Report fields
What the checker reads from your image
The checker looks for resolution metadata in common browser-readable image files. For JPEG, that usually means EXIF or JFIF density tags. For PNG, it means the pHYs chunk that stores pixels per meter. The report also calculates values that come directly from the image dimensions.
- Stored DPI metadata, including separate horizontal and vertical values when they differ.
- Pixel width and height, file size, format, megapixels, and aspect ratio.
- Estimated print size at 72, 150, 300, 600, and your selected target DPI.
- Whether the file can be rewritten by the browser-based converter.
What “DPI not found” means
A missing DPI tag is common, especially for images exported for the web. It does not mean the image is low quality by itself. Print sharpness still depends on pixel dimensions divided by the physical print size.
If a printer or upload form requires a 300 DPI label, use the converter to add metadata. If the final print needs more detail, you need more pixels or a smaller print size, not only a new DPI tag.
DPI checker vs print quality
DPI metadata tells print and design software how densely pixels should be placed on paper. The useful calculation is simple: pixels divided by DPI equals inches.
Private by default
The checker runs locally in the browser. That matters when images contain client work, unpublished product shots, scans, or private documents. The page reads the file to calculate the report, then the converter can rewrite JPG or PNG metadata without sending the image to a server.