Check PDF image DPI
What Check PDF image DPI actually does
A 300-PPI image can become a 150-PPI image when it is enlarged to twice its intended size. This preflight reads each PDF image's native pixel dimensions and placement transform, then reports the effective resolution on both axes at the size it will actually print.
How to use it
- Set the minimum resolution for screen, everyday print, or close-view print work.
- Inspect every raster placement by page, native pixels, placed size, axis resolution, and pass or low status.
- Download the complete preflight as CSV for a print job or JSON for another workflow.
Useful for
- Catch blurry photographs before a brochure, worksheet, or book goes to print.
- Locate the page where an image was enlarged beyond its useful resolution.
- Add a deterministic low-resolution gate to a print-production handoff.
Limits worth knowing
- Vector artwork and text are resolution-independent and are not listed as raster images.
- Resolution is one print-quality factor; bleed, color space, fonts, transparency, and compression need separate checks.
- The report measures source pixels at placement size and cannot restore missing detail.
Questions people ask
Is this DPI or PPI?
For a raster image, pixels per inch is the precise term. The phrase image DPI is commonly used in PDF and print searches, so the interface shows effective PPI while supporting that familiar name.
What threshold should be used?
300 PPI is a common target for close-view quality print, 150 PPI can suit everyday print, and lower values may be acceptable for screen use or large-format work viewed from farther away.
Does the PDF leave the browser?
No. The PDF operator list and image placement transforms are inspected locally; the site has no upload endpoint.