Direct answer. Choose a borderless paper from your printer's own media list, lay the photo out at its finished size, and print at 100% scale. Custom paper sizes created in Page Setup's Manage Custom Sizes normally cannot print borderless — the capability belongs to the driver's stocked sizes.

The 3-step method

  1. Pick a borderless paper from your printer's own media list. Borderless output only exists for papers the printer driver offers as borderless. In PrintExactly the page size menu matches the selected printer's real paper list, so a borderless stock shows up directly — no Manage Custom Sizes entry in Page Setup, which normally cannot print borderless.
  2. Lay out the photo at its finished size. Set the Photo Frame in millimeters, centimeters, or inches and place it on the borderless sheet. The layout uses that paper's exact reported dimensions, and the red dashed guide shows the printer-reported printable area for the sheet.
  3. Check the readouts, then print at 100% scale. Confirm effective DPI and that nothing important sits outside the printable area, then print at 100% scale from the macOS print panel. Driver settings still matter: keep the driver's borderless option on and the loaded paper matched to the chosen size.

Why borderless printing goes wrong on Mac

  • Custom paper sizes usually cannot print borderless. macOS Manage Custom Sizes creates a paper entry, but drivers only offer borderless printing for specific stocked sizes. If edge-to-edge output matters, pick the driver's own borderless paper instead of a custom size.
  • Borderless expansion can shift the printed size. Many drivers enlarge the image slightly (often 1–2%) so ink reaches the paper edge. That overprint area is meant to be trimmed or absorbed by the borderless stock. Print one test sheet and measure it if the dimension matters.
  • Loaded paper does not match the chosen size. Borderless selection in the dialog does not change what is in the tray. If the driver senses a mismatch it can fall back to bordered output or rescale. Load the borderless stock the layout expects.

Frequently asked questions

Why can't I print borderless with a custom paper size on Mac?

Because borderless printing is a driver capability tied to specific stocked sizes. Manage Custom Sizes in Page Setup creates a paper definition, but the driver only offers borderless output for the sizes it was designed for. Pick a borderless paper from the printer's own media list instead.

How do I find borderless papers for my printer on Mac?

They appear in the paper size menu with a borderless label once the printer's driver is installed. In PrintExactly the page size menu matches the selected printer's reported paper list, so borderless media is offered directly on the canvas instead of inside the print dialog.

Does borderless printing change the size of my photo?

It can. Many drivers expand the image slightly so ink covers the paper edge, which shifts the printed dimensions by a small amount. For jobs where the dimension matters, print a single test sheet first and measure it against a ruler.

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