.NET Digital Signature Library
Electronically Sign Documents from a wide range of file formats. Supports several types of e-signing methods.
e-Sign Documents in .NET Apps
- Create and add signatures to documents of various file formats.
- Specify visual attributes of signatures, such as color, font, margins, etc.
- Search and fetch a list of signatures from a document.
- Determine if the document contains signatures meeting specified criteria.
- Extract basic information about the document.
- Generate image representation of document pages for preview.
- Distinguish created signatures from the actual document.
- Put encrypted text into the QR-code signature or embed custom data objects.
New Features & Enhancements v20.11
- Implemented the additional customization of
PDF
Digital Signature appearance.
- Improved the save feature of Open Office documents with the
OTT
file format.
- Implemented support of Native Text Signature implementation on the Image documents.
- The Class
PdfDigitalSignature
has been updated as the Authority
property has been removed.
Please visit GroupDocs.Signature for .NET 20.11 Release Notes for the detailed notes.
The following section lists the supported file formats for the barcode, image, QR-code, stamp, and text signature types:
Microsoft Word: DOC, DOCM, DOCX, DOT, DOTM, DOTX
Microsoft Excel: XLSX, XLS, XLSB, XLSM, XLTX, XLTM
Microsoft PowerPoint: PPTX, PPTM, PPT, PPSX, PPSM, PPS, POTX, POTM
OpenOffice: ODT, OTT, ODS, OTS, ODP, OTP
Image: BMP, GIF, JPG, JPEG, PNG, SVG, TIF, TIFF, WEBP
CorelDraw: CDR, CMX
Photoshop: PSD
Metafile: WMF
Portable: PDF
Microsoft Word: DOC, DOCM, DOCX, DOT, DOTM, DOTX
Microsoft Excel: XLSX, XLS, XLSB, XLSM, XLTX, XLTM
OpenOffice: ODS, OTS
Portable: PDF
Microsoft Word: DOC, DOCM, DOCX, DOT, DOTM, DOTX
Microsoft Excel: XLSX, XLS, XLSB, XLSM, XLTX, XLTM
OpenOffice: ODS, OTS, ODP
Portable: PDF
Microsoft Word: DOC, DOCM, DOCX, DOT, DOTM, DOTX
Microsoft Excel: XLSX, XLS, XLSB, XLSM, XLTX, XLTM
Microsoft PowerPoint: PPTX, PPTM, PPT, PPSX, PPSM, PPS, POTX, POTM
OpenOffice: ODT, OTT, ODS, OTS, ODP, OTP
Image: JPG, JPEG, PNG, SVG, TIF, TIFF
Photoshop: PSD
Portable: PDF
Supported Signature Types
- Text stamps
- Text labels
- Text as an image signature
- Image signature
- Digital signature
- Barcode signature
- QR-code signature
- Metadata signature
- Form-field signature
GroupDocs.Signature for .NET does not require any external software or third party tool to be installed. GroupDocs.Signature for .NET supports any 32-bit or 64-bit operating system where .NET or Mono framework is installed. The other details are as follows:
Microsoft Windows: Microsoft Windows Desktop (x86, x64) (XP & up), Microsoft Windows Server (x86, x64) (2000 & up), Windows Azure
macOS: Mac OS X
Linux: Linux (Ubuntu, OpenSUSE, CentOS and others)
Development Environments: Microsoft Visual Studio (2010 & up), Xamarin.Android, Xamarin.IOS, Xamarin.Mac, MonoDevelop 2.4 and later.
Supported Frameworks: GroupDocs.Conversion for .NET supports .NET and Mono frameworks.
using (Signature signature = new Signature("sample.pdf"))
{
// create QRCode option with predefined QRCode text
QRCodeSignOptions signOptions = new QRCodeSignOptions("JohnSmith")
{
EncodeType = QRCodeTypes.QR,
Left = 100,
Top = 100
};
PdfSaveOptions pdfSaveOptions = new PdfSaveOptions()
{
FileFormat = PdfSaveFileFormat.DocX,
OverwriteExistingFiles = true
};
// sign document to file
signature.Sign("SignedPdf.docx", signOptions, pdfSaveOptions);
}
Use C# to Search and Delete Signatures from DOCX File
// initialize Signature instance
using (Signature signature = new Signature("signed.docx"))
{
BarcodeSearchOptions options = new BarcodeSearchOptions();
List<BarcodeSignature> signatures = signature.Search<BarcodeSignature>(options);
List<BaseSignature> signaturesToDelete = new List<BaseSignature>();
// collect signatures to delete
foreach (BarcodeSignature temp in signatures)
{
if (temp.Text.Contains("John"))
{
signaturesToDelete.Add(temp);
}
}
// delete signatures
DeleteResult deleteResult = signature.Delete(signaturesToDelete);
if (deleteResult.Succeeded.Count == signaturesToDelete.Count)
{
Console.WriteLine("All signatures were successfully deleted!");
}
else
{
Console.WriteLine($"Successfully deleted signatures : {deleteResult.Succeeded.Count}");
Console.WriteLine($"Not deleted signatures : {deleteResult.Failed.Count}");
}
Console.WriteLine("List of deleted signatures:");
foreach (BaseSignature temp in deleteResult.Succeeded)
{
Console.WriteLine($"Signature# Id:{temp.SignatureId}, Location: {temp.Left}x{temp.Top}. Size: {temp.Width}x{temp.Height}");
}
}
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