The service extracts and displays the contents of electronic signature files in SIG, P7S, and P7M formats in a convenient PDF report. You will see certificate information, including details about the owner and its validity period. If the signature is a container holding the original document, the tool allows you to extract and download it in a ZIP archive.
When this is useful
You received a signed contract via email as a .sig file and simply want to know who signed it and when, without installing complex cryptographic software. You upload the file and instantly get a clear report. In another case, you received a .p7m file and cannot open the original document — the service helps extract it from the signature container.
Step-by-step instructions
- Upload the file with a SIG, P7S, or P7M extension to the designated field on the page.
- Wait for the analysis to complete, which takes a few seconds.
- Download the generated PDF report containing the certificate data.
- If a P7M file was processed, you will additionally receive a download link for a ZIP archive containing the original document.
How to verify the result
Verify that all expected fields, such as the certificate owner's name and the validity start and end dates, are correctly displayed in the downloaded PDF report. If you extracted a document from a P7M file, open the ZIP archive and ensure the file inside is not corrupted and opens in the appropriate program. Note that the report only shows data from the file without verifying its authenticity.
Important limitations
This tool does not perform cryptographic verification of the signature's authenticity, does not check certificate trust chains, and does not consult revocation lists. It merely displays the information already contained within the uploaded file, so the data may be technically unreliable. The service does not support signature verification according to GOST standards but works with CMS/PKCS#7 formats.