Image Dimensions Checker

What this tool does

The Image Dimensions Checker is an inspection-only tool that reads the pixel width, height, aspect ratio, megapixel count, file size and format of any number of image files in one go. Drop a batch of files onto the zone and the tool decodes each one in the browser, then populates a table row for every image. Nothing is re-encoded, modified or uploaded — the tool reads just enough to report the numbers, then stops. A Copy as list button lets you pull the whole table into a spreadsheet.

Why you might need it

Keeping track of image dimensions across a large asset library is repetitive work. Before uploading product photos to an e-commerce platform you often need to verify that every image meets a minimum pixel size — say 2000 × 2000 pixels for Amazon listings. Before handing a blog post to a developer you might need to confirm that every hero image is wide enough not to look blurry on a retina display. Before submitting images for print production the art director needs to know the resolution of every file in the batch.

Doing this one file at a time in an image editor is slow. Checking a folder of fifty product photos, social post variants or document scans in a single drop is much faster. The aspect ratio column immediately shows which images are portrait, landscape or square, and the megapixel column gives a quick sense of how much detail is available for cropping or enlargement.

How to use it

1. Drop one or more image files onto the drop zone, or click it to open a file picker with multi-select enabled.
2. The table populates with a row for each file showing name, dimensions, aspect ratio, megapixels, file size and format.
3. Drop more files at any time — new rows are appended to the existing table.
4. Click Copy as list to copy all rows to your clipboard in tab-separated format, ready to paste into a spreadsheet.
5. Click Clear all to empty the table and start fresh.

Common pitfalls

The tool reports the image’s stored pixel dimensions, not its print size. A 3000 × 2000 JPEG could be intended for a small business card or a large poster — the pixel count is the same either way. Use the Image DPI Changer to see or change the print resolution metadata separately.

Animated GIFs report the dimensions of the first frame. The tool does not decode all frames, so it will not tell you the number of frames or the total animation duration. For video-like sequences of frames, a dedicated video tool is the right choice.

EXIF orientation metadata is respected by modern browsers, so if a JPEG was taken in portrait mode but stored in landscape with an EXIF rotation tag, the width and height reported are the logical (corrected) dimensions — the same ones you would see in an image viewer.

Tips for best results

When auditing images for a website, look for anything with a very large megapixel count — a 20 MP photo displayed at 400 × 300 pixels on screen is wasted data. Check those candidates with the image compressor and image resizer to bring file sizes down. Conversely, images with very low pixel counts (under 0.5 MP for a large hero slot) may look blurry and need replacement with a higher-resolution original.

The tab-separated output from Copy as list imports cleanly into Google Sheets using Paste special → Tab-delimited text, and into Excel with a standard Paste. Once in a spreadsheet you can sort by megapixels, filter by format, or add formulas to flag any file that falls below your minimum size requirements.