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Image DPI Checker: Find a Photo's DPI and Print Size
Check an image's DPI online: read the DPI stored in the file and see how large it will actually print, for free and without uploading.
Image DPI Checker: Find a Photo's DPI and Print Size: TOEA reads the DPI metadata stored in a PNG or JPEG and shows its pixel dimensions, horizontal and vertical density, and the print size those values imply. DPI describes how tightly pixels are placed on paper; it does not measure the detail in the image. To plan sizes at a density you choose, use [Print Size Calculator](/print-size-calculator). Runs 100% locally in your browser with zero server file uploads.
- Category
- Image tools
- Runs
- In your browser
- Cost
- Free · no sign-up
- Availability
- Ready to use
Runs entirely in your browser
PNG or JPG · density lives in the file header
DPI metadata and pixel resolution
Pixel dimensions tell you how much image data you have. DPI metadata suggests how many pixels should fit in each printed inch; for an image this is more precisely pixels per inch, while printer DPI describes dots of ink. The checker reads the density stored in PNG or JPEG metadata and calculates print width and height from it.
Divide pixels by density to get inches: 3000 ÷ 300 = 10. A 3000 × 2000 image at 300 DPI therefore prints at 10 × 6.67 inches. Changing the density label leaves the pixels unchanged. No density stored means no physical print size is declared, not that the image has no detail.
Worked print sizes at 300 DPI
For a full-sheet print, multiply the paper dimensions in inches by 300, rounding up to whole pixels. A4 uses millimetres, so divide by 25.4 first. These examples exclude bleed and assume the image is cropped or fitted to the paper's aspect ratio.
| Paper size | Calculation at 300 DPI | Pixels needed | |
|---|---|---|---|
| A4 | 210 × 297 mm | (210 ÷ 25.4) × 300; (297 ÷ 25.4) × 300 | 2481 × 3508 |
| Letter | 8.5 × 11 inches | 8.5 × 300; 11 × 300 | 2550 × 3300 |
| Photo | 4 × 6 inches | 4 × 300; 6 × 300 | 1200 × 1800 |
A high DPI label is not enough if the pixel dimensions are too small. Choose a smaller print or a source with more detail; resampling cannot recover missing detail.
How to use it
- Choose a PNG or JPG.
- Read the declared density.
- Check the print size before sending it on.
Privacy & limitations
The image is read in your browser and never uploaded. A file that declares no density is reported as such rather than given a default.
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Frequently asked questions
What is the difference between DPI and pixel size?
Pixel size is the number of pixels across and down, such as 3000 × 2000. DPI metadata is a suggested print density. At 300 DPI that image prints at 10 × 6.67 inches; changing the metadata alone does not add pixels or sharpen it.
How many pixels do I need for A4 or Letter at 300 DPI?
Multiply each side in inches by 300. A4 is 210 × 297 mm, so allow about 2481 × 3508 pixels, rounding up. Letter is 8.5 × 11 inches, so it needs 2550 × 3300 pixels. These figures cover the whole sheet without extra bleed; crop or fit the image if its aspect ratio differs.
What does no DPI stored mean?
The file has no usable print-density metadata. That is normal for images made for screens and does not mean the image has no resolution. Use its pixel dimensions and your intended print size to calculate the required density; a printer or editor may choose its own default.
Free tool · runs in your browser · no account required