Print comes out and the content is a small block in the top-left corner of a big sheet of paper. Lots of white space, tiny content.
What's actually going wrong
The PDF's internal page size is smaller than the paper. Print drivers default to 'actual size' rather than 'fit to page', leaving the content at its native small dimensions on a large sheet.
Common with mobile screenshots (375pt wide), receipts (80mm wide), or PDFs exported with custom page sizes.
The quick fix
In your print dialog, find 'Page Sizing' or 'Scale'. Set to Fit or Fit to printable area. Print again. The content scales up to fill the page.
For a permanent fix, rebuild the PDF at standard page size. Convert to Word, set page to A4 or Letter in Word, convert back to PDF. Future prints work at full size by default.
If that didn't work
If 'fit to page' still prints small, the content within the PDF is small — the file has correct A4 pages with tiny content positioned in the corner. Crop and scale via image conversion: PDF to JPG, crop in image tool, back to PDF.
For receipts and similar small-format documents, set the print paper to the smaller format too (custom size A6 or similar) so content prints proportionally.
Prevent it next time
Set standard page sizes (A4, Letter) at source. Don't export at custom small sizes unless you specifically need them. And for documents that'll be printed on full sheets, design at the print size from the start.
FAQ
What's 'fit to page' actually doing?
Scaling content proportionally so the longer dimension fills the paper. It's a print-time scaling that doesn't change the file.
Why does the same PDF print full-size in one app and tiny in another?
Different print dialog defaults. Some apps default to fit, some to actual size. Verify the scale setting before each print.
Can I make the PDF print full-size by default?
Yes, by rebuilding at standard page size via Word round-trip. The new file has matching page dimensions and prints full-size everywhere.
Will fit-to-page reduce quality?
Scaling up a small page enlarges every pixel, so resolution drops proportionally. For text it's usually fine; for detailed images expect some softness.
Tiny prints fix in Flint with a rebuild — or use 'fit to page' as a quick workaround.