Who signed
The certificate, in plain fields
Signer name, organisation, country, the identifier in the certificate, who issued it, its serial number and its dates, plus the signing time the signer stated.
Free reader in your browser · English, Italiano, Română
See who signed a .p7m file, in your browser.
Drop a signed file. BIZSEAL reads the signature on your device, shows the signer and the certificate dates, checks that the signature matches the content, and hands you back the original document. Nothing is uploaded.
Signed file
- contratto.pdf.p7mOne signature layer, document insideRead
- SignerExample Signer, Example Org, ITCert
- Signature checkMatches the certificate in the fileMatch
- Originalcontratto.pdf, ready to downloadPDF
A .p7m file your computer will not open.
Contracts, invoices and court papers often arrive signed as .p7m or .p7s files, and no common operating system opens them. The usual fix is a website that asks you to upload the document. BIZSEAL reads it where it already is: on your device.
How it works
Four steps, all in your browser. The same file always gives the same reading.
- Open
Open the free reader on a computer or a phone.
- Drop
Drop the .p7m or .p7s file, or choose it from your files.
- Read
Signer, certificate dates, signature check and the file's SHA-256.
- Keep
Download the original document inside the signed file.
What a reading shows
One table per signature layer, the check against the content, and the original file.
Nothing uploaded
Your file stays on your device
The reader runs in your browser. The document is never sent anywhere, never stored, and the page works the same with the network switched off once it has loaded.
Signature check
Does the signature match the content?
BIZSEAL recomputes the signature against the certificate inside the file. A changed document or a changed signature shows as a mismatch. Files signed more than once (.p7m.p7m) show every signature the reader finds.
Signature layers
- Layer 1Example Signer, SHA-256, RSAMatch
- Layer 2Example Counter Signer, SHA-256, ECDSAMatch
- Detached .p7sChoose the original file to check itWaiting
Example only. A match means the signature fits the certificate in the file, nothing more.
What BIZSEAL will not do
Written down before the first customer, so nobody has to guess.
- The reader is free. A paid tier for many files at once is not live yet.
- It shows who signed. It does not confirm legal validity: the issuer, the trust list and revocation are not checked. For that, use the verifier of the certificate provider.
- PDF files signed inside the PDF (PAdES) open in a PDF reader; BIZSEAL reads .p7m and .p7s files. Encrypted .p7e files are not read.
- Nothing you drop leaves your browser. Not legal advice.
Questions, answered
No. BIZSEAL shows who signed and checks that the signature matches the certificate inside the file. It does not check the certificate against a national trust list or for revocation, so it does not confirm legal validity. The certificate provider's own verifier does that.
A .p7m file carries the document inside the signature. A .p7s file is the signature alone, sent beside the document; BIZSEAL asks you to choose that original file before it checks the signature.
Yes. The name usually means the file was signed more than once. The reader shows every signature it finds and gives you the original from the innermost envelope.
No. The reader runs in your browser and the file never leaves your device. Nothing is stored and there is no account.
Yes. The reader has Italian and Romanian pages with the same features, linked at the top of the reader.
The reader is free. A paid tier for reading many files at once, with a log for a matter file, is not live yet.
Open the file you were sent.
Drop a signed file into the free reader and see who signed it, in English, Italian or Romanian.
Free, no account, nothing uploaded. Domain: bizlegal-ai.com/signed-files.