Check the original before you enlarge it
Choose a PNG, JPG or WebP image and enter the intended printed width. The tool reads the dimensions in your browser; it does not upload your image. Enter the print width and height, then compare Fit with Fill. You can also enter pixel dimensions manually.
Effective DPI is image pixels divided by printed inches. Changing the DPI number in an export dialog without adding real detail does not make a low-resolution photograph sharper.
- Use the original export rather than a screenshot or a downloaded chat preview.
- For a close-viewed shirt logo or small sticker, inspect fine lines and text at the intended size.
- Large banners are often seen farther away. A planning DPI value is not a guarantee that small text will be readable.
The same image, at different sizes
A 2400-pixel-wide image produces the following effective resolution when you keep its proportions. These are calculations, not a pass or fail certificate for every design.
| Printed width | Effective resolution | What to check |
|---|---|---|
| 8 inches | 300 DPI | Fine lines, transparent edges and small lettering |
| 12 inches | 200 DPI | The actual shirt or sticker viewing distance |
| 24 inches | 100 DPI | Whether the design is mostly large shapes or a photograph |
| 96 inches / 8 feet | 25 DPI | Find a larger original or simplify the design before ordering |
Keep the file practical
This checker handles PNG, JPG and WebP. The product editor also offers single-page PDF and HEIC conversion where supported; check that converted preview in the editor. The artwork upload limit is 20 MB per file, and the image workflow supports up to 40 million pixels.
A 4 × 8 ft banner is 48 × 96 inches. At 75 DPI, a full-size raster is 3600 × 7200 pixels. At 100 DPI it becomes 4800 × 9600 pixels, exceeding the current 40-million-pixel workflow. Do not enlarge a small source merely to reach either number.
Common questions
Does this improve or edit my image?
No. It measures resolution and keeps the original image unchanged. If the source lacks detail, use a better original or print it smaller.
Can I use a PDF?
Enter the dimensions of an embedded raster image manually, or open the single-page PDF in the product editor and inspect its converted preview. A vector PDF does not have one universal image DPI.