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PixelFlow

Resize Image in cm and Inches

Set an image to an exact physical print size such as 3.5 x 4.5 cm or 2 x 2 inches at 300 DPI.

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Processed locally — never uploaded

Centimetres Millimetres Inches
72 - screen 150 - draft print 300 - standard print 600 - high quality print

Physical size is only a label. The pixel count is what determines print quality, so a small size at 300 DPI needs more pixels than the same size at 72.

How to use resize image in cm and inches

  1. 1
    Add your image

    Drop the file in. Its current pixel dimensions and effective DPI are shown.

  2. 2
    Enter the physical size

    Choose your unit, type the width and height, and pick the resolution you will print at. 300 DPI is the safe default.

  3. 3
    Check the warning, then download

    If the image lacks enough pixels for the target size and DPI, the panel tells you instead of quietly making it blurry.

About resize image in cm and inches

Resize image in cm sets a picture to an exact physical size for printing. A photograph does not physically measure anything on screen, so telling a printer or a website that your image is 3.5 by 4.5 centimetres means writing those physical dimensions into the file and getting the pixel count right for the resolution you are printing at.

The arithmetic is straightforward: width in centimetres divided by 2.54 gives inches, and inches multiplied by the DPI gives pixels. At 300 DPI a 3.5 x 4.5 cm image needs roughly 413 x 531 pixels, which is the standard a passport photo has to meet. This tool performs that conversion and shows you exactly which pixel dimensions it will produce.

Choosing the right DPI is where most people go wrong. 72 DPI is for screens and looks visibly blocky in print. 300 DPI is the standard for anything printed at ordinary viewing distance, and is what most photo labs and official forms expect. 600 DPI only makes sense for small sizes or close inspection, because it demands a great many more pixels for the same physical dimensions. If the image does not have enough pixels for the size and resolution you asked for, this tool warns you rather than quietly upscaling it into a soft, unusable file.

Frequently asked questions

What size does a passport photo need to be?

Most countries use 35 x 45 mm, which is 3.5 x 4.5 cm, with the head positioned within a specified range. Requirements vary, so check the issuing authority rather than assuming, and use the passport photo maker for the layout.

What DPI should I print at?

300 DPI for anything printed at normal viewing distance, which covers almost all photographs, documents and forms. 600 DPI only helps for very small prints or when the image is examined closely.

Why does my image look blurry when printed?

Almost always because the pixel count is too low for the physical size and resolution. A 3.5 x 4.5 cm print at 300 DPI needs roughly 413 x 531 pixels, and fewer than that will look soft.

What is the difference between physical size and pixel size?

Pixels are the real data. Physical size is written into the file as metadata that a printer reads. If the two do not match the resolution, the result is either soft or visibly pixelated.

Can I print larger than my image supports?

You can, but it will look soft unless you use an AI upscaler first. A photo taken at 4000 pixels can be printed to about 33 x 25 cm at 300 DPI before it visibly degrades.

Does this set the print size or just change the pixels?

Both. The pixels are resampled to the count your chosen size and DPI require, and the physical dimensions in millimetres are written into the file so printers pick them up.

Related tools

Passport Photo Maker Create a compliant ID or passport photo at 35x45mm, 600x600px or 2x2 inches, with a plain background. Resize Image Change image dimensions in pixels with the aspect ratio locked, so proportions stay correct. Image DPI Converter Check or change the DPI of an image and see the print size its resolution genuinely supports. Crop Image Crop a picture by dragging a selection, with aspect ratio presets for squares, 16:9 and 4:3. Compress to Exact Size Hit an exact file size target such as 50KB, 100KB or 500KB by adjusting quality and dimensions together. Page Size Converter See the pixel size and print size of standard paper formats, for A4, Letter, ID cards and social profiles. Bulk Image Resizer Resize a whole folder to one size by fitting or cropping, then download everything as a ZIP. Social Media Image Resizer Resize one image to Instagram, Facebook, TikTok, YouTube, X and LinkedIn sizes in a single pass.

Private by design. Your files are processed on this device and are never uploaded to the 1xmobcas.com server. Use resize image in cm and inches offline with total confidence.