Every printable on this site exports in two sizes: US Letter and A4. They look almost identical on screen, they are close enough to be confused, and they are different enough to quietly wreck a ruled page if you print the wrong one with the wrong settings. Here is what actually matters.
The two standards
US Letter is 8.5 × 11 inches (215.9 × 279.4 mm). A4 is 210 × 297 mm (about 8.27 × 11.69 inches). Put one on top of the other and the difference is plain: Letter is about 6 mm wider, A4 is about 18 mm taller. Neither fits inside the other, which is exactly why printers and PDF viewers keep offering to "help" by rescaling.
Who uses which is mostly geography. Letter is the standard in the United States, Canada, Mexico, and parts of Latin America. A4 — part of the international ISO 216 series — is the standard essentially everywhere else: Europe, Ukraine, the UK, Asia, Africa, Australia. The practical rule is boring and reliable: pick the size that matches the paper already sitting in your printer tray. Every generator here, from lined paper to planners, lets you choose Letter or A4 before you download, so the PDF is born at the right size instead of being squeezed into it later.
Why "fit to page" ruins ruled spacing
This is the single most common reason a printable "comes out wrong". When your PDF viewer's print dialog is set to "Fit to page", "Shrink to fit", or "Fit printable area", it rescales the whole document to squeeze it inside the printer's printable region — typically shrinking everything by 3–6%, and more if the paper size doesn't match the PDF.
For a poster, nobody notices. For ruled paper, everything is calibrated. A narrow-ruled page uses 0.28-inch line spacing; shrink it 5% and you get roughly 0.266-inch lines — cramped enough that adult handwriting no longer fits comfortably, and every page you print later at a different scale won't match the ones in your binder. Grid squares stop being square-inch-accurate, handwriting guide rows shrink under a child's letters, planner boxes get subtly meaner.
The fix takes two seconds: in the print dialog, set the scale to "Actual size" or 100% (in some viewers, "Custom scale: 100"). Do that, make sure the PDF size matches the paper in the tray, and the lines print at exactly the spacing you chose in the generator.
Margins and the non-printable edge
Almost no home printer can print to the very edge of the sheet. Most inkjets and lasers leave an unprintable border of roughly 4–6 mm (about 0.2 inches), often a little more at the bottom where the paper leaves the rollers. This is why printing at 100% is safe here: the generators keep their content inside a margin, so nothing you need gets clipped.
When you pick a margin setting, you are really deciding two things:
- Compact squeezes in the most writing space — good for scratch notes and drafts, but leaves no room for a hole punch.
- Standard is the safe default for anything going into a folder or getting stapled.
- Roomy leaves comfortable space for binder rings, teacher comments, or thumb room in a planner.
If pages are going into a ring binder, err on the roomier side — a hole punch takes about 12 mm off one edge, and it always takes it from the side you wrote on.
Line spacing, decoded
Ruled paper spacing sounds arbitrary until you map it to the notebooks everyone already knows:
- Narrow — 0.28 in (about 7.1 mm): essentially college ruled. Dense, efficient, best for adult handwriting and note-heavy pages.
- Regular — 0.36 in (about 9 mm): a comfortable middle ground, close to many European exercise books. A good everyday default.
- Wide — 0.48 in (about 12 mm): wide ruled territory. Right for kids, large handwriting, or pages meant to be annotated between the lines.
The same logic applies to grid paper: a smaller grid suits engineering sketches and tiny handwriting, a larger one suits kids' math practice, where digits need room to breathe.
Paper weight: planners vs worksheets
The paper you load matters as much as the layout. Standard copy paper is 20 lb (about 80 gsm) — perfectly fine for math worksheets, handwriting sheets, and anything used once and recycled. For planners, habit trackers, and dot grid pages destined for a journal, step up to 24–28 lb (90–105 gsm) or more. Heavier stock resists show-through when you write on both sides, survives gel pens and markers without bleeding, and holds up to weeks of page-flipping. A cheap upgrade with an outsized effect: the same free PDF feels like stationery instead of a photocopy.
The thirty-second checklist
- Generate the PDF in the size that matches your paper — Letter or A4.
- In the print dialog, set scale to "Actual size" / 100%.
- Check the paper size selected in the dialog matches the tray.
- Print one test page and lay a ruler on the lines before printing the whole stack.
Do that once, and every page you print afterward will match — same spacing, same margins, same feel, whichever side of the Atlantic your paper comes from.