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Change Image DPI – 72, 150, 300 or 600 DPI

Set a JPG to 300 DPI or another common print density without changing its pixel width or height. ToolNova updates the JPEG density metadata and downloads a new JPG.

Click to upload or drag and drop a JPG photo here

Upload a JPG to see pixel dimensions and estimated print size at the selected DPI.

This sets the DPI (density) metadata a print shop or printer reads for physical print size — it does not resample or change the pixel dimensions of your photo.

How to use the image dpi converter

  1. Upload a JPG photo.
  2. Choose a target DPI — 300 is standard for print, 72 for screen use.
  3. Click Set DPI, then download.

DPI vs pixel dimensions

Changing DPI updates the print-density metadata stored in the JPG; it does not add pixels or improve the underlying image detail. If a form requires a different width or height in pixels, use the Image Resizer instead.

Features

  • Patches the JPEG density metadata for 72, 150, 300 or 600 DPI
  • Doesn't resize pixel dimensions, so the image keeps the same width and height in pixels
  • Shows estimated physical print size in inches and centimetres
  • Runs in your browser; the JPG is not uploaded to ToolNova

What does 300 DPI mean for print size?

DPI controls how densely image pixels are placed on paper; it does not create new pixels. A 1200 × 1800 pixel photo at 300 DPI corresponds to about 4 × 6 inches, while a 2400 × 3000 pixel photo corresponds to about 8 × 10 inches at 300 DPI.

Pixel dimensionsAt 300 DPIAt 150 DPI
1200 × 1800 px4 × 6 in8 × 12 in
2400 × 3000 px8 × 10 in16 × 20 in

If a service requires both a specific DPI and specific pixel dimensions, use the Image Resizer first, then set the DPI here.

Frequently asked questions

No — DPI only tells a printer how many pixels to fit per inch when printing; it doesn't add or remove pixel detail. For a genuinely larger or sharper image, resample the actual dimensions instead using the Image Resizer.

300 DPI is the long-standing standard for print quality that looks sharp to the naked eye at normal viewing distance; some labs and photo ID systems check this metadata field specifically, even though the same pixels could print fine at other DPI values.

This tool works on JPG files, since DPI is stored in the JFIF header specific to JPEG. For PNG, convert to JPG first using the JPG to PNG / PNG to JPG tools.

Related tools

DPI metadata does not create new detail

Changing a DPI value can alter how software interprets print size, but it does not magically add photographic detail. Pixel dimensions are what determine the amount of image information available.

  • Check both pixel dimensions and the requested DPI for print submissions.
  • Do not upscale only to make a DPI number look higher.
  • For a fixed print size, calculate whether the original pixel dimensions are sufficient before changing metadata.

Related reading: JPG, PNG, WebP and HEIC: choosing an image format