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Print size reference

A3 size in pixels

A3 (297 × 420 mm) at every DPI (print, screen, and bleed variants) with one-click canvas setup in Polotno Studio. Free reference, no signup.

Quick answer

A3 at 300 DPI is 3508 × 4961 px (297 × 420 mm).

Formula: pixels = size in inches × DPI

Print size

297 × 420 mm

11.69 × 16.54 in

Pixels @ 300 DPI (print)

3508 × 4961 px

With 3 mm bleed: 3579 × 5031 px

Pixels @ 96 DPI (screen)

1123 × 1587 px

For previews and reading-only PDFs

Design in Studio →

A3 at every DPI

DPIPixelsWith 3 mm bleedUse for
72842 × 1191859 × 1208Legacy screen reference
961123 × 15871145 × 1610Screen, previews
1501754 × 24801789 × 2516Drafts, large format
3003508 × 49613579 × 5031Print standard
6007016 × 99217157 × 10063Fine offset, line art

Which DPI to pick

A3 (297 × 420 mm) is used for posters, menus, presentation boards, and fold-out brochures. For anything printed and read at arm’s length, build the canvas at 300 DPI. Screen-only documents can use 96 DPI. If the design has edge-to-edge color or images, use the bleed column and let the printer trim back to the final size, the bleed calculator covers the mechanics.

All paper sizes in pixels

SizeDimensionsPixels @ 300 DPI
A3297 × 420 mm3508 × 4961
A4210 × 297 mm2480 × 3508
A5148 × 210 mm1748 × 2480
A6105 × 148 mm1240 × 1748
US Letter8.5 × 11 in2550 × 3300
US Legal8.5 × 14 in2550 × 4200
Tabloid11 × 17 in3300 × 5100

Frequently asked questions

Q: What is A3 size in pixels at 300 DPI?

A3 (297 × 420 mm) at 300 DPI is 3508 × 4961 pixels. That's the canvas to use for print-quality output.

Q: What is A3 size in pixels for screens?

At 96 DPI (the common screen reference), A3 is 1123 × 1587 pixels. Fine for on-screen previews and PDFs meant for reading, blurry if sent to print.

Q: What size should my A3 canvas be with bleed?

With the standard 3 mm bleed on every edge, the A3 canvas at 300 DPI becomes 3579 × 5031 pixels. Use this when backgrounds run to the paper edge.

Q: How do I convert the size for a different DPI?

Multiply the size in inches by the DPI: pixels = inches × DPI. A3 is 11.69 × 16.54 in (297 × 420 mm), so any DPI target is one multiplication away, or read it from the table above.

Related tools

A4 size in pixels

A5 size in pixels

A6 size in pixels

DPI calculator

Bleed calculator

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