Actual size vs fit to page: why scaling ruins zines and booklets

Every home printer has an area near the edges where it cannot print, typically 2.5 to 7.6 mm on each side. When you choose “Fit to page” (or “Shrink to fit”, “Scale to fit”, “Fit printable area”), the print dialog scales your whole page down until it fits inside that area and re-centres it. For an ordinary document that is harmless. For a zine or booklet it is fatal, because the fold lines are calculated for the full sheet: after scaling, the centre crease no longer lands between the panels.

The symptom is a sheet with an even white frame around everything and creases that cut through the edge of each panel instead of falling between them. On a booklet the gutter shifts and pages look off-centre after folding. Acrobat's default of centring pages with big white borders is the single most common complaint in zine printing forums.

The fastest way to know whether your dialog is scaling is to measure something. Foldpic's test page prints a 100 mm ruler horizontally and an 80 mm ruler vertically. Print it, put a real ruler against it, and if the printed 100 mm is 96 or 97 mm, scaling is on. Fix the print dialog and print it again until it measures exactly.

You only need to do this once per printer and computer. The setting is usually remembered, but a software update or a different app (a browser print dialog behaves differently from a PDF reader, for example) can quietly switch it back, so keep one test page in the drawer.

In Adobe Acrobat and Reader it is under Page Sizing and Handling: choose “Actual size”. In macOS Preview, in the print sheet choose “Scale: 100%” rather than “Scale to fit”. In Chrome and Edge the print dialog has “More settings” with a Scale option; set it to “Default” or 100 rather than “Fit to page”. Windows Photos and some phone apps default to fitting; if you print from a phone, use a PDF app that offers actual size.

Foldpic's instruction sheet repeats the setting in the print-settings card, and the PDF itself is sized to the exact paper you chose, so there is no reason for the dialog to scale. If your printer offers a “borderless” mode, note that it does the opposite of fit to page: it enlarges the image by a few percent to run off the edge. That is fine for full-bleed photos but also moves the fold lines, so only use it with formats that have no critical folds, such as single accordion panels you trim afterward.

A thin white border on the outer edge of a single-sided zine is normal even at 100 percent: it is the unprintable margin. The difference is that at actual size the border is only on the outer edges of the sheet and the folds are still in the right place. With scaling, the border is proportionally the same on all four sides and every fold is off. If the panels are the right size but the edges are white, your print is fine.