Extract text from SIGN files
To convert your SIGN file to another format, you need CryptoPro CSP or other System software.
To convert other file formats to the "Cryptographic Signature" file type, you need software like CryptoPro CSP or a similar tool.
A .SIGN file is primarily a digital signature created by security software like CryptoPro CSP or GnuPG. It uses cryptographic standards (PKCS#7, GOST, or OpenPGP) to verify the authenticity of a separate document. The critical limitation is that a .SIGN file is often a "detached" signature - it contains mathematical hashes, not the document text itself. Users frequently encounter these when dealing with government portals, tax submissions, or secure email, finding they cannot "open" them in Microsoft Word or Adobe Acrobat because the file contains no human-readable content. To access the data, users typically need specific middleware or the original file pair. If the file is an "enveloping" signature (common in some CryptoPro workflows), it effectively locks the document inside a proprietary container.
Best Conversion Targets: If the .SIGN file envelopes a document, the goal is extraction: convert to PDF, DOCX, or XML to view the actual content. For archiving or compatibility with international security tools, convert binary signatures to Base64 encoded ASC (Armored ASCII) or standard P7S formats.
Convert.Guru analyzes your SIGN file, detects the exact format, and lets you read the text inside.
Users also converted SIG, JPG, JPEG, ZIP, XMIND, PNG, FDCSS, SF, BISIGN, BLACK and PDF files.
If you want to convert SIGN file to PNG, JPG, BLACK or PDF, you can use CryptoPro CSP or similar software from the "Document Authentication" category. In the File menu, look for Save As… or Export….
To convert files to SIGN, try CryptoPro CSP or another comparable tool in the "Document Authentication" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our SIGN converter.