Is my image big enough for an 18×24 poster?
Posters are seen from further away, so they need fewer pixels per inch than small photos. Upload to check.
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Pixels needed for 18×24 in
For a print of 18″ × 24″, the pixels you need are the size in inches multiplied by the pixels per inch (PPI) you want.
| What it gives you | Pixels per inch | Pixels (portrait) |
|---|---|---|
| Sharp at this size | 200 | 3,600 × 4,800 px |
| The least we call enough for normal viewing distance | 120 | 2,160 × 2,880 px |
These two figures are Osmanth Image's own guideline for this size, based on how far people usually stand from it. They are not a printer's requirement, and a printer may ask for more. Swap width and height for a landscape print. Below the lower figure the check tells you the print will look soft. For other sizes, see poster size in pixels.
How the check works
Print quality depends on how many pixels cover each inch of paper. We measure that from the real pixels in your image and the size you want. The “DPI” number saved inside a file doesn't change quality, so we never rely on it.
Bigger prints are seen from further away, so a poster needs fewer pixels per inch than a small photo. We also look at how the image was saved and at its colours, and we never stretch your image: if the shape doesn't match, you choose how to crop.
We don't invent pixels. If an image doesn't have enough for the size you picked, we tell you how big it prints well instead.
When your file is ready, we open the finished file again and check it before we call it ready. Printers change their requirements, so where we couldn't confirm a printer's own page, we say so instead of guessing.
Working with a PDF? That's Check Before Submit, which checks page size, fonts, colours and more.