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Use POST /api/v1/preview.

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What preview does

  • Always returns a PNG response as JSON (image_base64)
  • Applies a watermark
  • Scales output to 1200px width while keeping aspect ratio

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Notes

  • output_format must be "png" (use /generate for PDFs).
  • Preview is ideal for tuning margins, font sizing, and page selection before generating final output.
  • If you enable random effects (rotation/variation/indentation) or try less-tested fonts, run preview multiple times to confirm the layout remains within your safe area.