CM to Pixels Calculator for Photos & Signatures
Convert centimetres into pixel dimensions using the resolution specified in your application instructions.
Formula and a worked example
Pixels = centimetres ÷ 2.54 × DPI. Width and height are rounded separately to the nearest whole pixel. For example, 3.5 × 4.5 cm at 300 DPI becomes approximately 413 × 531 pixels. This is a measurement example, not an exam requirement.
After checking the official specifications, use the photo and signature resizer to create a JPEG at the calculated pixel dimensions and your required KB limit. That resizer supports up to 4096 pixels per dimension and controls pixels and compression; it does not set a custom DPI metadata tag. A portal requiring specific embedded DPI metadata may require another editor.
Before you use this tool
Is DPI the same as image quality?
No. Here the entered resolution relates a physical measurement to a pixel count. A larger computed image does not restore detail missing from the original photo.
Will this change my file or its DPI metadata?
No. This calculator does not request a file. It only calculates rounded pixel dimensions; it does not embed a DPI tag or certify a photograph.
What if the notification already gives pixels?
Use its pixel dimensions directly. Do not replace an explicit pixel requirement with a rounded conversion or assume that 300 DPI applies.