Resize Image in CM

How to resize an image in cm

1. Open a photograph from your device, drag it onto the tool, or paste a copied image.
2. Pick a common size or type the width and height in centimetres. The first number is the width. Use Swap width and height if the measurements on your form are in the opposite order.
3. Select a DPI button or enter another resolution. The line beneath the controls shows the resulting pixel dimensions.
4. For a different aspect ratio, choose Crop to remove outer edges, Fit to leave white margins, or Stretch to change the proportions. Check that the preview includes everything you need.
5. Leave No limit selected for a size-only task, or choose a KB maximum or range if there is also a file size rule.
6. Save as JPG or PNG to include the DPI, then download the resized picture.

Centimetres, pixels and DPI

Centimetres describe a physical measurement; pixels describe the grid of an image. DPI connects them by giving the number of pixels per inch. For each side, the calculation is pixels = cm ÷ 2.54 × DPI. The answer is rounded to a whole pixel because a picture cannot contain a fraction of a pixel.

A 3.5 × 4.5 cm rectangle therefore needs 276 × 354 pixels at 200 DPI, or 413 × 531 pixels at 300 DPI. Both describe nearly the same physical rectangle, but the second contains more detail. Enlarging a small source cannot recover detail that was never captured.

Pixel dimensions alone do not tell a document editor how large to place a picture. The resolution stored inside the file supplies that information. This tool writes your chosen DPI into JPG and PNG downloads, alongside the resized pixels, so Word and print dialogs can calculate the intended centimetres.

Centimetre to pixel chart

These numbers are rounded to the nearest whole pixel, using the same conversion as the tool above.

Which DPI to use

72 and 96 DPI are common screen-related values. When a picture is viewed only on a screen, its DPI tag does not change the visible detail: the pixel dimensions matter. 150 DPI is useful for a draft print. 200 DPI appears in many scanning instructions; IBPS's scanning guidelines ask for at least 200 dpi.

300 DPI is a common choice for photo printing, so this page starts there. If a form or size table specifies a DPI, use that value instead. Choosing a higher number gives a larger pixel grid and usually a heavier file, rather than making every source image sharper.

Printing at the exact size

In the print dialog, select Actual size or 100%. Avoid Fit to page, which scales the picture to the available paper area. The result's Print size line lets you check the saved resolution and physical measurements before sending it to the printer.

Inserting the JPG or PNG into Word uses the file's DPI to set its initial size in centimetres. Dragging a corner afterwards changes that placement size. WebP has no standard DPI field, so choose JPG or PNG for a document or print job where the physical measurement matters.

If the form also has a KB limit

Click a Maximum button or a range button to turn off No limit and reveal the KB inputs. With fixed dimensions, JPG and WebP adjust quality without changing width or height. PNG has no quality slider; if it cannot fit at the requested dimensions, the tool reports that rather than silently resizing it.

For a 50 KB photo, see compress image to 50 KB. A download that falls short of a minimum can be raised with increase image size in KB. For a task concerned only with file weight, open reduce image size in KB.