Printer Calibration Ruler
Free print-calibration page — a ruler and a 50 mm test square to prove your printer prints at exact scale.
This is the page that makes printsheet.io trustworthy. It prints a ruler and a 50 mm × 50 mm square; measure them with a real ruler after printing. If the square measures exactly 50 mm, your printer and settings are honest and every other sheet will print at true scale.
If it's off, set Scale to 100% / Actual size and Margins to None in the print dialog and try again. Always calibrate before printing anything where exact size matters — sewing patterns, graph paper, game boards.
Printing at exact scale
Every sheet is drawn in real millimetres and prints at exact physical scale. For accurate output, set Scale = 100% (Actual size) and Margins = None in your browser's print dialog. Not sure your printer is honest? Run the printer ruler test first to confirm 50 mm really measures 50 mm. Prefer a file? Use the PDF, PNG or SVG buttons to download the sheet instead of printing — PDF and SVG keep the exact dimensions, and PNG is a 300 DPI image.
Frequently asked questions
Why do I need to calibrate?
Browsers and printers often 'shrink to fit', which quietly rescales your sheet. This page proves whether that's happening.
My square isn't 50 mm — what now?
Reprint with Scale = 100% (Actual size) and Margins = None. If it's still off, check for a printer-driver scaling option.
Is it really free?
Yes. Every template on printsheet.io is completely free, with no sign-up, no account and no watermark. Generate as many sheets as you like.
How do I get an exact-scale print?
Choose your paper size, then in the print dialog set Scale to 100% or “Actual size” and Margins to None. The sheet is defined in real millimetres, so it prints at true size. Use the calibration ruler page to verify.
Which paper sizes are supported?
A4, A5, A3, A6, US Letter, Legal and Tabloid, in portrait or landscape. Pick the size that matches the paper loaded in your printer.
Can I save it as a PDF instead of printing?
Yes — choose “Save as PDF” as the printer in your browser's print dialog. The PDF keeps the exact millimetre dimensions.
Can I download it as an image (PNG or SVG)?
Yes — as well as Print and PDF, every sheet has a PNG and an SVG download button. PNG gives you a high-resolution (300 DPI) image at the exact page size, ideal for pasting into a document or sharing. SVG is a scalable vector file that stays razor-sharp at any size and can be edited in tools like Inkscape or Illustrator. Both are generated in your browser from the sheet you see on screen.