OpenP7M reads PDFs inside P7M files and supported FatturaPA XML locally in your browser. Free full watermarked preview; single-file export €1.99. Batches require an account and support up to 50 files / 100 MB per batch. It supports five nested layers and FPR12/FPA12 invoices with one body and no attachments. Local integrity checks do not validate certificate trust, revocation or legal signature validity.