YYSI PDF Crop — public verification fixtures, expected values
Published 2026-11-13. Fixtures are original synthetic files by YYSI;
reuse for testing is fine, provided as-is. Cropping is NOT redaction.

FIXTURE 1: cropbox-origin.pdf
  Page geometry: MediaBox (0, 0, 600, 800); existing CropBox (50, 100, 550, 700)
  -> visible region today: 500 x 600 pt

  crop with margins 0 pt on all four sides:
    expected CropBox after: (50, 100, 550, 700)  [UNCHANGED - zero margins keep
    the visible area; a tool that resets to the MediaBox 600x800 FAILS]
    expected visible size: 500 x 600 pt

  crop with margins 10 pt on all four sides:
    expected CropBox after: (60, 110, 540, 690)
    expected visible size: 480 x 580 pt

FIXTURE 2: multipage-rotation.pdf
  Page 1: 600 x 800, /Rotate 90, no CropBox
  Page 2: 500 x 600, /Rotate 180, existing CropBox (10, 10, 480, 580)
  Page 3: 400 x 400, /Rotate 270, no CropBox

  crop with margins 15 pt on all four sides, page range "2-3":
    page 1: untouched (outside range; no CropBox added)
    page 2: CropBox (25, 25, 450, 550); rotation preserved; visible 450 x 550 pt
    page 3: CropBox (15, 15, 370, 370); rotation preserved; visible 370 x 370 pt

NOTES
  * Crop boxes live in unrotated page space. 180 deg keeps width x height;
    90/270 deg swap them in the viewer.
  * Since 2026-11-13 YYSI's PDF Crop anchors cropping to the page's current
    visible frame (CropBox when present, else MediaBox) and preserves the box
    origin, so pre-cropped files and non-zero MediaBox origins behave exactly
    as a viewer would expect.
  * Plain A4 (no CropBox), 25.4 mm trimmed on every side -> crop box exactly
    (72.00, 72.00, 523.28, 769.89). Verified 2026-11-12; unchanged for
    CropBox-less pages by the 2026-11-13 fix.

METHOD (rerun it yourself)
  1. Open https://yysi.com/tools/pdf-crop/ and load a fixture.
  2. Enter the margins / range above, crop, download the result.
  3. Inspect with an independent PDF reader, e.g. PyMuPDF:
     python -c "import pymupdf; d = pymupdf.open('cropped.pdf'); print(d.xref_get_key(d[0].xref, 'CropBox'))"
  4. Compare with the expectations above.