Check image dimensions in pixels, cm and inches

Add your image, and the table shows its print size in cm, worked out from the file's own DPI. To see mm or inches instead, use the unit switch above the table. Every row updates at once.

DPI is the number saved in the file that says how many pixels fit in one inch. Each row uses its own file's DPI, so a phone photo and a scan each get the right size. If a file has no DPI saved, pick one with "Size at" to see its print size.

The math works like this:

• Inches = pixels ÷ DPI
• cm = pixels ÷ DPI × 2.54
• mm = pixels ÷ DPI × 25.4

For example, a 2400 × 1600 px image saved at 300 DPI is 8 × 5.33 inches. In metric, that's 20.32 × 13.55 cm, or 203.2 × 135.5 mm.

Each size is worked out from the exact pixel count and rounded only at the end. Centimeters and inches show 2 decimal places, and millimeters show 1.

Is the image too big or too small for the job? Resize it to new pixel dimensions, then add it here again to check the new print size.

Add the image and look at its DPI column. It shows the DPI saved in the file, such as 72, 96 or 300, and which part of the file it came from.

Images store their DPI in different places, and the tool reads each one:

• JPG: the JFIF header and the EXIF data, whether the value is saved per inch or per centimeter
• PNG: the resolution field, saved in pixels per meter and converted to DPI
• BMP and TIFF: the resolution in the file header
• WebP, HEIC and AVIF: the EXIF data, when the file has it

Need a different DPI, like 300 for print? Change the DPI without touching the pixels. The image looks the same on screen, and only its print size changes.

What "No DPI saved" means

It means the file doesn't store a DPI at all. GIF files have no place for one, and many apps leave it out when they save or share an image. The tool says so plainly instead of guessing a number.

Without a DPI, a pixel has no physical size, so there's no true size in cm to show. Some apps fill in 72 or 96 DPI here. That's why the same image can show different print sizes in different apps.

To see a print size anyway, set "Size at" to 72, 150, 300 or a custom DPI. Every row then shows the size it would print at with that DPI.

Why a JPG can show two DPI values

A JPG can store its DPI in two places, and the two don't always match. One file might say 300 in its JFIF header and 72 in its EXIF data. When that happens, the tool shows both values with the note "Apps may show either".

That explains why one app reports 72 DPI and another reports 300 for the same file. It usually happens when an app updates one value and leaves the other as it was.

A higher DPI makes the same image print smaller, and a lower DPI makes it print bigger. The pixels don't change. DPI only decides how many of them go into each inch of paper.

Take an image 3000 px wide. At 300 DPI it prints 10 inches (25.4 cm) wide. At 150 DPI, the same file prints 20 inches (50.8 cm) wide, and each pixel is twice as wide on paper.

A bigger print from the same pixels looks softer up close, because each pixel covers more paper. That's why print shops often ask for 300 DPI at the size you plan to print.

See the print size at another DPI

Use "Size at" above the table to try a different DPI on every image at once:

• File's DPI: each image uses its own saved DPI. This is the default.
• 72, 150 or 300: one DPI for every row
• Custom: any DPI from 1 to 9,999

"Size at" doesn't change your files. It only shows the size each image would print at with that DPI, so you can compare it with the paper or frame you have in mind.

An image size checker reads an image file and tells you how big it is. This one shows the size in pixels, the DPI and the print size, and it checks up to 100 images in one table. It's free, with no sign-up.

• Works in the browser on phones, tablets and computers, with no app to install
• Reads JPG, PNG, WebP, GIF, BMP, AVIF, TIFF, HEIC and HEIF files
• Shows width × height in px, aspect ratio, megapixels, DPI, print size and file size for each image
• Add more images at any time, remove one, or clear the list
• Copy one row, or copy all rows as tab-separated text that pastes into a spreadsheet

The size is read from the data stored inside each file, without opening the whole image. So even a very large photo shows its size right away.

Your photos stay on your device and are never uploaded.

Phone photos: rotated shots and iPhone HEIC

Phones often save a portrait photo on its side, with a tag that tells apps to turn it upright. That's why one app can say 4032 × 3024 and another 3024 × 4032 for the same photo.

This tool always shows the size you see, width first. The row also says "Rotated by the camera" and gives the size as it's stored, so both numbers make sense.

iPhone photos in HEIC or HEIF format work too, even in browsers that can't display them. You get the size and DPI as usual, with a format icon in place of the thumbnail.