What is DPI and how does it affect PDF print and display quality?

DPI (Dots Per Inch) defines raster resolution. 72 DPI is standard for web viewing, 150 DPI is balanced for tablets, and 300 DPI is required for commercial offset printing.

When should I resample a PDF to 300 DPI?

Choose 300 DPI when preparing PDF files for professional commercial printing, high-resolution brochures, corporate annual reports, or legal archives.

When should I downsample a PDF to 72 DPI or 150 DPI?

Choose 72–150 DPI to minimize file size for fast email delivery, website downloads, mobile app previews, and lightweight storage.

Does changing DPI alter the physical dimensions (A4 / Letter) of a PDF page?

No. Page physical dimensions remain identical; only the pixel density of embedded raster images is scaled.

Will vector text and fonts lose resolution when changing PDF DPI?

No. Native vector text, TrueType fonts, and line art scale mathematically and remain crisp regardless of raster DPI settings.

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