About This Tool
The image DPI viewer reads the pixel density stored in a file. It helps you understand the print size at that density and see when a file has no density information or contains conflicting values.
How to Use
- Choose a PNG, JPG/JPEG, or static WebP image.
- Review the horizontal DPI, vertical DPI, and original density information for each source.
- If several different values appear, compare the print dimensions for each one.
- If no density is found, you can still check pixel dimensions. The tool will not fill in a default DPI.
Supported Formats
- PNG, JPG/JPEG, and static WebP images are supported. Choose or drop in one image at a time.
- Files can be up to 100 MiB, 40 million pixels, and 16384 pixels on either side. Large images need more memory, so choose a size that works well on your device.
Understanding the Results
- JPEG density can come from JFIF or EXIF. PNG can store pixels per unit in pHYs, which converts to DPI when the unit is meters. Other formats show density only when readable information is present.
- If EXIF and JFIF contain different densities, both sources are kept and the conflict is flagged. The tool does not choose one for you.
- When density is missing or has no physical unit, the tool reports that no usable DPI was found. It does not assume 72, 96, or 300 DPI.
- When valid density is available, print dimensions are shown in inches and centimeters. Rotated photos use density axes that match their displayed orientation.
DPI and Pixels
- Pixel dimensions tell you how much image information is present. Density relates those pixels to a physical size. They measure different things.
- Print width in inches = pixel width ÷ horizontal density. Multiply inches by 2.54 for centimeters. For example, 3000×2400 pixels at 300 DPI gives a 10×8-inch print.
- Changing the density value alone does not add pixels or detail. Labeling the same image as 72 DPI or 300 DPI does not change its pixel count.
Privacy
Your images are processed only in your browser and are never uploaded to a server.
EXIF may contain location, time, and device information. All information is read locally in your browser and is never uploaded.
The tool does not automatically save your input or results. Copy or download anything you need before clearing or leaving the page, and keep the original image.
FAQ
What is the difference between DPI and PPI?
DPI usually refers to printer dots per inch, while PPI refers to image pixels per inch. Image density is often called DPI; this tool shows the value stored in the file and its source.
What does 300 DPI mean?
For image density, it means 300 image pixels per inch. An image that is 3000 pixels wide corresponds to 10 inches at that density.
Why does my image have no DPI information?
Some images store only pixel dimensions, without physical density. Saving or sharing can also remove density information. This does not mean the image is damaged, and its DPI cannot be guessed.
Will changing an image to 300 DPI make it sharper?
Changing the DPI value alone does not add pixels or detail. It changes how the print size is interpreted. More detail requires a higher-quality original image.
How do I calculate print dimensions from DPI?
Divide pixel width and height by their respective pixels-per-inch values to get inches, then multiply by 2.54 for centimeters. Calculate each axis separately if the densities differ.