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“Printful shows a print quality warning on my design”: How to fix a low-DPI print file for print on demand

Short answer

A print quality warning on Printful means your file has too few pixels for the print area you placed it on. Printful asks for 150 to 300 DPI depending on the product: at least 150 for most apparel and large prints, and 300 for paper prints, phone cases, stickers and fine detail. The fix is a file made at the full print size, not a small one stretched to fit. Silentt Design’s free DPI calculator gives the pixel size for any print area.

Updated November 11, 2026 · by Azaan Ali, print designer
Fix my file · $25 Same day, fixed price, one round of changes included. Or ask a designer first.

Why printers ask for this

DPI here is pixels divided by printed inches. Printful’s example: a 5 × 5 in file at 100 DPI stretched to 10 × 10 in drops to 50 DPI. So a design that looked sharp as a small chest logo can trigger a warning when it’s scaled up to fill the back of a hoodie. Printful’s help center says to check any print quality warnings before you save or submit the product.

The required DPI is set per product. Printful says most apparel and large-format products need at least 150 DPI, while paper prints, smaller products and products with fine detail may need 300, and that it’s best not to go above 300. Each product page has a File guidelines section with the exact print area and a template to download.

Two more things cause trouble on print-on-demand files. Printful wants files in the sRGB color profile (sRGB IEC61966-2.1), not CMYK, and converts the color itself. And exporting with Photoshop’s Save for Web often drops the file to 72 DPI. For shirts, a PNG with a real transparent background is the safe format, since a JPEG prints its white background.

How to fix a low-DPI print file for Printful

  1. Open the product’s File guidelines on Printful and note the print area in inches and the DPI it asks for. Download the template if there is one.
  2. Multiply to get the pixel size: a 12 × 16 in print at 150 DPI is 1,800 × 2,400 pixels, and at 300 DPI it’s 3,600 × 4,800. The free DPI calculator does it for any size.
  3. Go back to the source. Export the design again from its original file at that pixel size. Don’t enlarge the small PNG you already uploaded.
  4. If the design is a logo, text or flat illustration, rebuild it as a vector and export the PNG from that at any size you need.
  5. If the source is an AI image or a photo with no bigger version, upscale it carefully and check it at 100%, or print it smaller. Scaling a design down on the product raises its DPI.
  6. Export in sRGB with Save As or Save a Copy, not Save for Web. Use PNG if the background should be transparent, and zoom in on the edges for leftover pixels.
  7. Upload the new file, place it without stretching it, and check that the warning is gone before you save the product.
Do it free in your browserCheck an image’s DPI at print size, free Is this image big enough? How large can it print? Pixels needed for any size.

Or send it to us

  • Rebuild the design at the full print size for the product, at the DPI Printful asks for
  • Redraw logos, lettering and flat artwork as vectors, so one file covers every product
  • Clean the background so it’s truly transparent, with no white box or stray pixels
  • Export in sRGB as PNG, sized to Printful’s template and ready to upload
Fix my file · $25 Same day, fixed price, one round of changes included. Or ask a designer first.

Questions

What DPI does Printful need?
Between 150 and 300 depending on the product. Printful says most apparel and large-format products need at least 150 DPI, and paper prints, phone cases, stickers and fine detail may need 300. Check the File guidelines on the product page.
Can I just change the DPI setting to 300?
No. Changing the number without adding pixels only changes the label. Printful’s own advice is not to enlarge a small, low-resolution image and expect it to print sharply.
Should a Printful file be CMYK?
No. Printful asks for the sRGB IEC61966-2.1 color profile and converts the color for printing itself. Very bright screen colors can still print less vivid than they look on a monitor.
Does this apply to Printify and other print-on-demand sites?
The idea is the same everywhere: enough pixels for the print area. The exact DPI and file size differ by site and by product, so check that site’s own file requirements.
How much does it cost to fix a print-on-demand file?
From $25 a file to rebuild it at the right size so it prints sharp. Send the design and the product in the chat, and you get a fixed price before anything starts.

Terms on this page: DPI / PPI (resolution), Raster (bitmap), Vector, RGB.

Sources: Printful: how to prepare a print file for the best results, Printful: create the perfect DTG file.

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Related problems

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More on this kind of work: T-shirt & apparel design. Something else wrong with the file? See every printer message we fix.

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