Aspect ratio: avoid stretching the design
Aspect ratio is the relationship between width and height. A 1080 × 1920 pixel image has a 9:16 ratio. At a width of 10 cm (about 3.94 inches), it will be about 17.78 cm (7 inches) tall without distortion.
The image size inside the PDF depends on the design’s proportions and the margins. One, two or four designs describes the A4 sheet layout, not a fixed invitation size. A4 is 210 × 297 mm, not US Letter.
Pixels, PPI and sharpness
PPI describes how many image pixels occupy one inch of paper. This calculator uses 300 PPI as a planning reference, without promising that an exported file has that resolution or a particular print quality.
Enlarging an image reduces its effective PPI. A PDF export does not turn a raster image into vector artwork or recover missing detail. Ask your printer for the required dimensions and resolution, and order a proof when appropriate.
Crop marks are not bleed
Crop marks indicate where to trim. Bleed is extra artwork beyond the trim edge; enabling crop marks does not create that extra artwork.
The editor’s PDF uses A4 and keeps the design’s proportions. If your printer needs bleed, CMYK or another page size, confirm those requirements before ordering. We do not assume every exported file meets a printer’s specifications.