing) or a Pro subscription.
What you get for free
Free previews
Upload and analyse PDFs without paying or signing up.
Visual diff viewer
See every change highlighted on the page in your browser.
Adjustable sensitivity
Tune the comparison for your specific documents.
No installation
Runs in any modern browser — Chrome, Firefox, Safari, Edge.
When to upgrade
Free previews are perfect for testing the tool and reviewing single drawings. If you regularly review revisions, want to export annotated PDFs, or need to process batches via ZIP upload, the Pro plan ($19/month for 50 drawings) pays for itself almost immediately. Pay-per-use is ideal for occasional bulk reviews.
Start comparing now
No credit card required to test it.
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