Image Dimensions Checker

What it reports

It does not read DPI or print size, colour profiles, EXIF or camera data. For colour profiles use the Image Color Profile Checker, and to remove camera data, the Image Metadata Remover. Those two upload the file to our server; this page does not.

Phone photos are reported the way they display

Many phone photos are stored sideways with a flag saying how to turn them. We loaded a JPG stored at 600 × 400 with a "turn clockwise" flag in Chrome, and the checker reported 400 × 600, the upright size you see in a viewer. A program that ignores the flag would report 600 × 400, so the numbers can differ between tools for the same file. The result depends on the browser, so if exact stored pixels matter, check with the program you are comparing against.

When there are no dimensions

Dimensions need a browser that can decode the format. In our Chrome test a TIFF showed its format and file size but dashes for width, height and ratio, and HEIC is often in the same position, since browser support for it varies. A file that is not an image, such as a .dat file with a JPG inside, is refused with "This does not look like an image file" because the browser reports its type from the name. For TIFF and HEIC files, converting with TIFF to JPG or HEIC to JPG gives you something you can measure. An animated GIF is reported at its canvas size.

What to do next

If the picture is too big, use the Image Resizer. If its proportions are wrong, use the Image Cropper to cut it to the ratio you need. A phone photo that shows a different size here than in your editor is usually a rotation flag; the Image Rotator applies it for real.

Any image your browser can display, typically JPG, PNG, WebP, GIF, BMP and SVG, and AVIF in recent browsers. Formats the browser cannot decode, such as TIFF and HEIC in most desktop browsers, still show their format and file size but not the dimensions. There is no size limit from our server because the file never reaches it; very large images are limited by your browser's memory.

1. Choose an image, or drag one onto the box. No upload happens.
2. Read the width, height, aspect ratio and format that appear, and the file size beneath them.
3. Choose another file to check it, or clear the result to start again.

• Checking that a photo meets a site's minimum or exact pixel size before uploading
• Finding the aspect ratio before you crop or resize
• Telling a 4000-pixel original from a downsized copy
• Confirming a file's real size on disk

Reports only pixel dimensions, ratio, format and size on disk. It does not show DPI, colour profile or EXIF data. Whether a rotated phone photo reports its stored or its upright size depends on the browser; Chrome reported the upright size. The format name comes from the file type your browser reports, so a mislabelled file can be named wrongly. One file at a time.