> ## Documentation Index > Fetch the complete documentation index at: https://developers.lighton.ai/llms.txt > Use this file to discover all available pages before exploring further. # Render a document as PDF > Convert a document into a PDF suitable for inline preview. Accepts a **file upload** (multipart/form-data), a **document URL**, or a **file_id** referencing a document already ingested in the platform (JSON body). The conversion is synchronous — the PDF bytes are returned directly. **Supported file types:** `.pdf`, `.png`, `.jpg`, `.jpeg`, `.pptx`, `.ppt`, `.odp`, `.docx`, `.odt`, `.doc`, `.html`, `.xhtml` **Size limit:** 20 MB. ## OpenAPI ````yaml /api-reference/api-console.yaml post /api/v3/preview openapi: 3.1.0 info: title: LightOn API version: 3.12.0 (v1) description: >- LightOn gives you an API to search, parse, and ingest documents at scale. Build knowledge-retrieval pipelines without managing vector databases or OCR models. servers: - url: https://api.lighton.ai security: [] tags: - name: Ask description: >- Retrieval-augmented generation: search your indexed corpus and generate an LLM answer grounded in the retrieved passages. Supports streaming (SSE) and synchronous modes. - name: Search description: >- Hybrid vector + text retrieval over your indexed corpus. Returns ranked passages with provenance (file, page range, workspace). Optional reranking and vision mode. - name: Files description: Upload, list, fetch, and delete documents indexed in your workspaces. - name: Facets description: >- Organise documents with hierarchical content types and custom attributes per file. Start from starter templates or build your own classification schema from scratch. - name: Tags description: >- Manage flat, company-wide labels used to scope search and group content across workspaces. - name: Workspaces description: >- Create and manage workspaces — the access-controlled containers your documents live in. - name: Parse description: >- Convert documents into structured Markdown — PDFs, images, Office files, and HTML. Synchronous endpoint capped at 20 MB / 15 pages. - name: Extract description: >- Pull typed fields out of documents using a JSON Schema you provide. Sync mode for small documents (≤20 MB / 15 pages); async mode for larger jobs (≤100 MB / 1000 pages) with polling on a job ID. - name: API Keys description: >- Provision and revoke API keys used to authenticate against the Console API. - name: Budget description: >- Manage your organization's monthly spend budget and alert thresholds. Set a hard cap that blocks API requests when reached, and configure email notifications at custom spend percentages. paths: /api/v3/preview: post: tags: - Parse summary: Render a document as PDF description: >- Convert a document into a PDF suitable for inline preview. Accepts a **file upload** (multipart/form-data), a **document URL**, or a **file_id** referencing a document already ingested in the platform (JSON body). The conversion is synchronous — the PDF bytes are returned directly. **Supported file types:** `.pdf`, `.png`, `.jpg`, `.jpeg`, `.pptx`, `.ppt`, `.odp`, `.docx`, `.odt`, `.doc`, `.html`, `.xhtml` **Size limit:** 20 MB. operationId: api_v3_preview_create requestBody: content: multipart/form-data: schema: multipart/form-data: type: object properties: file: type: string format: binary description: The document to convert. application/json: type: object properties: document: type: string format: uri description: Publicly accessible URL of the document to convert. file_id: type: integer description: >- ID of a document already ingested in the platform. Mutually exclusive with `document`. examples: RenderAPDFViaFileUpload: value: file: (binary) summary: Render a PDF via file upload description: Upload a document file directly for synchronous PDF rendering. application/x-www-form-urlencoded: schema: multipart/form-data: type: object properties: file: type: string format: binary description: The document to convert. application/json: type: object properties: document: type: string format: uri description: Publicly accessible URL of the document to convert. file_id: type: integer description: >- ID of a document already ingested in the platform. Mutually exclusive with `document`. application/json: schema: multipart/form-data: type: object properties: file: type: string format: binary description: The document to convert. application/json: type: object properties: document: type: string format: uri description: Publicly accessible URL of the document to convert. file_id: type: integer description: >- ID of a document already ingested in the platform. Mutually exclusive with `document`. examples: RenderADocumentViaURL: value: document: https://example.com/report.docx summary: Render a document via URL description: Provide a publicly accessible document URL. RenderAnIngestedDocumentByID: value: file_id: 42 summary: Render an ingested document by ID description: Reference a document already ingested in the platform. responses: '200': description: PDF rendered successfully. Response body is the raw PDF bytes. '400': description: Bad request — missing document, unsupported format, or invalid URL. '401': description: Authentication credentials were not provided or are invalid. '413': description: File exceeds the 20 MB size limit. '422': description: Conversion failed — corrupt file or LibreOffice error. '429': description: >- Rate limit exceeded. Retry after the delay indicated in the Retry-After header. security: - bearerAuth: [] components: securitySchemes: bearerAuth: type: http scheme: bearer description: >- Bearer authentication header of the form `Bearer `, where `` is your auth token. ````