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PDF, DOCX and OCR detection

The Document Reader converts supported files into readable text before analysis. It prefers fast native extraction and uses OCR for scanned or layout-heavy material.

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Extraction pipeline

  1. Validate

    The web route verifies type, size and access before forwarding the file.

  2. Extract natively

    PDF text layers, DOCX structure and plain text formats use native readers first.

  3. Apply OCR when needed

    Scans, images and complex layouts can use Docling to recover readable text.

  4. Return normalized text

    The detector receives plain text plus extraction metadata, not a visual imitation of the page.

Limits and access

  • Document upload is available from Plus.
  • The maximum upload size is 20 MB.
  • The extraction service returns up to 120,000 characters before the selected tool applies its own limit.
  • OCR jobs use short-lived in-memory state and expire after approximately 15 minutes.

Check extraction quality

Review the extracted text before interpreting a detection score. Missing columns, scrambled reading order or OCR substitutions change the linguistic structure available to the detector.