100% free · No signup · No watermark · Runs entirely in your browser
DPI (dots per inch) tells a printer how densely to pack an image's pixels on paper - and it only exists if someone embedded it in the file. This free image DPI checker parses your JPG's JFIF and EXIF headers and your PNG's pHYs chunk to report the true embedded DPI. If the file carries no DPI value (most web images do not), it says so honestly and hands you a print-size calculator instead.
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Drop an image here or click to browse
JPG, PNG, WebP, GIF, BMP, SVG - stays on your device
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Horizontal DPI
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Vertical DPI
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Data source
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Pixel dimensions
No DPI embedded in this file. That is normal: most web images, screenshots and phone photos carry no DPI value at all. Screens ignore DPI completely; it only matters when you print. Use the calculator below to see how large your image prints at any DPI.
Print-size calculator
Print size = pixels ÷ DPI. Enter the DPI your printer or print shop asks for.
Frequently asked questions
Is the DPI checker free?
Yes. Unlimited checks, no signup, no caps. All parsing happens locally in your browser.
Why does my image show no DPI?
Because no program ever wrote a DPI value into it. Screenshots, phone photos and web exports usually skip DPI entirely. The absence of DPI does not mean low quality: only the pixel dimensions decide how large you can print.
Does DPI matter for screens and websites?
No. Screens render pixels 1:1 and ignore DPI metadata completely. DPI only matters when software converts pixels to physical print size.
What DPI do I need for print?
300 DPI is the standard for crisp photo prints. 150 DPI works for large posters viewed at a distance. Anything under about 100 DPI looks soft up close.
Which formats can carry DPI?
JPEG (via JFIF headers or EXIF tags) and PNG (via the pHYs chunk). WebP, GIF and BMP rarely carry usable DPI data, so the tool focuses on JPG and PNG.
How do I check the DPI of an image?
Short answer: Upload the JPG or PNG to the checker above. It scans the file's headers for a JFIF density value, EXIF resolution tags or a PNG pHYs chunk and reports the horizontal and vertical DPI plus the source. If none of those exist, it tells you plainly that no DPI is embedded, which is the honest answer for most web images.
The whole check runs in your browser, so the file is never uploaded anywhere.
What does 300 DPI mean for printing?
Short answer: 300 DPI means 300 pixels are packed into every printed inch, the standard density for sharp photo prints. To find your print size, divide pixels by DPI: a 3000 x 2400 pixel image at 300 DPI prints at 10 x 8 inches. Use the built-in calculator above to do this math for any DPI.
More DPI is not always better: beyond 300 the human eye gains little, while file sizes keep growing.
Can I increase an image's DPI?
Short answer: You can change the embedded DPI number, but that alone adds no detail: it just tells the printer to render the same pixels smaller. True quality comes from pixel dimensions. If you need a bigger print, you need more pixels, which means reshooting, rescanning or AI upscaling.
Beware tools that claim to boost DPI for free: without new pixels, the print looks identical.
