PNG DPI converter

Change PNG DPI metadata in the browser

Add or replace PNG density metadata for screenshots, transparent graphics, exported artwork, and flat images. The converter writes a pHYs chunk so apps can read the intended DPI value.

Convert PNG DPI Need JPG instead?

PNG DPI

How PNG stores DPI

PNG does not store DPI in the same way as JPEG EXIF. It can store physical pixel density in a pHYs chunk. When the unit is meters, software can translate pixels per meter into DPI.

This converter adds or replaces that pHYs data with the selected target value, such as 300 DPI.

How to change PNG DPI

  1. Open the main tool and upload a .png file.
  2. Check whether the PNG already has pHYs density metadata.
  3. Choose a target DPI value, usually 300 for print workflows.
  4. Download the rewritten PNG and verify the density in your design app.

Pixels and transparency stay intact

Metadata-only PNG conversion does not flatten the image, change the canvas size, or remove transparency. It changes the density metadata that compatible apps use to calculate physical size.

Common PNG DPI use cases

  • Transparent logos that need a 300 DPI tag for layout software.
  • Digital artwork exported as PNG but submitted to a print workflow.
  • Screenshots or UI captures that need predictable physical dimensions in a document.
  • Flat illustrations where lossless pixels matter more than JPEG compression.

Related tools

Check and calculate PNG output

Checker Image DPI Checker See whether your PNG already has a density tag. 300 DPI Convert Image to 300 DPI Use the common print target. Print size 300 DPI Print Size Calculator Calculate the physical size from PNG pixels.