Supported File Formats

Microsoft Office formats

• Word: DOCX, DOC, DOCM, DOT, DOTX, DOTM, RTF
• Excel: XLSX, XLS, XLSM, XLSB, XLTM, XLT, XLTM, XLTX, XLAM, SXC, SpreadsheetML
• PowerPoint: PPT, PPTX, PPS, PPSX, PPSM, POT, POTM, POTX, PPTM

Images & Other Formats

• Portable: PDF
• Images: JPG, BMP, PNG, TIFF, GIF, DICOM, WEBP
• Other office formats: ODT, OTT, OTS, ODS, ODP, OTP, ODG

Other formats

• Web: HTML, MHTML
• Archives: ZIP, TAR, 7Z
• Certificates: PFX

GroupDocs.Signature for .NET Features

• Document signing - Add one or multiple supported types of signatures accurately at any specified position on business documents.
• Customize signatures - Utilize features such as color, font, border, rotation, etc., to configure the appearance of signatures.
• Document password protection - Secure certain document types by setting a password after signing.
• Protection from changes - Prevent changes to important business documents after appending a signature with a digital certificate.
• Convert signed files to other formats - Convert signed files to desired formats, such as saving a Word document as a PDF.
• Extract page previews - Extract pages from signed documents as individual images for future processing.
• Signature search in documents - Retrieve information about previously added signatures in specific documents.
• Validate signed documents - Verify the proper signing of documents using validation features.
• Update or delete signatures - Easily reposition specific signatures on a page, modify their text, or delete them without any issues.