A4 at 300 DPI in pixels: 2480 × 3508

A4 at 300 DPI is 2480 × 3508 pixels

A4 (210 × 297 mm) at 300 DPI is 2480 × 3508 pixels, which is 8.7 megapixels.

Portrait	2480 × 3508 pixels
Landscape	3508 × 2480 pixels
With 3 mm bleed	2551 × 3579 pixels
Megapixels	8.7
Aspect ratio	1.41:1 (1 to √2 before rounding)
File size	25 MB as uncompressed 8-bit RGB; a JPEG or PNG is smaller
Paper size	210 × 297 mm (8.27 × 11.69 in)

Portrait

2480 × 3508 pixels

Landscape

3508 × 2480 pixels

With 3 mm bleed

2551 × 3579 pixels

Megapixels

8.7

Aspect ratio

1.41:1 (1 to √2 before rounding)

File size

25 MB as uncompressed 8-bit RGB; a JPEG or PNG is smaller

Paper size

210 × 297 mm (8.27 × 11.69 in)

The working

Pixels are inches multiplied by the resolution, and an inch is 25.4 mm.

Width: 210 mm ÷ 25.4 = 8.268 in; 8.268 in × 300 = 2,480.3, which rounds to 2480 pixels.
Height: 297 mm ÷ 25.4 = 11.693 in; 11.693 in × 300 = 3,507.9, which rounds to 3508 pixels.

Bleed is extra image past the trim line, so that a cut that lands slightly off still leaves ink to the edge. Print shops usually ask for 3 mm on every side of an A-series page, which makes the file 2551 × 3579 pixels.

Is your photo big enough?

To fill A4 at 300 DPI an image needs at least 2480 × 3508 pixels. Cropped to fill the sheet:

A 12 megapixel phone photo (4000 × 3000) gives 342 DPI: enough.
A 24 megapixel camera photo (6000 × 4000) gives 484 DPI: enough.
A 48 megapixel photo (8000 × 6000) gives 684 DPI: enough.

At 300 DPI the pixels of a print blend together from about 11.5 inches (29 cm) away. 300 DPI is the standard for print that is held in the hand: books, magazines, photo prints, business cards and flyers. At reading distance the eye can no longer pick out the pixels.

A4 at other resolutions

Resolution	Pixels	With bleed	Megapixels	Uncompressed
72 DPI	595 × 842	612 × 859	0.5	1.4 MB
96 DPI	794 × 1123	816 × 1145	0.89	2.6 MB
100 DPI	827 × 1169	850 × 1193	0.97	2.8 MB
150 DPI	1240 × 1754	1276 × 1789	2.2	6.2 MB
200 DPI	1654 × 2339	1701 × 2386	3.9	11 MB
240 DPI	1984 × 2806	2041 × 2863	5.6	16 MB
300 DPI	2480 × 3508	2551 × 3579	8.7	25 MB
400 DPI	3307 × 4677	3402 × 4772	15	44 MB
600 DPI	4961 × 7016	5102 × 7157	35	100 MB
1200 DPI	9921 × 14031	10205 × 14315	139	398 MB

A4 is the standard page for letters and documents everywhere outside North America. See A4 in pixels at every resolution or everything at 300 DPI.

A4 at 300 DPI is 2480 × 3508 pixels

The working

Is your photo big enough?

A4 at other resolutions

Other sizes at 300 DPI