What you get for each image
For every file you open, a card shows:
| Field | What it means |
|---|---|
| Dimensions | width × height in pixels, as the image is displayed |
| File size | in KB or MB, plus the exact number of bytes |
| Format | detected from the file’s content (JPEG, PNG, WebP, GIF, BMP, AVIF, HEIC, SVG) — with a warning if the extension says something else |
| Aspect ratio | the simplified ratio (for example 4:3) and the nearest common ratio when it is not a standard one |
| Orientation | landscape, portrait or square |
| Megapixels | width × height ÷ 1,000,000 |
| Print size | how many inches the image covers at 300 DPI (sharp photo print) and at 150 DPI (acceptable for large posters seen from afar) |
A 4032 × 3024 photo from a phone, for example, is 12.19 megapixels, has a 4:3 ratio and prints sharply up to 13.44 × 10.08 inches.
Pixels, megapixels and DPI
An image file has no physical size, only pixels. DPI (dots per inch) is the link between the two: printed at 300 DPI, every inch of paper uses 300 pixels, so the print width in inches is the pixel width divided by 300. That is why a 1080 × 1080 Instagram image only makes a sharp 3.6-inch print. The guide What is DPI for printing? explains which DPI each kind of print needs. For a size-by-size table of standard prints with the DPI your photo reaches, and to crop it to 4×6, 5×7 or 8×10, use Photo Print Size.
Megapixels are a quick way to compare images: doubling the megapixels does not double the width — it multiplies each side by about 1.41. The DPI value stored inside a file (often 72 or 96) does not change any of this: it is only a hint for print software, and the number of pixels is what decides how large the image can be printed or displayed.
Why sizes matter when you upload
Websites, job portals and government forms often require minimum or maximum dimensions, a file size limit (for example “under 2 MB”) or a specific ratio. Check the image here first, then:
- if the ratio is wrong, find the right width or height with the Aspect Ratio Calculator;
- if the file is too heavy, reduce it with Compress Image;
- if the dimensions are too big for a social network, use the Social Media Image Resizer.
SVG files are a special case: they are vectors, so the size shown is their natural size from the file’s width, height or viewBox, and they can be rendered larger without losing sharpness.
Private by design
The images are read by your browser with the same decoders it uses to display pictures, plus a WebAssembly decoder for HEIC photos when the browser cannot read them on its own. Nothing is uploaded, no account is needed, and there are no tracking cookies.