Image Dimensions Checker
Check an image's pixel size, megapixels, aspect ratio, and DPI at a glance — free and right in your browser.
Drop an image to inspect
Drag & drop, paste, or pick a file
JPG · PNG · WebP · HEIC · TIFF — read on your device
Width, height, megapixels, and DPI
The most basic facts about an image — how many pixels wide and tall it is, its megapixel count, and its aspect ratio — aren't always easy to find without opening an editor. This checker reads them instantly: drop an image and see its exact dimensions, resolution, and file size in one place.
It also reads the DPI (dots per inch) tag, which matters for printing. DPI has no effect on how an image looks on a screen — there, only pixel dimensions count — but it determines how large the image prints. The tool shows both, so you know what you're working with.
How to check image dimensions
- Open your image. Drag it onto the tool, choose a file, or paste it.
- Open the Size & DPI tab. See the width, height, megapixels, aspect ratio, DPI, and file size.
- Plan your print or resize. Use the print-size estimate, or send the image to our resize tool to change it.
DPI vs pixels — what matters when
For anything on screen — websites, social media, presentations — ignore DPI and look only at pixel dimensions. For printing, aim for around 300 DPI: a 3000 × 2000 px photo prints cleanly at about 10 × 7 inches.
Dimensions, megapixels, and DPI
An image's true size is its pixel dimensions — width × height. From those the tool derives the megapixel count and the aspect ratio. It also reads the resolution (DPI) tag, which is metadata that affects printing only, not on-screen display. This page reads the real pixels by decoding the image, so the figures are correct even when a file's stored dimension tags are missing or rotated.
What each size figure means
| Field | What it holds |
|---|---|
| Width × Height | The pixel dimensions and the only true measure of size, e.g. 4032 × 3024 px. |
| Megapixels | Width × height ÷ 1,000,000 — so 4032 × 3024 px is about 12.2 MP. |
| Aspect ratio | The simplified width-to-height ratio, e.g. 4:3 for 4032 × 3024, or 16:9 for a widescreen frame. |
| DPI (XResolution / YResolution) | A print-density tag, e.g. 72 or 300 DPI; many images store none, in which case 96 is assumed. |
| Print size | Pixel dimensions ÷ DPI — a 3000 × 2000 px photo at 300 DPI prints about 10 × 6.7 inches. |
DPI vs pixels — what matters when
For anything on a screen — websites, social media, slides — DPI is irrelevant; only pixel dimensions decide how big and sharp the image looks. DPI matters solely for print: it sets how many pixels are packed into each printed inch, and therefore how large the photo can print cleanly. Around 300 DPI is the usual target for quality prints.
From checking to resizing
This page reads the dimensions but doesn't change them. To actually change an image's pixel size, send it to the resize tool; to reduce its file size without changing dimensions, use compress. Reading the size, like reading metadata, leaves the original file exactly as it was.
More EXIF & metadata tools
Frequently asked questions
What's the difference between dimensions and DPI?
Dimensions are the pixel width and height — the true size of the image. DPI is a print-density tag that only affects how large the image prints, not how it looks on screen.
How many megapixels is my image?
Megapixels are width × height ÷ 1,000,000. The checker calculates it for you, so a 4000 × 3000 image is 12 MP.
Why does my image show 96 DPI or no DPI?
Many images don't store a DPI tag, so screens assume 96 DPI. That's fine — DPI only matters when you print.
Where is my image processed?
The metadata is read and removed in your browser, so the clean copy is created on your own device. How any data associated with the tool is handled is described in our privacy policy.
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