Image DPI checker

Use this DPI checker to read the resolution saved in JPEG, PNG, WebP, HEIC and AVIF files and see their print size. Save a JPEG or PNG copy with a new DPI.

Free, no sign-up. Your images never leave your browser.

Choose images

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JPEG, PNG, WebP, HEIC and AVIF. Up to 20 files, 100 MiB each. Files are read in your browser and never uploaded.

Applies to JPEG and PNG copies. Only the DPI header changes: the pixels, quality and on-screen size stay the same.

What DPI changes

DPI tells a printer how many pixels to place in each inch. It adds no detail and does not change how the image looks on screen. To print larger at the same DPI, you need more pixels.

DPI and print size

Choose images to see their stated DPI, pixel size and print size.

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    DPI is the number of pixels a printer places in each inch. This tool reads the DPI stored in the JFIF, EXIF, Photoshop and PNG headers, flags values that disagree and shows the print size at 300, 150 and 72 DPI. It can write a new DPI into a JPEG or PNG copy. Files stay in your browser.

    How to use this tool

    Choose images
    Select up to 20 JPEG, PNG, WebP, HEIC or AVIF files, up to 100 MiB each. The browser reads the file headers directly. Nothing is uploaded and the pictures are not decoded, so HEIC works even in a browser that cannot display it.
    Read every header
    A JPEG can hold a DPI in its JFIF header, in the EXIF resolution tags and in a Photoshop block. A PNG uses the pHYs chunk and sometimes EXIF. Each value is listed with its unit, with a warning when they disagree. Print size is the pixel count divided by the DPI.
    Write a new DPI
    Enter a whole number from 1 to 65535 and download a JPEG or PNG copy. The tool updates the JFIF header (adding one if it is missing), existing EXIF and Photoshop values, or the PNG pHYs chunk, and copies the image data byte for byte. WebP, HEIC and AVIF are read only.

    PNG specification: physical pixel dimensions

    Questions before you start

    No. DPI is a printing instruction stored next to the pixels. A 3000 by 2000 pixel photo has the same detail at 72 or 300 DPI and looks the same on screen. Only the print size changes: 10 by 6.67 inches at 300 DPI, or 20 by 13.33 inches at 150 DPI. More detail needs more pixels.

    A JPEG can store its DPI in up to three places, and programs do not all read the same one. A file marked 72 DPI in the JFIF header and 300 DPI in EXIF can show either value. This tool lists each one and flags the conflict, and the downloaded copy carries the same value in every header it updates.

    No. This page checks image files. Mouse DPI describes how many steps the sensor reports for each inch the mouse moves, and you change it in the mouse software or the system settings.

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