Image DPI changer

Read or rewrite the DPI tag stored in a JPEG or PNG — the print-size hint, without touching a single pixel.

DPI is a print-size hint stored in the file's metadata. It does not change the pixels — a 300 DPI tag on a small image does not add detail.

JPEG (JFIF density) and PNG (pHYs chunk), up to 25 MiB. Other formats, EXIF DPI variants, and animated files are not supported.

The file stays in this browser. Only the DPI tag is rewritten — pixels are copied byte for byte.

How to use

  1. Choose a JPEG or PNG.
  2. Read the stored DPI (if any).
  3. Enter a new DPI and download the retagged file.

What it supports

JPEG (JFIF density fields) and PNG (pHYs chunk), 1–4800 DPI, files ≤ 25 MiB. EXIF-based DPI, WebP, and other formats are not touched. DPI changes print size on paper — it adds no pixels and no detail.

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