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Image DPI Converter

Change Image DPI Without Changing a Single Pixel

Set PNG and JPEG files to 72, 150, 300, 600 or any DPI by rewriting only the resolution tag, then see the print size in inches, cm and mm.

Files

No files
Drop PNG or JPEG files here
or tap to browse. Batches welcome. Files stay on your device.

    Nothing is re-encoded. After you apply, each file is decoded before and after, and the card compares the two pixel hashes.

    Pixels to inches, cm and mm at any DPI

    Print size from pixels

    10.00 × 10.00 in25.40 × 25.40 cm254.0 × 254.0 mm

    Pixels needed for a print size

    2,400 × 3,000 pxfor 8 × 10 in at 300 DPI, rounded to the nearest pixel

    Related tools

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    How to Change Image DPI Without Resampling

    The DPI stored in an image is one number that tells print software how many pixels to place in each inch of paper. Changing it adds and removes nothing; only the print size changes. A 3000 × 3000 px logo prints at 10 × 10 in at 300 DPI, or 41.7 × 41.7 in at 72 DPI.

    Step by step

    1. Drop PNG or JPEG files. Each card shows the pixels, the DPI in every field and the print size.
    2. Pick 300 for commercial print, or type your printer's value.
    3. Apply. The resolution fields are rewritten, then old and new files are decoded and their pixel hashes compared.
    4. Download the file, or a ZIP for a batch.

    When a new DPI is not enough

    If the print size at 300 DPI is too small, the file is short of pixels and no DPI value fixes that. Find the pixels needed with the calculator above, then use a vector original or export a bigger canvas with the homepage tool. For SVG artwork, render the SVG to PNG at print size; for T-shirts, the shirt logo placement calculator gives the print width.

    On websites and social networks the DPI field has no effect; here is why screens ignore the DPI field.

    Frequently asked questions

    Does changing the DPI reduce image quality?

    No. Only the resolution numbers in the file header change. The compressed image data is copied byte for byte, and the tool compares SHA-256 hashes of the decoded pixels before and after.

    Why does my print shop say my image is 72 DPI?

    Many exports and screenshots store 72 DPI or nothing, and software then assumes 72 or 96. If the file has enough pixels, set 300 DPI here. If it does not, you need more pixels, not a new DPI number.

    Why do two apps show a different DPI for the same JPEG?

    A JPEG can store resolution in JFIF, EXIF, a Photoshop block and XMP, and apps read different ones first. This tool writes the same value to every field it finds.

    How many pixels do I need for a 300 DPI print?

    Multiply each side in inches by 300: an 8 × 10 in print needs 2400 × 3000 px, and A4 (210 × 297 mm) needs 2480 × 3508 px.

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    DPI targets and the pixels each print size needs

    Printers quote resolution at the final printed size: 300 DPI for anything held in the hand, less for large prints seen from a distance. Pixels below are rounded to the nearest whole pixel.

    PrintSizePixels at 300 DPIPixels at 150 DPI
    Business card (US)3.5 × 2 in1050 × 600525 × 300
    Photo print4 × 6 in1200 × 1800600 × 900
    Photo print5 × 7 in1500 × 2100750 × 1050
    Frame or flyer8 × 10 in2400 × 30001200 × 1500
    US Letter page8.5 × 11 in2550 × 33001275 × 1650
    A4 page210 × 297 mm2480 × 35081240 × 1754
    A3 page297 × 420 mm3508 × 49611754 × 2480
    Full-front shirt print12 × 12 in3600 × 36001800 × 1800
    Poster18 × 24 in5400 × 72002700 × 3600

    DPI and PPI are the same field

    Strictly, PPI (pixels per inch) describes the file and DPI (dots per inch) a printer's ink dots, but software uses both names for the one stored value this tool writes.

    How each format stores it

    Choosing a value

    Use 300 for cards, brochures, packaging and most shirt transfers, 150 for office prints and distant posters, and 600 to 1200 for one-color line art such as stamps. If your printer names a figure, use theirs.

    Related guides

    How to Resize a Logo Without Losing QualityThe source-file hierarchy, the math behind sharp exports, and a step-by-step resize method that avoids blur, stretching and halos.PNG vs WebP vs JPEG for Logos: Which Format Should You Use?Our test of one logo in seven encodings: real file sizes, zoomed edge artefacts, transparency support and a format decision table.Build a Complete Logo Asset Kit in One BatchEvery logo file a small business needs, the folder structure agencies use, naming conventions and a batch workflow to export the lot at once.