DPI and page-size calculator
Estimate the pixel size you need for Letter, A4, or a custom page with margins — before you convert images to PDF.
Page and print area
Content area: 7.5 × 10 in
Target pixels at 150 DPI: 1125 × 1500 px
Check an existing image
At 150 DPI this image prints about 8.5 × 11 in.
It is larger than the content area — shrink the image, lower DPI, or reduce margins.
How to use this with PDFLines
Export or crop images near the target pixel size, then convert them with PNG to PDF or JPG to PDF. PDFLines currently places each image on its own page; this calculator helps you choose source resolution before upload.
Common print targets: about 150 DPI for on-screen review packets, 300 DPI for sharp paper printing.