Compare PDF Files Online
Upload two PDF files and see every difference highlighted automatically — additions, deletions, and modifications, all detected in seconds. No installation, no downloads, runs entirely in your browser.
Why compare PDFs online?
Desktop PDF tools are slow to install, often expensive, and rarely give you a clean visual overview. With an online PDF comparison tool you can drop two files into your browser, get a result in under a minute, and share annotated output with your team — all without IT having to approve anything.
PDFverifier was built specifically for visual PDF comparison: instead of just diffing text, it analyses the rendered pixels of each page so you catch every visual change — including changes that text-based diff tools miss completely (moved objects, modified line weights, changed graphics).
How it works
- 1. Upload — drag and drop your old and new PDF version into the browser
- 2. Analyse — our engine compares the rendered pages pixel by pixel
- 3. Review — every change appears as a coloured highlight on the drawing
- 4. Export — download an annotated PDF with all changes marked
What you can compare
Single-page documents
Contracts, certificates, reports, scans.
Multi-page PDFs
Manuals, specifications, full document sets.
Drawings & plans
CAD exports, blueprints, architectural plans.
Batch via ZIP
Upload zip files of multiple PDFs and we match them automatically.
Try it on your own PDFs
You get free previews — no sign-up needed to test it on a real file.
Compare PDFs free →