Guide · Verification · Received PDF
A signature mark on a page is easy to copy. What counts is the electronic signature inside the file. CEI One checks it on iPhone or Mac, without an ID card, and tells you in plain words what it found.
Step by step
Save the PDF exactly as you received it, for example from Mail to Files. Do not print it to PDF or re-save it from an editor: a new copy can lose the signature or show up as modified.
On iPhone, open verification in CEI One and choose the file from Files. On Mac, in Analyze PDF, drag the file into the window or choose it from disk. You do not need the card, but you need internet access for a full revocation check.
For each signature you see whether the document is unchanged, whether the signature is cryptographically correct, who signed and with which certificate, the trust chain, the signing time from the timestamp and the revocation status.
The report shows the document's revisions and whether changes or annotations were added after the last signature. A PDF signed by two parties has two signatures, each with its own result.
If the document shows as modified or the signature does not validate, ask the sender for the original file. For eID-signed documents, you can get a second check from the MAI service “Verificare document semnat cu CEI” on HUB.
Good to know
A valid signature shows that the file did not change after signing and who signed it, according to the certificate. It does not confirm that the person was entitled to sign or that the text is right. Those are for you to judge.
The app recognizes the MAI root for eID certificates and the certSIGN root, plus the certificates Apple's system trusts. Qualified status is shown from the certificate's own statement, without a check against the EU Trusted List.
A check you start downloads revocation lists from the issuers. Library documents are checked automatically on the device, offline, using only the document's own data; “Verify again” gives you the full check.
The analysis only reads the PDF. You can keep the document with its result in the app's history, or export the result as a PDF report with Export report.
Straight answers
No. Verification does not use the card, the CAN or the PINs.
Yes, if it is a compatible PDF signature. The trust result depends on the issuer: the app recognizes MAI, certSIGN and the certificates Apple's system trusts.
That further changes were written to the file after the signature. Sometimes they are legitimate, for example a second signature. The report shows what was added after each signature.
To find out whether the signer's certificate was revoked. The app downloads revocation lists from the addresses in the certificates.
The MAI service checks eID-signed documents you upload to HUB. CEI One checks the PDF on your phone or Mac and explains each signature, without uploading the document anywhere.
Sources
Portal requirements are as published on the pages below (in Romanian), checked on 18 October 2026. They can change: read the service's page before you send a document. This guide is not legal advice.
CEI One for iPhone and Mac
No account and no CEI One servers: your documents, CAN and PINs stay with you.