Reader support varies
Interactive forms, encryption methods, embedded content and advanced graphics can depend on the reader. If a recipient cannot open a file, ask which application and version they use and obtain the exact error rather than changing the extension.
Edits may change document structure
A library rewrite can create a structurally different file while preserving visible pages. Page copying may omit bookmarks, signatures or attachments. The Rebuild tool should therefore be checked as a new output, not assumed to preserve every source feature.
Test the actual requirement
Open the final output in the recipient’s reader and inspect every page. For archival or accessibility requirements, use a validator for the relevant standard. The PDF header version alone does not prove PDF/A, PDF/UA or print conformance.
Try the related tools
Further reading
Updated 2026-10-18. These are implementation notes and practical explanations, not a conformance certificate.