Free Image DPI Checker for Print

How to calculate DPI for printing

Effective DPI is pixels ÷ print size in inches. A 1800-pixel-wide image printed 6 inches wide is 300 DPI. Printed 12 inches wide, the same image is only 150 DPI. The calculator checks width and height and uses the lower value.

What DPI is good enough?

• 300 DPI or more — the usual target for close-viewed print like flyers, cards and brochures.
• 150–299 DPI — may be acceptable for posters or items viewed from further away. Check with the customer.
• Under 150 DPI — likely to look soft or pixelated. Ask for a larger file.

Bleed size

Bleed is extra image beyond the trim edge so there's no white line after cutting; 0.125 in (3 mm) per edge is common. A 6 × 4 in card with 0.125 in bleed needs artwork at 6.25 × 4.25 in. This tool gives you that size; it can't check whether the file actually contains bleed.

Check what fills the trim before treating the number as final

Enter the pixels of the image you plan to place and the finished dimensions of that placement. To fill a photograph into a different shape, use a consistent scale and select a crop. A 3,000 × 4,500 pixel portrait placed into 8 × 10 inches fills the width at 375 PPI. At that scale, 10 inches needs only 3,750 pixels of height. The remaining 750 pixels are cropped from the long edge. A different crop position preserves different detail, even when the measured density stays the same.

If you preserve the whole image instead, fit the shorter printed side inside the available area and allow borders where needed. When the artwork sits on a larger canvas, check the placed dimensions of important images separately. A small photo stretched to cover half of a poster can have a different effective density from other artwork inside the same file.

Read the threshold beside the printer’s specifications

The status is a quick signal based on common density targets. Posters, fine line art, and small photographed text can need different treatment. Check the provider’s requirement for this item, especially if a viewing distance or source format influences the recommendation. When the file must cover bleed, confirm effective resolution over the bleed-inclusive area and inspect whether the design actually extends there.

Keep a copy of the approved crop and export. If a customer changes from a short postcard to a poster, recheck the actual source rather than increasing the metadata resolution. You may need to request a higher-quality original, adjust the layout, use a border, or print a smaller size. Review type, transparency, and color independently with your production workflow. See the full artwork intake checklist for those separate checks.

Image PPI describes the source pixels per printed inch. The device’s DPI describes how it places dots. A high printer setting does not add missing source detail. Inspect a sample when the job includes a subtle texture or small type that the numeric result cannot judge.