Photo Resolution for Printing: Pixels, DPI, and Quality Warnings
· 5 min read
Understanding photo resolution ensures crisp prints. Learn the difference between the 600-pixel minimum for uploading and the 100 DPI warning for print sharpness.
Pixels matter most
The actual pixel dimensions of your file determine how large it can be printed. Do not artificially enlarge a file just to increase its pixel count; the tool evaluates the true image data available.
The 600-pixel minimum
To even upload a photo, its shorter side must be at least 600 pixels. After you choose a format and the image is cropped, the remaining visible area must still be at least 600 pixels on both sides. Otherwise, it cannot be added to the cart.
What DPI means for you
DPI (dots per inch) measures print density. The tool calculates DPI based on your file's pixels and the physical print size. A warning appears if the DPI falls below 100, indicating the print may appear softer up close.
How to react to warnings
If you receive a DPI warning, consider choosing a smaller print size or finding a higher-resolution version of the photo. If the system blocks the cart due to the 600-pixel rule, you must either pick a smaller size or crop less of the image.
Practical check before confirming
A good checking routine starts with the file, not the chosen product. If possible, open the original version of the photo and check its pixel dimensions. Then choose the desired format and observe whether the change in aspect ratio cuts off a significant area. Only then interpret the quality message: a shorter side of less than 600 pixels stops the upload, a cut area of less than 600 pixels on either side stops adding to the cart, and less than 100 DPI gives a warning. These three messages mean different things. A smaller format or the photo's more natural aspect ratio can often help without artificially altering the picture.
If you have two files from the same moment, usually prefer the original with larger pixel dimensions. Don't enlarge the file just for the numbers: the creator's quality message is based on the image area being used.
Quick Checklist
- Are you using the original file with the largest pixel dimensions?
- Is the shorter side of the file at least 600 pixels?
- Did you check the usable cut area after selecting the format?
- Do you know that under 100 DPI is a warning, not a block?
- Do you distinguish this from a situation where a cut side is under 600 pixels?
Don't base your decision solely on on-screen sharpness. Screen and print sizes are different situations; the quality message in the ordering view links the file to a specific size.
Example of making a decision: if a phone photo gives a DPI warning at a larger size, don't assume ordering is impossible. Compare a smaller size and closer aspect ratio of the same photo. If the cut area stays at least 600 pixels on both sides, you can consciously choose which size fits your wall and expectations.
The purpose of the quality message is to make the decision visible. Use it for comparison, not merely as a barrier or approval.
Before confirming, compare the preview with the original photo once more.
Check your photo's resolution by uploading it to the photo print tool.
Read more
The main photo printing article covers all basics. The cropping guide helps maintain pixel area.