Open PDFs inside P7M files and supported FatturaPA XML in your browser. Document content stays on your device. Open a full watermarked preview for free; exporting one source file costs €1.99. Batches require an account (up to 50 files/100 MB). Files up to 50 MB and five nested P7M layers are supported. Local integrity checks do not validate certificate trust, revocation or legal signature validity. FPR12/FPA12 invoice XML must contain one body and no embedded attachments.