Why do it
A copy with no recipient mention can be presented in another context. The watermark makes the destination visible. Sealing adds a certificate: if the file is changed, the proof no longer matches. The file is not kept.
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PMI Sceau, outil gratuit
Scellez votre document avant de l'envoyer
Pas un simple filigrane : la copie est scellée, comme un cachet de cire. Tampon visible, plus un certificat signé, revérifiable.
Aucun fichier n'est conservé, uniquement une empreinte.
When to do it
Before each time you send a copy to a third party.
- Rental file (agency, landlord)
- Bank, credit, insurance
- Employment, school, administrative procedure
- Any request received by email, SMS or online form
The seal does not stop a file from being copied. It makes the destination visible and any alteration detectable. If the document is already compromised, report it as well.
Déposez votre document ici
PDF, JPEG ou PNG, max 20 Mo
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PDF, JPEG ou PNG, max 20 Mo
Scellement
Filigrane visible + signature électronique
Téléchargement
PDF scellé prêt à transmettre
Aucun fichier n'est stocké côté serveur. Seule l'empreinte SHA-256 est conservée dans le registre PMI.
Outil gratuit, complémentaire à filigrane.numerique.gouv.fr
Frequently asked questions
What PMI Seal does, and what it does not
The questions most often asked by people sealing a document for the first time.
Is this just a watermark?
No. The watermark is the visible stamp. PMI Seal also seals the copy, like a wax stamp: it generates an electronically signed certificate, which attests recipient, purpose, date and file fingerprints. If the file is altered, the certificate breaks. A watermark alone, including a state-recommended one, does not provide that proof.
Do I need an account to seal a document?
No. Sealing works without an account. With an account, your seals remain available in your dashboard; without one, the certificate you download at the end is your only record: keep it alongside the document.
Do you keep the document I seal?
No. The file is processed in memory and never stored. Only two SHA-256 fingerprints, of the original and of the sealed document, and the certificate signature are kept.
Which file formats are accepted?
PDF, JPEG and PNG, up to 20 MB per document.
What is the certificate for, if the watermark is already visible?
The watermark is visible, like the impression of a stamp. It can be removed from a copy. The certificate is the wax: an electronic signature computed over the seal's facts, document fingerprints, document type, recipient, purpose and date. Altering any of them makes the certificate invalid.
Does the watermark stop someone from reusing my document?
No, not on its own. It makes the copy unusable as-is in another context, since it carries the recipient's name and the date, and it makes the source of a leak identifiable. It replaces neither the recipient organization's vigilance nor declaring the document if it is compromised.
What if I lose the certificate?
If the seal was created from an account, it remains available in your dashboard. If it was created without an account, the certificate cannot be recovered: PMI does not keep the document and cannot regenerate it. Sealing the document again produces a new certificate, dated today.