What this tool tells you
Upload forms, print shops and website themes all have size requirements, and the file name rarely tells you whether an image meets them. This tool reads each image locally and shows:
- Width × height in pixels, the image’s real resolution
- Aspect ratio, such as 4:3, 16:9 or 1:1
- Megapixels, width times height divided by one million
- File size on disk
- DPI, when the file stores a value
- EXIF summary: camera model, date taken, and whether GPS location is embedded
You can add up to 50 images at once to compare them side by side, for example to find which photos in a set are large enough for a print.
Pixels, file size and DPI are different things
These three numbers are often confused.
Pixel dimensions describe how much detail an image holds. A 4000 × 3000 photo has 12 million pixels, no matter how it is saved.
File size depends on dimensions, format and compression. The same 12-megapixel photo might be 3 MB as a JPG, 25 MB as a PNG, and under 2 MB as WebP or AVIF.
DPI (dots per inch) is only a note inside the file telling software how large to print it. Changing DPI from 72 to 300 doesn’t add any detail; it only changes the suggested print size. Screens ignore it entirely.
Common size checks
| Use | What to look for |
|---|---|
| Sharp print | Pixels ÷ 300 = maximum print size in inches |
| Passport or visa photo upload | Exact pixel dimensions and file size limit set by the form |
| Website hero image | Width at least as wide as the layout, often 1920 px or more |
| Social media post | Aspect ratio the platform expects, such as 1:1 or 4:5 |
| Email attachment | File size, ideally well under a few MB |
If an image is too large in file size, compress it or convert it to a more efficient format. If it is too small in pixels, enlarging it won’t recover lost detail; find the original instead.
Checking for hidden location data
Phone cameras usually write GPS coordinates into every photo. That is useful in your own gallery, but if you post the original file online, anyone who downloads it can see where it was taken, sometimes down to the house.
The EXIF summary here tells you whether GPS location is present. It also shows the camera model and capture date, which helps when sorting photos or checking whether an image is really the original. Note that many social networks strip EXIF on upload, while email attachments, cloud links and messaging apps sent as “file” often keep it.
Why some values are missing
- No DPI: screenshots and most web images don’t store one.
- No EXIF: the image was edited, exported or downloaded from a site that removed metadata, or it is a format such as PNG or GIF that rarely carries camera data.
- Rotated dimensions: phone photos may store orientation as a flag, so width and height can look swapped compared with how the image appears in a viewer.