# Image DPI Changer

Change the DPI recorded in an image without touching its pixels. Choose a value from 1 to 2400 dots per inch, for example 300 for print or 72 for screens, and the tool writes it to the JPEG, PNG, TIFF, WebP or AVIF file while keeping its other metadata. Useful for print shops, publishers and forms that ask for a specific resolution setting.

## Frequently asked questions

### Does changing the DPI resize my image?

No. The pixel width and height stay exactly the same. Only the resolution value stored in the file changes, which tells printers and layout apps how large to print the image.

### How does DPI relate to print size?

Print size in inches is the pixel size divided by the DPI. A 3000 by 2400 pixel photo prints at 10 by 8 inches at 300 DPI and at about 41.7 by 33.3 inches at 72 DPI. Raising the DPI makes the print smaller and sharper, it never adds detail.

### Which DPI value should I use?

300 DPI is the usual requirement for photo prints and offset printing, 150 to 200 DPI is enough for large posters viewed from a distance, and 72 or 96 DPI is common for screens, where the value has no visible effect. The tool accepts whole numbers from 1 to 2400 and uses 300 by default.

### Where is the DPI stored?

JPEG files store it in the JFIF header and EXIF resolution tags, PNG files in the pHYs chunk and TIFF files in their resolution tags. WebP and AVIF have no native resolution field, so the value goes into EXIF, which some apps ignore.

### Which formats are supported?

JPEG, PNG, TIFF, WebP and AVIF files up to 5 MB and 4000 pixels a side. GIF has no place to record a resolution, so GIF uploads are rejected with a message.

### Is the rest of my metadata kept?

Yes. EXIF, XMP and the ICC color profile are kept, and only the resolution values are updated.

### Does the image lose quality?

The file is written again with the new value. PNG and TIFF stay lossless, JPEG is saved at quality 92 with the original chroma subsampling, WebP at quality 92 and AVIF at quality 80.

### Why does a form reject my image as low resolution?

Some upload forms only read the DPI value, so a photo saved at 72 DPI fails even when it has plenty of pixels. Setting the value to what the form expects fixes that. If the form checks pixel dimensions instead, resize the image with the Image Resize tool.

### What is the difference between DPI and PPI?

PPI means pixels per inch in a digital image, while DPI strictly means printer dots per inch. Image files and most apps use the terms interchangeably, and the stored value is the same field either way.

### How do I check the new DPI?

Upload the result to the Image Info tool, which reports the stored density. For JPEG, PNG and TIFF it is also shown by most image viewers and layout apps.

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