Spot visible changes between two PDF versions
Choose the earlier document and the revised document. FigureOwl renders matching page numbers at the same scale, shows both versions side by side and marks changed pixels in red. Move through the pages to review revised wording, replaced images, spacing changes and added or removed pages.
Adjust the comparison sensitivity
PDF rendering can produce tiny edge differences around letters and images. Move the sensitivity control toward “Fewer” to ignore more anti-aliasing or compression noise, or toward “More” when small visual changes matter. The percentage is the share of rendered pixels that differs on the current page; it is not a quality or similarity score.
When visual PDF comparison is useful
- Review an agreement, proposal or policy against an approved version.
- Check whether a design, drawing or presentation changed before sharing it.
- Find pages added to or removed from a revision.
- Inspect scans where selectable text comparison is unavailable.
Know the limits before relying on the result
This is a page-by-page pixel comparison, not a semantic or legal review. A line wrapping differently can highlight a large region even when the wording is similar. Reordered pages are compared by page number. Hidden text, metadata, comments, attachments, form values that are not visibly rendered, and certificate status are outside the comparison. Always read important changes in context.
Private browser-local processing
Both PDFs are rendered and compared locally on your device. FigureOwl does not receive or store them. For reliable browser performance, each file is limited to 100 MB and 30 pages.