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Resize image in cm or mm

Type the size a form gives in centimetres or millimetres, pick the DPI, and get an image at the exact pixel dimensions – with an optional KB cap for signature and photo boxes.

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    Resize an image in centimetres or millimetres

    Paper forms think in centimetres; screens think in pixels. This tool converts between the two: set the size in cm, mm or inches, choose the DPI (300 unless the form says otherwise), and the exact pixel dimensions are calculated and applied. It is made for the signature boxes and photo boxes on Indian, Pakistani and Bangladeshi application forms – “6 cm × 2 cm”, “3.5 cm × 4.5 cm”, “3.5 × 1.5 cm” – and for print sizes like 10 × 15 cm.

    Common sizes in pixels

    SizeUsed forAt 300 DPIAt 200 DPIAt 96 DPI
    6 × 2 cmSignature on exam forms709 × 236472 × 157227 × 76
    3.5 × 4.5 cmPassport / visa photo413 × 531276 × 354132 × 170
    3.5 × 1.5 cmSmall signature box413 × 177276 × 118132 × 57
    2 × 2 inUS passport photo600 × 600400 × 400192 × 192
    10 × 15 cmStandard photo print1181 × 1772787 × 1181378 × 567
    21 × 29.7 cmA4 page2480 × 35081654 × 2339794 × 1123

    Steps

    1. Add the image. Scan or photograph the signature or photo on a white background.
    2. Enter the size in cm or mm. Pick the unit, type width and height, or click a preset. The pixel result is shown underneath.
    3. Set the DPI. Keep 300 unless the form says a different value. The same cm size at a lower DPI gives fewer pixels and a smaller file.
    4. Add the KB limit if there is one. Signature boxes typically allow 10–20 KB, photos 20–50 KB.
    5. Resize. The file downloads at the exact pixel size. Check the thumbnail for cropping.
    For a photo with a specific country format, the passport size photo maker has presets and the right KB limits. For plain pixel sizes use 300 × 300, 600 × 600 or the general resizer.

    Frequently asked questions

    How many pixels is 6 cm × 2 cm?

    It depends on the resolution. At 300 DPI, 6 × 2 cm is 709 × 236 pixels; at 200 DPI it is 472 × 157; at 96 DPI, 227 × 76. The tool shows the pixel size as you type. If a form gives both cm and pixels, enter the pixels directly.

    How do I resize an image in cm for a form?

    Switch the unit to cm, type the width and height from the form, keep 300 DPI unless told otherwise, and press Resize. Add a KB limit if the form has one – signature boxes usually do.

    Which DPI should I use?

    300 DPI for anything that will be printed and for most government forms that quote cm or mm. 96 or 72 DPI only when the form explicitly says so, or for on-screen use.

    What is a 3.5 × 4.5 cm photo?

    The standard passport/visa photo size used in India, Pakistan, the EU and many other countries, equal to 35 × 45 mm or 413 × 531 pixels at 300 DPI. The passport photo maker has country presets for it.

    Is my image uploaded?

    No. The resize runs in your browser.