PDF Merge

Merges multiple PDF documents and images into a single PDF.#

Combines two or more PDF documents and/or images into a single merged PDF. Accepts PDF files and image formats (PNG, JPEG, TIFF, BMP, WEBP, GIF). Image sources are automatically converted to PDF pages before merging. Multi-page images (e.g. TIFF) produce one page per frame. Pages from all sources are concatenated in the order provided. The merged PDF is stored on the server and a file ID is returned. Use the file ID to download the result or pass it to other endpoints (document-to-markdown, pdf-search, pdf-layout) using the 'FileIdentifier' input format. This is a pure document processing operation that does not require an AI model. If processing exceeds the configured timeout, returns 202 Accepted with a job_id. Poll GET /lmkit/v1/jobs/ for status and results. Returns 422 Unprocessable Entity with an ErrorResponse body if the input file cannot be processed. The 'error' field contains one of: 'password_required' (encrypted PDF), 'invalid_format' (not a valid PDF), 'unsupported_security' (unsupported encryption), 'page_error' (content error).

Request body

application/json · PdfMergeRequest

Responses

curl -X POST "$LMKIT_ONE_URL/lmkit/v1/pdf-merge" \
  -H "Authorization: Bearer $LMKIT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "sources": [
    {
      "input": "",
      "input_format": "Base64EncodedFile"
    }
  ]
}'