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Check image DPI online

Instantly view your image's DPI, pixel dimensions, and file size. Verify if it meets print or web requirements.

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Upload any image to see its dimensions, file size, and format details

Common DPI requirements

Use CaseRequired DPINotes
Professional print300 DPIBooks, magazines, brochures, business cards
Large format print150 DPIPosters, banners — viewed from a distance
Photo printing300 DPIStandard photo prints, photo books
Web / screen display72–96 DPIWebsites, social media, email
Retina web display144–192 DPI2x assets for HiDPI screens
Government forms (India)200+ DPIUPSC, SSC, and other exam portals
Visa applications300 DPIUS, UK, Schengen visa photos

Check Image DPI — Free, Fast & Private

DPI (dots per inch) determines how sharp an image looks when printed. A 3000x2000 pixel photo at 300 DPI prints beautifully at 10x6.67 inches. The same photo at 72 DPI would need to print at 41.7x27.8 inches to use all its pixels — fine for a billboard, terrible for a business card.

Here is the part that confuses most people: DPI is a print concept. On screens, only pixel dimensions matter. A 1920x1080 image displays identically at 72 DPI and 300 DPI on a monitor. The DPI metadata only affects how a printer or design application interprets the image size. So when someone says "make this image 300 DPI," what they usually mean is "make sure it has enough pixels to print sharply at the intended size."

To calculate what you need: multiply the print size in inches by the required DPI. A 4x6 inch photo at 300 DPI needs 1200x1800 pixels. An A4 page (8.27x11.69 inches) at 300 DPI needs 2481x3507 pixels. If your image has fewer pixels than required, it will look soft or pixelated when printed.

Phone cameras produce more than enough pixels for most print needs. A 12MP phone camera captures 4032x3024 pixels — that is enough for a 13.4x10 inch print at 300 DPI. The file will likely say 72 DPI in its metadata, but that is just a default tag. The actual pixel count is what matters.

MiniPx shows you the pixel dimensions and file size of any image you upload. For print work, divide the pixel dimensions by your required DPI to calculate the maximum sharp print size. For web use, pixel dimensions are all you need to check.

How it works

  1. Upload your image: Add your image to MiniPx. It accepts JPEG, PNG, WebP, HEIC, BMP, TIFF, SVG, and GIF formats.
  2. View dimensions and file size: MiniPx displays the pixel width, height, and file size immediately after upload.
  3. Calculate your print DPI: Divide the pixel dimension by the intended print size in inches. For example, 3000 pixels / 10 inches = 300 DPI.
  4. Resize if needed: If you need to adjust the image for specific print or web requirements, set the max width and compression preset in MiniPx.

Frequently asked questions

What DPI do I need for printing?
300 DPI is the standard for professional printing — books, magazines, business cards, and photo prints. Large format prints (posters, banners) viewed from several feet away can use 150 DPI. Billboards use as low as 30-50 DPI because they are viewed from far away.
How do I check the DPI of an image?
Upload the image to MiniPx to see its pixel dimensions. To find the effective DPI, divide the pixel width by the intended print width in inches. For example, a 3000-pixel-wide photo printed at 10 inches = 300 DPI. Most image editing software also shows DPI in the image properties or metadata.
Does changing DPI change the image quality?
Changing the DPI metadata alone does not change image quality — it is just a tag that tells printers how to interpret the pixel data. What matters is the actual pixel count. A 3000x2000 image is the same image whether tagged 72 DPI or 300 DPI. Only adding or removing actual pixels changes quality.
What is the difference between DPI and PPI?
DPI (dots per inch) technically refers to printer output — how many ink dots per inch the printer places on paper. PPI (pixels per inch) refers to screen or image resolution. In practice, most people use DPI for both contexts, and that is fine — printers and design software understand what you mean.
Why do most digital images say 72 DPI?
When Apple created the original Macintosh in 1984, its screen displayed 72 pixels per inch. This became the default DPI tag for digital images. Modern screens display at 100-220+ PPI, but 72 DPI stuck as a default metadata value. For screen display, the DPI tag is irrelevant — only pixel dimensions matter.
How many pixels do I need for a 300 DPI print?
Multiply the print size in inches by 300. A 4x6 inch print needs 1200x1800 pixels. An 8x10 needs 2400x3000. An A4 page (8.27x11.69 inches) needs 2481x3507 pixels. Most modern phone cameras produce enough pixels for prints up to 13x10 inches at 300 DPI.
Can I increase the DPI of an image?
You can change the DPI metadata tag, but that does not add detail. To truly increase effective DPI, you need more pixels — which means either capturing at higher resolution or using AI upscaling (which guesses at detail that was not captured). The best approach is always to start with enough pixels for your intended use.
What DPI do government forms require?
Most Indian government exam portals (UPSC, SSC, IBPS) require 200+ DPI. Visa applications for the US, UK, and Schengen typically require 300 DPI. These portals check actual pixel dimensions, so make sure your image has enough pixels — not just the right DPI metadata tag.

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