Check an image's dimensions and format before uploading

A form rejects your image and you don't know why. Check the real dimensions, format, file size, and aspect ratio in one click.

Tools used in this guide

The job

An upload form demands "JPEG under 2 MB, at least 1200 px wide" and you don't know whether your file qualifies. Or a client asks for the exact pixel dimensions and you don't want to open an editor just to look.

Worked example

Drop a photo named IMG_2041.jpg: the tool reports 4032 × 3024 px, JPG, 3.1 MB, 4:3 aspect (1.333:1). Now you know it needs resizing before it fits a 2 MB limit — the resizer or compressor tools handle that next step.

The aspect ratio is shown simplified (16:9, 4:3, 1:1…) plus as a decimal, which is what many crop tools and specs actually ask for.

PNG, JPG, and WebP up to 25 MiB. Other formats (GIF, HEIC, TIFF) cannot be decoded here.
The format shown is detected from the file bytes, not the extension — a .jpg that is really PNG inside is reported correctly.

What it does not show

EXIF metadata — camera model, location, timestamps — is deliberately not read or displayed. To check or remove that data, use the metadata remover. The image is decoded in the page itself; nothing is uploaded.