↑↓ to move · Enter to open · Esc to close

Change Image DPI

Change image DPI to 300, 72, or any value without touching a single pixel, and see how big the image will print. Works for JPG and PNG files, one at a time or in batches.

Updated
Your files are processed in your browser and never uploaded.

Your images

JPG or PNG. Up to 20 images, 50 MB each. Ctrl+V pastes.

    Settings

    Only the DPI number stored in the file changes. The pixels, width, and height stay exactly the same.

    Preview

    Your preview will appear here
    1. Choose or drop images on the left
    2. Pick the new DPI
    3. Check the print size, then download

    How to change the DPI of an image

    1. Add JPG or PNG files.
    2. Pick a DPI from the list, or choose Custom and type any whole number from 1 to 65,535.
    3. Check the DPI before and the print size at the new DPI under each file.
    4. Download the files. The name ends with the new DPI, for example photo-300dpi.jpg.

    How it works

    DPI is just a number stored in the file. It tells printing software how many pixels to put in each inch of paper:

    print width (inches) = width in pixels ÷ DPI
    print width (cm) = print width (inches) × 2.54

    • JPG: the density fields in the JFIF header are set, and the XResolution and YResolution values in EXIF are updated when the file has them, so every app reads the same number.
    • PNG: the pHYs chunk stores pixels per meter, which is DPI ÷ 0.0254, rounded.

    No pixel is resampled, so the width, height, and image data stay exactly the same.

    Examples

    • A 3000 px wide image at 300 DPI prints 10 in (25.4 cm) wide.
    • An 1800 × 1200 photo at 300 DPI prints at 6 × 4 in, the standard photo print size.
    • The 1600 × 1067 sample photo is stored at 72 DPI, which means 22.22 × 14.82 in. At 300 DPI it prints at 5.33 × 3.56 in with the same pixels.

    Which DPI should I use?

    DPITypical use
    72 or 96Screens (ignored by browsers)
    150Draft prints, large posters seen from a distance
    300Photo prints, flyers, most print shops
    600Line art and text scanned for print

    Screens ignore DPI. A 1200 px wide image looks the same on a website whether the file says 72 or 300.

    Limitations

    • Only JPG and PNG. WebP and AVIF have no standard DPI field.
    • Changing the DPI does not add detail. For a larger print at 300 DPI you need more pixels, which only a bigger original can give.
    • Some apps ignore the stored DPI and use their own print size settings.

    Frequently asked questions

    Does changing DPI change image quality?

    No. Only the number stored in the file changes. The pixels, width, and height are exactly the same, so the image looks identical on screen.

    What DPI do I need for printing?

    300 DPI is the usual target for photos and flyers. Divide the pixel width by 300 to get the largest sharp print width in inches.

    Why do many images say 72 DPI?

    It is an old default from early Mac screens that many apps still write. It does not affect how the image looks on screen, only the size a printer assumes.

    What is the difference between DPI and PPI?

    PPI (pixels per inch) describes images and screens; DPI (dots per inch) comes from printers. The number stored in image files is really PPI, but almost everyone calls it DPI.

    Often used together with the Image DPI Converter.

    • Image Resizer

      Resizes images to exact pixels or a percentage, one at a time or in batches.