FAQ about PDF comparison
This FAQ answers common questions about accuracy, privacy, review limits, and practical use of the tool in construction and planning workflows.
How accurate is the comparison?
The comparison is a strong visual review aid, but it is not the same as a formal technical, contractual, or approval review. The tool surfaces visible deviations quickly; deciding whether those changes are relevant, expected, or critical still belongs to the people who understand the project context.
Why do I see many markers even though little changed?
Common causes are different PDF export settings, slight page shifts, changed fonts, scans, or altered rasterization. In these situations, try a more robust mode, check sheet size and order, and focus on the areas that matter technically instead of reacting only to marker density.
Are my documents uploaded?
In the current implementation, PDF processing for the comparison runs locally in the browser. The loaded PDF content is not transmitted to the operator for the comparison itself. Details about logs, consent, and analytics are available on the Privacy page.
Can the tool reliably detect text changes?
When the PDF includes a usable text layer, text differences can be grouped and reviewed more clearly. With scanned or image-only PDFs, text changes must still be checked visually because the same text quality is not available for interpretation.
Which documents are most suitable?
The best fit is a pair of technically related versions with similar page structure, identical or very similar sheet size, and clear version history. Typical use cases include shop drawings, execution plans, coordinated plan packages, contractor revisions, and other revision-based document series.
When should I adjust the settings?
Start in standard mode whenever possible. Only move to more sensitive or more robust settings when a visible problem appears, for example too few findings, too much visual noise, or broad false positives caused by export differences.
What are the limits of the tool?
The tool does not replace semantic engineering review. It does not automatically understand the technical meaning of a change, apply project-specific approval rules, or issue legally binding decisions. Its value lies in making differences visible faster and easier to document.
Can I use the results in team discussions?
Yes. The exported view is helpful for internal coordination, contractor clarifications, approval meetings, and issue tracking. The important part is to keep page references, revision roles, and open questions explicit in the final output.