What DPI for printing? The standard and when to change it
The standard DPI for printed work is 300 pixels per inch at the printed size. When 150 is enough, when line art needs 600, and what print services ask for.
Published
The standard for printed work is 300 DPI: 300 pixels of image for every inch of paper, measured at the size it will be printed. Use it for anything held in the hand, such as photos, books, flyers and cards. Posters and canvases seen from a step back look sharp at 150. Black-and-white line art, where every edge is either ink or paper, is supplied at 600 or more.
This page is about pictures and pages for print, not the DPI setting of a mouse. The number describes the image you send, not the printer. Print shops say DPI where the careful term is PPI, pixels per inch; for an image file the two mean the same thing, as DPI vs PPI explains.
What print services ask for
The 300 figure is not folklore. It is written into the file requirements of companies that print books, and into Adobe’s advice:
| Source | What it says |
|---|---|
| Amazon KDP, paperback covers | Images “placed in your document at a minimum resolution of 300 DPI” |
| IngramSpark, File Creation Guide | “300 ppi” for colour pages; for black-and-white books, “600 ppi for 1-bit black & white line art” and “300 ppi for 8-bit grayscale continuous tone images” |
| IngramSpark, covers | Images “less than 200 ppi may be rejected” |
| Lulu, book interiors | “Images should be 300 ppi resolution” |
| Lulu, covers | “300 PPI resolution minimum, not exceeding 600 PPI” |
| Adobe | “If the final product is a photograph, flyer or business document, the general benchmark to achieve a high-quality print is 300 DPI” |
Sources: KDP, Create a Paperback Cover; IngramSpark File Creation Guide, the edition dated 8.24.26; Lulu, PDF Creation Settings; Adobe, DPI resolution. All read in October 2026. These are each company’s own rules and they change, so check the current page of whoever is printing your job.
Three things stand out. Every one of them says 300 for photographs and tone. IngramSpark asks for line art at twice that. And the floor for rejection is lower than the target: IngramSpark’s guide warns below 200 on covers, which tells you that a little under 300 is tolerated and a lot under is not.
Why 300, and why distance changes it
A print looks sharp when its pixels are too small for the eye to separate. A person with 20/20 vision can separate details about one minute of arc apart, a sixtieth of a degree. From that, the distance at which the pixels of a print blend together is simple geometry:
| Resolution | Pixels blend from about |
|---|---|
| 300 DPI | 29 cm (11.5 in) |
| 200 DPI | 44 cm (17 in) |
| 150 DPI | 58 cm (23 in) |
| 100 DPI | 87 cm (34 in) |
| 72 DPI | 1.2 m (48 in) |
A book is held about 30 cm away, and at that distance 300 is where the pixels disappear. (The figure itself comes from the press: about two pixels for each line of a magazine’s halftone screen, as DPI vs PPI explains.) A poster on a wall is seen from further away, so it needs fewer pixels per inch to look the same. This is a rule of thumb from the geometry of the eye, not a printing standard, but it matches practice: Adobe’s page says a poster needs “at least 100 DPI”, “depending on its size and distance from the viewer”.
So choose by how the print will be seen:
| Printed thing | Seen from | Aim for |
|---|---|---|
| Photo prints, books, magazines, cards, flyers | Arm’s length | 300 DPI |
| Small type and line art in black and white | Arm’s length | 600 DPI or more |
| Posters, canvases, framed wall art | A step or two back | 150 DPI, more if you have it |
| Banners, signs across a room | Several metres | 72 to 100 DPI |
Adobe also notes that 180 and 240 PPI are “common choices” for non-commercial work and smaller designs.
Why line art needs more
A photograph is printed as tone, and tone hides the pixel grid. Line art has no tone: a black line on white paper is printed as solid ink at the full sharpness of the device, so a staircase along a diagonal edge shows. That is why IngramSpark’s guide doubles the figure to 600 ppi for 1-bit black-and-white art. The same applies to scanned signatures, logos, comics inked in black, and small text saved as an image. Where you can, keep text and logos as vectors and the question does not arise: a vector has no pixels. See raster vs vector.
More than 300 does little for a photograph. At 600 the file has four times the pixels, and Lulu’s rules cap cover images at 600. See 300 vs 600 DPI.
DPI is pixels divided by size
There is one sum behind all of this:
pixels needed = print size in inches × DPI
| Print size | At 150 DPI | At 300 DPI |
|---|---|---|
| 4 × 6 in | 600 × 900 | 1200 × 1800 |
| 5 × 7 in | 750 × 1050 | 1500 × 2100 |
| 8 × 10 in | 1200 × 1500 | 2400 × 3000 |
| A4 | 1240 × 1754 | 2480 × 3508 |
| 16 × 20 in | 2400 × 3000 | 4800 × 6000 |
| 24 × 36 in | 3600 × 5400 | 7200 × 10800 |
A 16 × 20 inch print at 150 DPI needs exactly the pixels of an 8 × 10 at 300: 7.2 megapixels. A 24 × 36 inch poster at 150 needs about 19 megapixels, and at 300 it would need 78, more than most cameras deliver. Large prints are made at lower resolution because they are seen from further away, and because the pixels are not there.
The DPI calculator does this for any size, and each size has its own page, for example A4 at 300 DPI. To go the other way, from a camera to the largest print, see the megapixel pages such as 12 megapixels: how big can you print?.
The number in the file is not the point
An image file can carry a DPI value, and software shows it as “resolution”. That stored value only says how large to print the pixels. A 3000 × 2400 pixel photo tagged 72 DPI and the same photo tagged 300 DPI are the same picture; printed 10 inches wide, both give 300 pixels to the inch.
What a printer wants is enough pixels for the size. Check with the sum above, or drop the file on the image DPI checker, which shows the size it prints at 300. If an upload form rejects the file for its stored DPI alone, the DPI converter changes the tag without touching the pixels.
If the pixels are short, there are three honest choices: print smaller, accept a lower DPI for a print seen from further away, or find a larger original. Resampling the image up to reach 300 makes the file pass a check but adds no detail; Adobe’s own guide warns that it “can degrade image quality”. A sharp 150 DPI print beats an upscaled 300 DPI one.
Printer DPI is a different number
An inkjet advertised at 1440 DPI or more is describing ink dots, not image pixels. It lays several dots to make each pixel’s colour. You do not match the image to that figure: send 300 pixels per inch and choose the printer’s quality setting.
A checklist before you send a file
- Find the final printed size, including any bleed the printer asks for.
- Multiply by 300 for hand-held print, 150 for wall art, 600 for black-and-white line art.
- Compare with the pixels you have.
- Place images at 100% in the layout, as KDP’s guide asks. An image stretched to twice its size has half its resolution.
- Read the printer’s own file guide. It overrides any general rule, including this one.
Questions
Is 72 DPI ever right for print? Only for something seen from more than a metre away. For a screen the number is irrelevant. See 72 vs 300 DPI.
Is 200 DPI good enough? Often. Its pixels blend from about 44 cm, so it suits anything that is not held close, and IngramSpark’s guide treats 200 as the floor for cover images. For small type, stay at 300.
What is the minimum DPI for printing? There is no single minimum. It depends on distance: about 300 in the hand, 150 on a wall, less across a room. Individual printers set their own floor.
What DPI should I scan at? That is a separate question, because a scan can be enlarged. See what DPI to scan photos and what DPI to scan documents.