DPI
Checker
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Minimum pixel dimensions by product
| Product | Print size | At 300 DPI | At 150 DPI |
|---|---|---|---|
| Sticker 3x3" | 3x3" | 900x900 | 450x450 |
| Phone Case | 3x6" | 900x1800 | 450x900 |
| Mug Wrap | 9.5x3.5" | 2850x1050 | 1425x525 |
| T-Shirt Print Area | 12x16" | 3600x4800 | 1800x2400 |
| Poster 18x24" | 18x24" | 5400x7200 | 2700x3600 |
| Poster 24x36" | 24x36" | 7200x10800 | 3600x5400 |
What is DPI and why does it matter?
DPI stands for dots per inch — the number of printed dots that fit in one linear inch. Higher DPI means sharper, more detailed prints. A 3000x3000 pixel image printed at 10x10 inches gives you 300 DPI: professional quality. Print that same image at 20x20 inches and you drop to 150 DPI — still acceptable for posters viewed at a distance, but noticeably softer up close.
DPI vs PPI — what's the difference?
PPI (pixels per inch) describes your digital image. DPI (dots per inch) describes the physical print. In practice, most print-on-demand providers use these interchangeably. When they say "upload at 300 DPI" they mean your image should have enough pixels to produce 300 pixels per inch at the final print size. A file's embedded DPI metadata doesn't change how many pixels it has — it only suggests a default print size.
What DPI do I need for print-on-demand?
For products viewed up close (stickers, phone cases, mugs), aim for 300 DPI. For larger items viewed at arm's length or further (posters, wall art), 150 DPI is the minimum acceptable quality. T-shirts sit in between — 150 DPI works for DTG printing since the fabric texture softens the image naturally, but 200+ DPI is noticeably better for detailed designs. When in doubt, design at the largest dimensions you can. You can always scale down; scaling up loses quality.
How to increase your image resolution
The best approach is to create your artwork at high resolution from the start. Work at 300 DPI at your largest intended print size. For digital art, use high-resolution canvases in your design tool. For photography, shoot in RAW or the highest quality your camera supports. AI upscaling tools (Topaz, Real-ESRGAN) can help recover detail in existing images, but they can't invent detail that was never captured — use them as a last resort, not a workflow.