Format profile / A3
A3
297 × 420 mm · 11.69 × 16.54 in
Width
297 mm
Height
420 mm
Area
1,247 cm²
Finished-size ledger
Pixel canvas by resolution
rounded to whole pixelsBleed and safe-area canvases
confirm with your printer3 mm on every edge
303 × 426 mm
Artwork canvas with bleed. Keep essential content inside roughly 291 × 414 mm if the same distance is also used as a simple safety margin.
5 mm on every edge
307 × 430 mm
Artwork canvas with bleed. Keep essential content inside roughly 287 × 410 mm if the same distance is also used as a simple safety margin.
Closest standard formats
both edges comparedWhere A3 fits
4 common usesNext in the ISO A drawer
larger / smallerSet up A3 artwork without guessing
Start the document at the finished size—297 × 420 mm—and add the bleed your printer specifies outside that edge. A common 3 mm bleed produces a 303 × 426 mm artwork canvas. Keep type, logos, folds, and other critical details inside the trim line; a safety margin is not the same thing as bleed.
Pixel dimensions only become meaningful when paired with a resolution. At 300 DPI, this format is 3,507 × 4,962 pixels. Changing that number in an export dialog without resampling does not add image detail—it only changes the declared physical scale.
A3 belongs to ISO A Series. Its proportion is 1:1.414 (√2); the √2 family is designed so a half-sheet keeps the same shape, which makes layouts easier to scale between related formats.