Here is a list of all documented class members with links to the class documentation for each member:

- u -

• UID : iText.Signatures.CertificateInfo.X500Name
• UNABLE_TO_DESERIALIZE_JSON : iText.Commons.Logs.CommonsLogMessageConstant
• UNABLE_TO_RETRIEVE_IMAGE_WITH_GIVEN_BASE_URI : iText.StyledXmlParser.Logs.StyledXmlParserLogMessageConstant
• UNABLE_TO_RETRIEVE_IMAGE_WITH_GIVEN_DATA_URI : iText.StyledXmlParser.Logs.StyledXmlParserLogMessageConstant
• UNABLE_TO_RETRIEVE_RESOURCE_WITH_GIVEN_RESOURCE_SIZE_BYTE_LIMIT : iText.StyledXmlParser.Logs.StyledXmlParserLogMessageConstant
• UNABLE_TO_RETRIEVE_STREAM_WITH_GIVEN_BASE_URI : iText.StyledXmlParser.Logs.StyledXmlParserLogMessageConstant
• UNABLE_TO_SERIALIZE_OBJECT : iText.Commons.Logs.CommonsLogMessageConstant
• UNCOLORED : iText.Kernel.Pdf.Colorspace.PdfPattern.Tiling.PaintType
• UNCOMPRESSED_DATA_SIZE_IS_TOO_MUCH : iText.Commons.Logs.CommonsLogMessageConstant
• uncompressedMode : iText.IO.Codec.TIFFFaxDecompressor
• UNCONFIRMED_EVENT : iText.Kernel.Logs.KernelLogMessageConstant
• UNDEFINED : iText.IO.Font.Constants.FontStyles
• UNDEFINED_COMPRESSION : iText.Kernel.Pdf.CompressionConstants
• UNDEFINED_NAME : iText.StyledXmlParser.Css.CommonCssConstants
• UNDEFINED_TIMESTAMP_DATE : iText.Signatures.TimestampConstants
• UnderAgplITextProductEventProcessor() : iText.Commons.Actions.Processors.UnderAgplITextProductEventProcessor
• Underline() : iText.Layout.Properties.Underline
• UNDERLINE : iText.StyledXmlParser.Css.CommonCssConstants
• UnderlineTextMarkupAnnotationFlattener() : iText.Kernel.Utils.Annotationsflattening.UnderlineTextMarkupAnnotationFlattener
• UNENCRYPTED : iText.Kernel.Pdf.PdfObject
• UNICODE_BIDI : iText.StyledXmlParser.Css.CommonCssConstants
• UNICODE_BIG : iText.IO.Font.PdfEncodings
• UNICODE_BIG_UNMARKED : iText.IO.Font.PdfEncodings
• unicodeDifferences : iText.IO.Font.FontEncoding
• unicodeToCode : iText.IO.Font.FontEncoding
• UNIQUE_IDENTIFIER : iText.Signatures.CertificateInfo.X500Name
• UnitValue() : iText.Layout.Properties.UnitValue
• UNKNOWN_ABSOLUTE_METRIC_LENGTH_PARSED : iText.StyledXmlParser.Logs.StyledXmlParserLogMessageConstant
• UNKNOWN_PLACEHOLDER_WAS_IGNORED : iText.Commons.Logs.CommonsLogMessageConstant
• UNKNOWN_PRODUCT : iText.Commons.Exceptions.UnknownProductException
• UNKNOWN_PRODUCT_INVOLVED : iText.Kernel.Logs.KernelLogMessageConstant
• UNKNOWN_PROPERTY : iText.StyledXmlParser.Logs.StyledXmlParserLogMessageConstant
• UnknownContext() : iText.Commons.Actions.Contexts.UnknownContext
• UnknownProductException() : iText.Commons.Exceptions.UnknownProductException
• UnknownStatusBC() : iText.Bouncycastle.Cert.Ocsp.UnknownStatusBC
• UnknownStatusBC?() : iText.Bouncycastle.Cert.Ocsp.UnknownStatusBC
• UnknownStatusBCFips() : iText.Bouncycastlefips.Cert.Ocsp.UnknownStatusBCFips
• UnknownStatusBCFips?() : iText.Bouncycastlefips.Cert.Ocsp.UnknownStatusBCFips
• Unmarked : iText.Kernel.Pdf.Annot.PdfAnnotation
• UnpackValues() : iText.Layout.Hyphenation.HyphenationTree
• Unquote() : iText.StyledXmlParser.Css.Font.CssFontFace.CssFontFaceSrc
• Unread() : iText.Commons.Utils.PushbackReader
• Unregister() : iText.Commons.Actions.EventManager
• UnregisterContext() : iText.Commons.Actions.Contexts.AbstractContextManagerConfigurationEvent
• UNREPORTED_EVENT : iText.Commons.Logs.CommonsLogMessageConstant
• UNSAFE : iText.StyledXmlParser.Css.CommonCssConstants
• UnsafeFlushDeep() : iText.Kernel.Pdf.PageFlushingHelper
• UNSET : iText.StyledXmlParser.Css.CommonCssConstants
• UnsupportedEncodingException : iText.StyledXmlParser.Exceptions.StyledXMLParserException
• UPCA : iText.Barcodes.BarcodeEAN
• UPCE : iText.Barcodes.BarcodeEAN
• Update() : iText.Bouncycastle.Crypto.CipherBC , iText.Bouncycastle.Crypto.DigestBC , iText.Bouncycastle.Crypto.SignerBC , iText.Bouncycastlefips.Crypto.CipherBCFips , iText.Bouncycastlefips.Crypto.DigestBCFips , iText.Bouncycastlefips.Crypto.SignerBCFips , iText.Commons.Bouncycastle.Crypto.ICipher , iText.Commons.Bouncycastle.Crypto.ISigner , iText.Commons.Digest.IMessageDigest , iText.Kernel.Crypto.AESGCMCipher , iText.Kernel.Crypto.AesGcmDecryptor , iText.Signatures.PdfPKCS7
• UpdateCellIndexes() : iText.Layout.Element.Cell
• UpdateCheckedValue() : iText.Forms.FormDefaultAccessibilityProperties
• UpdateCtm() : iText.Kernel.Pdf.Canvas.CanvasGraphicsState , iText.Kernel.Pdf.Canvas.Parser.ParserGraphicsState
• UpdateCurrentArea() : iText.Layout.Renderer.CanvasRenderer
• UpdateDefaultAppearance() : iText.Forms.Fields.PdfFormField
• UpdateDefaultXmpMetadata() : iText.Kernel.Pdf.PdfDocument
• UpdateFromExtGState() : iText.Kernel.Pdf.Canvas.CanvasGraphicsState
• UpdateHeight() : iText.Layout.Renderer.AbstractRenderer
• UpdateLength() : iText.Kernel.Pdf.PdfStream
• UpdateMaxHeight() : iText.Layout.Renderer.AbstractRenderer
• UpdateMinHeight() : iText.Layout.Renderer.AbstractRenderer
• UpdateRawImageParameters() : iText.IO.Image.RawImageHelper
• UpdateSubsetPrefix() : iText.Kernel.Font.PdfFont
• UpdateUsedGlyphs() : iText.IO.Font.TrueTypeFont
• UpdateValueOfSavedProperty() : iText.Layout.Properties.ContinuousContainer
• UpdateVerifier() : iText.Bouncycastle.Crypto.SignerBC , iText.Bouncycastlefips.Crypto.SignerBCFips , iText.Commons.Bouncycastle.Crypto.ISigner
• UpdateWidth() : iText.Layout.Renderer.AbstractRenderer
• UpdateXmpMetadata() : iText.Kernel.Pdf.PdfDocument
• UPPER_ALPHA : iText.StyledXmlParser.Css.CommonCssConstants
• UPPER_LATIN : iText.StyledXmlParser.Css.CommonCssConstants
• UPPER_ROMAN : iText.StyledXmlParser.Css.CommonCssConstants
• UriResolver() : iText.StyledXmlParser.Resolver.Resource.UriResolver
• URL : iText.StyledXmlParser.Css.CommonCssConstants
• UrlFilter() : iText.StyledXmlParser.Resolver.Resource.DefaultResourceRetriever
• UrlGroup : iText.StyledXmlParser.Css.Font.CssFontFace.CssFontFaceSrc
• UrlPattern : iText.StyledXmlParser.Css.Font.CssFontFace.CssFontFaceSrc
• urls : iText.Signatures.CrlClientOnline
• USE : iText.Svg.SvgConstants.Tags
• USE_CANONICAL_FORMAT : iText.Kernel.XMP.Options.SerializeOptions
• USE_COMPACT_FORMAT : iText.Kernel.XMP.Options.SerializeOptions
• UseAllAvailableWidth() : iText.Layout.Element.Table
• UseAppendMode() : iText.Kernel.Pdf.StampingProperties
• UseAsPassword() : iText.Forms.Form.Element.InputField
• usedGlyphs : iText.Kernel.Font.PdfSimpleFont< T >
• UseMetaInfoDuringTheAction() : iText.Forms.Fields.FormsMetaInfoStaticContainer
• USER_SPACE_ON_USE : iText.Svg.SvgConstants.Values
• UseSmartMode() : iText.Kernel.Pdf.WriterProperties
• UUID_LENGTH : iText.Kernel.XMP.Impl.Utils
• UUID_SEGMENT_COUNT : iText.Kernel.XMP.Impl.Utils