Check a file before ordering
Read an image’s dimensions locally and compare them with the exact print size you intend to buy.
Private image DPI calculator
Check your image’s effective print resolution.
Choose an image or enter its pixels, add the intended physical print size, and see whether the available resolution is suitable.
Instant resultsNo signupRuns in your browser
Effective print resolution300 PPIUses the lower-resolution axis
- Horizontal resolution
- 300 PPI
- Vertical resolution
- 300 PPI
Print checkExcellentSuitable for close-viewed quality printing.
When to use it
Start with the result you need
This calculator is most useful when one part of the print specification is known and another needs to be checked.
Diagnose a low-resolution warning
See whether the warning comes from too few pixels, an oversized print or a crop that reduced the usable image.
Compare two image versions
Test an original and an exported copy at the same print size to see which preserves more effective resolution.
The calculation
How it works
Divide each pixel dimension by the corresponding print dimension in inches: PPI = pixels ÷ inches. The lower result is the limiting effective resolution.
Changing only the DPI metadata does not create new image detail. Actual print resolution depends on the pixel count and physical output size.
Quick reference
How to interpret effective print resolution
These are practical planning ranges, not universal production rules. Viewing distance and the printing process matter.
| Effective PPI | General interpretation | Best next check |
|---|---|---|
| 300 PPI or more | Common close-viewed quality target | Confirm export and sharpening |
| 240–299 PPI | Often very good for general printing | Inspect detailed areas |
| 150–239 PPI | May suit posters and wall art | Check expected viewing distance |
| Below 150 PPI | Softness may be visible nearby | Reduce size or find a larger source |
Fine text, line art and highly detailed images can need different treatment from continuous-tone photographs.
Check the numbers
3600 × 2400 px at 12 × 8 inches
Both dimensions provide 300 PPI, a common target for close-viewed photo printing.
2400 × 1600 px at 24 × 16 inches
The result is 100 PPI. This may work for a poster viewed at a distance but is low for a close-viewed photo print.
3000 × 3000 px at 10 × 10 inches
The square print receives 300 PPI in both directions with no aspect-ratio crop.
Before you export
Common mistakes to avoid
Changing only the metadata
Relabelling a file from 72 to 300 DPI does not add pixels. Effective PPI still depends on pixels divided by inches.
Checking only one dimension
Calculate both width and height. The lower effective value limits the result, especially after cropping.
Using a compressed copy
A file saved by messaging or social platforms may be smaller than the original. Locate the highest-resolution source first.
Check your image’s effective print resolution. FAQ
Is my image uploaded?
No. Your browser reads the image dimensions locally. The file is not sent to ReadyForPrint.
Is DPI stored inside an image?
Some formats store a DPI or PPI metadata value, but changing that tag alone does not add pixels or improve detail. Effective print resolution depends on pixels divided by print size.
What is a good image resolution for printing?
300 PPI is a common target for close viewing, while 240 PPI is often very good. Larger displays viewed from farther away can require less. Follow the printer’s specification.
Reviewed for accuracy: 28 July 2026