Image DPI and Print Size Calculator

Calculate print size from image pixels and DPI, or find required pixel dimensions for 300 DPI printing. Upload an image to inspect print quality and export with updated 300 DPI metadata.

• Two-way calculator: Pixels → Print Size (in/cm/mm) at any DPI, and Print Size → Required Pixels
• Upload any image to automatically evaluate print suitability across standard paper sizes (4×6", 8×10", A4, A3, Poster)
• Real binary DPI metadata writer: export your uploaded JPG or PNG with 72, 150, 300, or 600 DPI header tags
• Clear explanation of DPI metadata vs actual pixel resampling

Frequently Asked Questions

Does changing the DPI header of an image change its pixel dimensions?

No. DPI (dots per inch) is a print instruction telling printers how densely to space existing pixels on paper. A 3000×2400 px image has the same pixels at 72 DPI or 300 DPI, but prints at 10×8 inches at 300 DPI.

How many pixels do I need for a sharp 8×10 inch print at 300 DPI?

Multiply each inch dimension by 300: 8 × 300 = 2400 pixels wide, and 10 × 300 = 3000 pixels tall (7.2 megapixels).