Security

Local processing

Merge PDF and the page organizer tools run on the browser side. PDF.js uses a bundled local worker for page previews, and pdf-lib creates the result as a Blob download. PDFflow does not provide a backend document-processing service in this version.

Limits and unsupported files

Local processing depends on browser memory and device resources. The organizer currently limits one PDF to 50 MB and 200 pages. Encrypted or password-protected documents are not bypassed.

Complex PDF behavior

Creating a new PDF can affect digital signatures, document-level bookmarks, attachments and some interactive forms. Keep the original document and review important output files after processing.