--- title: "enums" canonical_url: "https://www.nutrient.io/api/csharp/enums/" md_url: "https://www.nutrient.io/api/csharp/enums.md" last_updated: "2026-10-08T08:55:57.709Z" description: "Nutrient .NET SDK API reference for enums." --- Types grouped under `enums` in the API reference. Import them from the `Nutrient` namespace. ```csharp using Nutrient; ``` ## Enumerations | Enum | Description | | ----------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [`AutoTaggingEngine`](./auto-tagging-engine/) | Selects the engine used to build the logical structure (tags) when converting a document to a tagged, accessible PDF (PDF/UA). | | [`DescriptionLevel`](./description-level/) | Description detail levels for Vision document description. | | [`DocumentBookmarkSource`](./document-bookmark-source/) | Specifies the source for PDF document outline (bookmarks) when converting Office documents to PDF. | | [`DocumentFormat`](./document-format/) | Defines the format of the currently processed/used document. | | [`DocumentMarkupMode`](./document-markup-mode/) | Specifies the modes for converting document markups, including how changes and comments are rendered. | | [`DocumentType`](./document-type/) | The type of the document currently used. | | [`ExecutionProvider`](./execution-provider/) | Execution provider used to run Vision ONNX model inference. | | [`FormVlmEnrichmentModel`](./form-vlm-enrichment-model/) | Which model family enriches detected form fields, and therefore which flow runs. Explicit rather than inferred from the configured provider, so a self-hosted "Custom" endpoint that happens to run a general-purpose model isn't mistaken for the dedicated form-field model. | | [`HtmlLayoutType`](./html-layout-type/) | Specifies the desired layout type during a document conversion to HTML. | | [`ImageExportFormat`](./image-export-format/) | Specifies the export format for images. | | [`ImageExportMode`](./image-export-mode/) | Specifies how images are handled during document export to markup formats (Markdown, HTML). | | [`ImageSettingMode`](./image-setting-mode/) | Specifies the mode options for image settings. | | [`ImplicitConversion`](./implicit-conversion/) | Specifies the conversion behavior when a document format is not compatible with the editor. | | [`InlineStyleReferenceMode`](./inline-style-reference-mode/) | Reference strategy used when classifying inline text styles on OCR words. | | [`InstantJsonRenderTheme`](./instant-json-render-theme/) | Specifies the annotation appearance theme used when importing Instant JSON. | | [`JsonExportContent`](./json-export-content/) | Specifies which content elements to include in JSON export. | | [`JsonExportFormat`](./json-export-format/) | Specifies formatting options for JSON export. | | [`OcrActivationMode`](./ocr-activation-mode/) | Controls whether OCR resource loading and OCR-based word detection run inside the ICR image pipeline. | | [`OcrEngine`](./ocr-engine/) | Specifies which OCR engines read a page in document-processing pipelines. | | [`OpenSettingsMode`](./open-settings-mode/) | Defines the operational modes for opening documents. | | [`PageCacheMode`](./page-cache-mode/) | Defines the cache mode for the page. | | [`PaperNormalizationMode`](./paper-normalization-mode/) | Controls whether the page image handed to OCR is first expressed relative to its local paper level, which lets the recognizer read tinted, faint, or unevenly lit scans. | | [`PdfBorderStyle`](./pdf-border-style/) | Specifies the border style for annotations. | | [`PdfCompression`](./pdf-compression/) | Specifies the standard scheme to be used to compress image data in PDF documents. | | [`PdfConformance`](./pdf-conformance/) | Specifies PDF versions and conformance levels of a PDF document. The PDF versions correspond to the PDF major releases, starting from PDF 1.0. In each PDF version the new features have been introduced. The different conformance levels reflect the quality of the archived document and depend on the input material and the documents purpose. PDF/A versions and levels are given one after another. PDF/A-1 is the first archiving standard based on PDF version 1.4. All resources must be embedded within the PDF/A document itself. PDF/A-2 is based on PDF 1.7. It allows JPEG2000 compression, transparent elements, PDF layers and more. PDF/A-3 is available since October 2012. It allows to embed any file format desired. Level a (accessible) meets all requirements for the standard. Level b (basic) guaranteed that the content of the document can be unambiguously reproduced. Level u (unicode) specifies that all text can be mapped to standard Unicode character codes. | | [`PdfFormFieldType`](./pdf-form-field-type/) | Specifies the type of a PDF form field. | | [`PdfLineEndingStyle`](./pdf-line-ending-style/) | Specifies the style of line endings for line annotations. | | [`PdfPageSizes`](./pdf-page-sizes/) | Specifies page sizes. | | [`PdfRubberStampIcon`](./pdf-rubber-stamp-icon/) | Specifies the predefined icon for a rubber stamp annotation. | | [`PdfSavePreferences`](./pdf-save-preferences/) | Specifies preferences for saving PDF documents. | | [`PdfSettingsMode`](./pdf-settings-mode/) | Specifies the mode options for PDF settings. | | [`PdfValidationConformance`](./pdf-validation-conformance/) | Specifies the conformance level a PDF document is validated against. | | [`RenderingLayoutMode`](./rendering-layout-mode/) | Specifies how CAD content is laid out for rendering. | | [`RestorationMode`](./restoration-mode/) | Controls optional restoration of the page image before vision inference. | | [`SchemaCompatibility`](./schema-compatibility/) | Target dialect for a generated JSON Schema. Structured-output modes of the major LLM providers each accept a different subset of JSON Schema; the selected value acts as a preset filter applied on top of the individual `SchemaGenerationSettings` knobs — the effective rule is the stricter of the knob and the dialect limit, and features the dialect rejects are never emitted regardless of the knobs. | | [`SearchDisplay`](./search-display/) | How a text-search result is rendered. The matches are the same across all of these — only the presentation differs. | | [`SearchMode`](./search-mode/) | How aggressively a text search filters weak matches. The mode resolves to a BM-25 relevance floor: hits below it are dropped, so the caller gets a real answer or nothing. | | [`SignatureCertificationLevel`](./signature-certification-level/) | Specifies the certification (DocMDP) level of a signature. A certifying signature must be the first signature applied to a document and declares which subsequent changes are permitted. | | [`SignatureFormat`](./signature-format/) | Specifies the container format of a digital signature. | | [`SignatureHashAlgorithm`](./signature-hash-algorithm/) | Specifies the hash algorithm to use when creating a digital signature. | | [`SignatureKeySource`](./signature-key-source/) | Specifies where the signing key and certificate come from. | | [`SignatureLevel`](./signature-level/) | Specifies the PAdES baseline level to produce when applying a digital signature. | | [`TextDirection`](./text-direction/) | Text direction modes for reading order computation. | | [`TiffCompression`](./tiff-compression/) | Specifies the TIFF compression when saving images in TIFF format. | | [`UnitMode`](./unit-mode/) | Specifies different unit modes. | | [`UnparseableOutputHandling`](./unparseable-output-handling/) | How AI extraction responds when the model's output never parses against the requested schema (all retry attempts exhausted). | | [`VisionEngine`](./vision-engine/) | Specifies which vision processing pipeline to use for content extraction. | | [`VisionFeatures`](./vision-features/) | Vision processing features that can be enabled or disabled. | | [`VisionOutputFormat`](./vision-output-format/) | Format of content returned by `ExtractContent` and `ExtractContentToFile`. | | [`VlmClassificationStrategy`](./vlm-classification-strategy/) | Strategy for how zones are sent to the VLM for classification. | | [`VlmProvider`](./vlm-provider/) | Available Vision Language Model providers. | | [`WordRefiningMethod`](./word-refining-method/) | Method used to refine handwritten word text when AI-augmented text is available. | --- ## Related pages - [Auto Tagging Engine](/api/csharp/enums/auto-tagging-engine.md) - [Description Level](/api/csharp/enums/description-level.md) - [Document Bookmark Source](/api/csharp/enums/document-bookmark-source.md) - [Document Format](/api/csharp/enums/document-format.md) - [Document Markup Mode](/api/csharp/enums/document-markup-mode.md) - [Document Type](/api/csharp/enums/document-type.md) - [Execution Provider](/api/csharp/enums/execution-provider.md) - [Form Vlm Enrichment Model](/api/csharp/enums/form-vlm-enrichment-model.md) - [Html Layout Type](/api/csharp/enums/html-layout-type.md) - [Image Export Format](/api/csharp/enums/image-export-format.md) - [Image Export Mode](/api/csharp/enums/image-export-mode.md) - [Image Setting Mode](/api/csharp/enums/image-setting-mode.md) - [Implicit Conversion](/api/csharp/enums/implicit-conversion.md) - [Inline Style Reference Mode](/api/csharp/enums/inline-style-reference-mode.md) - [Instant Json Render Theme](/api/csharp/enums/instant-json-render-theme.md) - [Json Export Content](/api/csharp/enums/json-export-content.md) - [Json Export Format](/api/csharp/enums/json-export-format.md) - [Ocr Activation Mode](/api/csharp/enums/ocr-activation-mode.md) - [Ocr Engine](/api/csharp/enums/ocr-engine.md) - [Open Settings Mode](/api/csharp/enums/open-settings-mode.md) - [Page Cache Mode](/api/csharp/enums/page-cache-mode.md) - [Paper Normalization Mode](/api/csharp/enums/paper-normalization-mode.md) - [Pdf Border Style](/api/csharp/enums/pdf-border-style.md) - [Pdf Compression](/api/csharp/enums/pdf-compression.md) - [Pdf Conformance](/api/csharp/enums/pdf-conformance.md) - [Pdf Form Field Type](/api/csharp/enums/pdf-form-field-type.md) - [Pdf Line Ending Style](/api/csharp/enums/pdf-line-ending-style.md) - [Pdf Page Sizes](/api/csharp/enums/pdf-page-sizes.md) - [Pdf Rubber Stamp Icon](/api/csharp/enums/pdf-rubber-stamp-icon.md) - [Pdf Save Preferences](/api/csharp/enums/pdf-save-preferences.md) - [Pdf Settings Mode](/api/csharp/enums/pdf-settings-mode.md) - [Pdf Validation Conformance](/api/csharp/enums/pdf-validation-conformance.md) - [Rendering Layout Mode](/api/csharp/enums/rendering-layout-mode.md) - [Restoration Mode](/api/csharp/enums/restoration-mode.md) - [Schema Compatibility](/api/csharp/enums/schema-compatibility.md) - [Search Display](/api/csharp/enums/search-display.md) - [Search Mode](/api/csharp/enums/search-mode.md) - [Signature Certification Level](/api/csharp/enums/signature-certification-level.md) - [Signature Format](/api/csharp/enums/signature-format.md) - [Signature Hash Algorithm](/api/csharp/enums/signature-hash-algorithm.md) - [Signature Key Source](/api/csharp/enums/signature-key-source.md) - [Signature Level](/api/csharp/enums/signature-level.md) - [Text Direction](/api/csharp/enums/text-direction.md) - [Tiff Compression](/api/csharp/enums/tiff-compression.md) - [Unit Mode](/api/csharp/enums/unit-mode.md) - [Unparseable Output Handling](/api/csharp/enums/unparseable-output-handling.md) - [Vision Engine](/api/csharp/enums/vision-engine.md) - [Vision Features](/api/csharp/enums/vision-features.md) - [Vision Output Format](/api/csharp/enums/vision-output-format.md) - [Vlm Classification Strategy](/api/csharp/enums/vlm-classification-strategy.md) - [Vlm Provider](/api/csharp/enums/vlm-provider.md) - [Word Refining Method](/api/csharp/enums/word-refining-method.md)