How to Visual Compare Online
Step-by-step instructions to pixel-level visual comparison of two pdfs with ZiaSign.
Why this workflow matters
ZiaSign's visual PDF comparison overlays two documents and highlights every pixel-level difference. Spot layout shifts, moved elements, changed images, and formatting differences that text comparison would miss.
Step by step
Visual Compare is one of the fastest ways to pixel-level visual comparison of two pdfs. Pro access gives you the full workflow.
- 1
Upload original PDF
- 2
Upload modified PDF
- 3
Visual differences are highlighted
- 4
Review the comparison report
Frequently asked questions
How does visual compare differ from text compare?
Visual compare detects pixel-level differences including layout shifts, moved images, and formatting changes — not just text changes.
Can I compare PDFs with different page sizes?
Yes. Pages are scaled to the same dimensions for comparison. Size differences are noted in the report alongside visual changes.
What formats does the comparison output use?
An interactive overlay in the browser highlights differences. You can toggle between side-by-side and overlay views.
Is it accurate for design-heavy documents?
Yes. Pixel-level comparison catches every visual change — color shifts, image swaps, font changes, and element repositioning.
More specific workflows for this tool
Related guides
How to Compare Text Online
Step-by-step instructions to side-by-side text comparison of two pdfs with ZiaSign.
Read guideHow to Diff Report Online
Step-by-step instructions to generate a detailed diff report between two pdfs with ZiaSign.
Read guideHow to Merge PDF Online
Step-by-step instructions to combine multiple pdf files into a single document with ZiaSign.
Read guideReady to run the actual workflow?
You have the steps. Open the tool, process the file, and then move into the next recommendation if the document still needs cleanup, protection, or conversion.