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PDF DPI Checker

Audit embedded image resolutions across PDF pages to calculate effective DPI (dots per inch) and ensure commercial print readiness in memory.

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How to use this tool

  1. Upload or drag and drop your PDF document into the dropzone (up to 50 MB, 1000 pages).

  2. The preflight engine inspects every embedded image XObject and calculates effective horizontal and vertical DPI against its displayed bounding box.

  3. Review the interactive audit summary: Overall print-readiness badge, lowest DPI, average DPI, and detailed per-page image breakdown table.

  4. Optionally download the full JSON audit report or chain your document into compression or archiving tools.

Frequently asked questions

Quick answers about file privacy, processing modes, formats, and device support.

Computer monitors and mobile screens render images at 72 to 144 DPI, making photos look deceptively crisp on screen. Physical printing presses, offset printers, and laser copiers lay down physical halftone dots; without at least 300 DPI, photos and diagrams will suffer from visible blurring, pixelation, and jagged edges.
Nominal DPI is merely a static metadata tag stored in an image header. Effective DPI measures the actual pixel density on the page canvas by dividing the image's raw pixel width by its physical displayed width in inches (e.g., an image with 1200 pixels displayed across 4 inches has an effective resolution of 300 DPI).
If low-resolution images are detected, you should re-export or replace those assets with higher-resolution originals in your source design software (InDesign, Illustrator, Word, Canva) before sending to a commercial print shop, or scale down their displayed dimensions on the page.
PDFs composed entirely of vector typography, embedded fonts, tables, and vector curves have infinite resolution. They scale mathematically to any size and print with perfect sharpness on any printing press without DPI constraints.
No. All image inspection and DPI coordinate calculations run strictly in-memory (RAM) inside ephemeral execution containers. No files, images, or metadata are ever saved to disk or persistent databases.

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