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Image DPI Changer

Set an image to 300 DPI, or any density a printer asks for.

Image Tools Reviews Free · no sign-up

Drop an image here, or click to choose one

JPEG or PNG · the density field is rewritten inside the file, on your device

Quick Tool Overview

The Image DPI Changer rewrites the density field inside a JPEG or PNG — the number a print shop or journal submission system reads when it insists on 300 DPI. You can relabel the file without touching a pixel, which is what a submission check wants, or resample so the physical size is preserved at the new density. The print size is shown for both choices.

What it does
Changes the DPI metadata stored in an image
You give it
A JPEG or PNG and a target density
You get back
The same image tagged at the new DPI
Best for
Print shops and submission systems that check DPI
Image Tools Free, unlimited use No sign-up Runs in your browser

About the Image DPI Changer

Some print shops and journal submission systems check the DPI field inside the file and reject anything below 300, even when the pixel dimensions are more than adequate. That field is metadata, and this tool rewrites it.

Two things can happen here and it is worth being clear about which you want. Changing the DPI tag alone leaves every pixel exactly as it was and simply relabels the intended print size — that is what satisfies a submission check. Resampling instead changes the actual pixel count so the physical size stays the same at the new density. The tool does either, and shows the resulting print size in centimetres and inches both ways so the choice is obvious.

Key features of the Image DPI Changer

Writes real metadata

The JFIF density pair in a JPEG and the pHYs chunk in a PNG are both written correctly, not just displayed.

Relabel or resample

Change the tag alone to satisfy a checker, or resample the pixels to hold the physical size at the new density.

Print size shown live

The resulting size in centimetres and inches updates as you change the DPI, so the effect is never abstract.

The usual densities preset

72, 150, 300 and 600 are one click, and any other value can be typed.

Honest about what DPI is

The tool shows the pixel count alongside, because relabelling a small image as 300 DPI does not add detail to it.

How to use the Image DPI Changer

  1. 1

    Load the file

    Drop in the JPEG or PNG whose density needs changing. The current DPI is read from the file.

  2. 2

    Pick the new density

    Choose 72, 150, 300 or 600, or type any value the printer has specified.

  3. 3

    Decide whether to resample

    Leave it off to relabel only, or turn it on to keep the physical size and change the pixels.

  4. 4

    Download the file

    The new density is written into the file header and the print size is shown.

Frequently asked questions

No. On its own it changes only a number in the file header describing the intended print size. Quality comes from pixel count; a 500 by 500 image relabelled to 300 DPI still has 500 by 500 pixels of detail.

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