{
  "name": "PaperGrid browser PDF compression benchmark",
  "generatedAt": "2026-09-16T04:43:17.486Z",
  "browser": "HeadlessChrome/152.0.0.0",
  "method": {
    "balanced": { "renderScale": 1.35, "jpegQuality": 0.78 },
    "smaller": { "renderScale": 1, "jpegQuality": 0.58 },
    "lossless": { "description": "PDF structure rewrite with object streams" },
    "downloadRule": "PaperGrid downloads an output only when its byte size is smaller than the source."
  },
  "fixtures": {
    "imageHeavy": {
      "description": "Two synthetic image-heavy pages created from 1400x1900 canvases encoded at JPEG quality 0.98.",
      "source": { "bytes": 474438, "pages": 2 },
      "balanced": { "bytes": 56476, "pages": 2, "milliseconds": 119, "reductionPercent": 88.1, "wouldDownload": true },
      "smaller": { "bytes": 27778, "pages": 2, "milliseconds": 115, "reductionPercent": 94.1, "wouldDownload": true },
      "lossless": { "bytes": 474438, "pages": 2, "milliseconds": 1, "reductionPercent": 0, "wouldDownload": false }
    },
    "textFirst": {
      "description": "Three pages of selectable Helvetica text and vector rules saved with object streams.",
      "source": { "bytes": 3936, "pages": 3 },
      "balanced": { "bytes": 325073, "pages": 3, "milliseconds": 48, "reductionPercent": -8159, "wouldDownload": false },
      "smaller": { "bytes": 154411, "pages": 3, "milliseconds": 49, "reductionPercent": -3823, "wouldDownload": false },
      "lossless": { "bytes": 3936, "pages": 3, "milliseconds": 1, "reductionPercent": 0, "wouldDownload": false }
    },
    "mixed": {
      "description": "One selectable-text cover followed by the two image-heavy pages.",
      "source": { "bytes": 474846, "pages": 3 },
      "balanced": { "bytes": 73520, "pages": 3, "milliseconds": 131, "reductionPercent": 84.5, "wouldDownload": true },
      "smaller": { "bytes": 36783, "pages": 3, "milliseconds": 133, "reductionPercent": 92.3, "wouldDownload": true },
      "lossless": { "bytes": 474846, "pages": 3, "milliseconds": 1, "reductionPercent": 0, "wouldDownload": false }
    }
  },
  "limitations": [
    "Three deterministic synthetic fixtures, not a representative sample of all PDFs.",
    "Balanced and Smaller modes rasterize pages and remove selectable text and interactive PDF features.",
    "Negative reduction means the candidate output was larger and PaperGrid would refuse to download it as compressed.",
    "Timings depend on the browser, processor, memory and document complexity.",
    "No competitor products were tested or compared."
  ]
}