> ## Documentation Index > Fetch the complete documentation index at: https://developer.pdf.co/llms.txt > Use this file to discover all available pages before exploring further. # PDF to PDF/A (API Tester) > Submit a PDF/A conversion and receive a background job ID. **Full reference:** [PDF to PDF/A](/api/pdf-to-pdfa) covers parameters, validation states, billing and limits. This operation starts a background job. Use [Background Job Check](/api/job-check) to retrieve the final files. ## OpenAPI ````yaml /openapi.json post /v1/pdf/convert/to/pdfa openapi: 3.0.1 info: title: PDF.co API description: '' version: '1.0' servers: - url: https://api.pdf.co security: - ApiKeyAuth: [] tags: - name: Extraction - name: Editing - name: PDF Conversion - name: Excel Conversion - name: PDF Merging & Splitting - name: Forms - name: Find & Search - name: Document, File & System - name: Pages - name: Barcodes paths: /v1/pdf/convert/to/pdfa: post: tags: - PDF Conversion summary: PDF to PDF/A description: >- Convert the complete PDF to PDF/A-3b and validate it with veraPDF. This endpoint is asynchronous only and has no async parameter. The submission response returns a jobId and planned file names, without output or report URLs. Poll /v1/job/check or use a callback for the final PDF, validation report and warnings. Completed non-compliant output is still charged; failed jobs refund the original processing debit once. See the full reference for validation states and limits. operationId: post_v1_pdf_convert_to_pdfa requestBody: required: true content: application/json: schema: type: object required: - url properties: url: allOf: - $ref: '#/components/schemas/url' default: >- https://pdfco-test-files.s3.us-west-2.amazonaws.com/document-parser/sample-invoice.pdf callback: type: string format: uri description: >- Callback URL notified when the background job finishes. Use it instead of polling. name: type: string description: >- Output PDF file name. If omitted, it derives from url when possible. expiration: type: integer default: 60 description: >- Minutes before temporary output and report URLs expire. The maximum also depends on the subscription plan and cannot exceed seven days. responses: '200': description: >- Background job accepted. File links are returned only in the final job result when those files are produced. content: application/json: schema: type: object properties: pageCount: type: integer description: >- Page count reported when the job is accepted; read the output count from the final job result. error: type: boolean description: False when the job was accepted. status: type: integer description: >- HTTP status code of the submission request, not the background job status. duration: type: integer description: >- Time to accept the request in milliseconds, excluding conversion and validation. name: type: string description: Planned converted PDF file name. validationReportName: type: string description: Planned validation report file name. jobId: type: string description: >- Background job identifier. Poll /v1/job/check or use a callback for the final result. credits: type: integer description: Credits charged for processing the first page only. remainingCredits: type: integer description: Credits remaining for the account. example: pageCount: 1 error: false status: 200 duration: 31 name: sample-invoice.pdf validationReportName: sample-invoice-pdfa-validation.json jobId: EXAMPLEJOBID0123456789ABCDEFGHIJ--166-400 credits: 25 remainingCredits: 400000 '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '402': $ref: '#/components/responses/NotEnoughCredits' '403': $ref: '#/components/responses/Forbidden' '404': $ref: '#/components/responses/NotFound' '408': $ref: '#/components/responses/Timeout' '429': $ref: '#/components/responses/TooManyRequests' '442': $ref: '#/components/responses/DamagedDocument' '452': $ref: '#/components/responses/InvalidUrl' '454': $ref: '#/components/responses/InvalidParameters' '500': $ref: '#/components/responses/InternalServerError' components: schemas: url: type: string format: uri description: >- URL to the source file [`url` attribute](/api/url-input-and-request-limits). responses: BadRequest: description: >- Bad request. Typically due to bad input parameters or unreachable input URLs (e.g., access restrictions like login or password). content: application/json: schema: type: object properties: error: type: boolean example: true status: type: integer example: 400 message: type: string example: >- Bad request. Typically due to bad input parameters or unreachable input URLs (e.g., access restrictions like login or password). Unauthorized: description: >- Unauthorized. Authentication is required and has failed or has not yet been provided. content: application/json: schema: type: object properties: error: type: boolean example: true status: type: integer example: 401 message: type: string example: >- Unauthorized. Authentication is required and has failed or has not yet been provided. NotEnoughCredits: description: Not enough credits. content: application/json: schema: type: object properties: error: type: boolean example: true status: type: integer example: 402 message: type: string example: Not enough credits. Forbidden: description: Access forbidden for input URL. content: application/json: schema: type: object properties: error: type: boolean example: true status: type: integer example: 403 message: type: string example: Access forbidden for input URL. NotFound: description: The requested resource could not be found. content: application/json: schema: type: object properties: error: type: boolean example: true status: type: integer example: 404 message: type: string example: The requested resource could not be found. Timeout: description: The server timed out waiting for the request. content: application/json: schema: type: object properties: error: type: boolean example: true status: type: integer example: 408 message: type: string example: The server timed out waiting for the request. TooManyRequests: description: Too many requests in a given time period. content: application/json: schema: type: object properties: error: type: boolean example: true status: type: integer example: 429 message: type: string example: Too many requests in a given time period. DamagedDocument: description: Input document is damaged or of incorrect type. content: application/json: schema: type: object properties: error: type: boolean example: true status: type: integer example: 442 message: type: string example: Input document is damaged or of incorrect type. InvalidUrl: description: Invalid URL. content: application/json: schema: type: object properties: error: type: boolean example: true status: type: integer example: 452 message: type: string example: Invalid URL. InvalidParameters: description: Invalid parameters. content: application/json: schema: type: object properties: error: type: boolean example: true status: type: integer example: 454 message: type: string example: Invalid parameters. InternalServerError: description: Something went wrong. Please try again or contact support. content: application/json: schema: type: object properties: error: type: boolean example: true status: type: integer example: 500 message: type: string example: Something went wrong. Please try again or contact support. securitySchemes: ApiKeyAuth: type: apiKey in: header name: x-api-key ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.