A1 size in pixels
A1 is 594 × 841 mm. In pixels that is 7016 × 9933 at 300 DPI for print and 1684 × 2384 at 72 DPI.
A1 is half of A0, a common size for posters, plans and flip charts. It measures 594 × 841 mm, or 23.39 × 33.11 in, with sides in the ratio 1 to √2 so that it halves into the next size down.
| Resolution | Pixels (portrait) | With 3 mm bleed | Megapixels | Uncompressed |
|---|---|---|---|---|
| 72 DPI | 1684 × 2384 | 1701 × 2401 | 4 | 11 MB |
| 96 DPI | 2245 × 3179 | 2268 × 3201 | 7.1 | 20 MB |
| 100 DPI | 2339 × 3311 | 2362 × 3335 | 7.7 | 22 MB |
| 150 DPI | 3508 × 4967 | 3543 × 5002 | 17 | 50 MB |
| 200 DPI | 4677 × 6622 | 4724 × 6669 | 31 | 89 MB |
| 240 DPI | 5613 × 7946 | 5669 × 8003 | 45 | 128 MB |
| 300 DPI | 7016 × 9933 | 7087 × 10004 | 70 | 199 MB |
| 400 DPI | 9354 × 13244 | 9449 × 13339 | 124 | 354 MB |
| 600 DPI | 14031 × 19866 | 14173 × 20008 | 279 | 797 MB |
| 1200 DPI | 28063 × 39732 | 28346 × 40016 | 1,115 | 3.12 GB |
Landscape is the same numbers the other way round. Pixels are rounded to the nearest whole pixel. The last column is 8-bit RGB before compression.
Which resolution to use for A1
For print that will be held and read, use 300 DPI: 7016 × 9933 pixels, 70 megapixels. A sheet this large is usually seen from further back, so 150 DPI (3508 × 4967 pixels) is often enough and a quarter of the file. For a screen, the DPI number does nothing; only the pixel size matters.
Will a photo fill it?
- A 12 megapixel phone photo (4000 × 3000 pixels), cropped to fill A1, prints at 121 DPI: visibly soft unless seen from across a room.
- A 24 megapixel camera photo (6000 × 4000 pixels), cropped to fill A1, prints at 171 DPI: fine from a step back, a little soft up close.
- A 48 megapixel photo (8000 × 6000 pixels), cropped to fill A1, prints at 242 DPI: fine from a step back, a little soft up close.