Resize Image in CM Online – Convert Photo to Exact Centometres
Convert photos to exact centimetre or millimetre dimensions for passport, visa, and ID applications. No quality loss, no server uploads.Upload multiple images for batch processing. Your files never leave your device. 100% free & private.
CM to Pixels Formula
To convert centimetres to pixels, you need to know the DPI (Dots Per Inch) or PPI (Pixels Per Inch) of your target output. For high-quality printing, 300 DPI is the global standard.
The Formula:
Pixels = (CM ÷ 2.54) × DPI
(Note: 2.54 is the number of centimetres in one inch)
For example, if you need a 3.5 cm × 4.5 cm passport photo at 300 DPI:
Width: (3.5 ÷ 2.54) × 300 = 413 pixels
Height: (4.5 ÷ 2.54) × 300 = 531 pixels
Centimetre to Pixel Conversion Chart
Here is a complete cm to pixel conversion chart for common photo sizes like 3.5×4.5 cm passport photo, signature size, and more. Use this guide to find the perfect dimensions for your online forms.
| Size (CM) | Size (MM) | Pixels (300 DPI) | Common Use |
|---|---|---|---|
| 2 × 2 cm | 20 × 20 mm | 236 × 236 px | Small stamps |
| 2.5 × 3.5 cm | 25 × 35 mm | 295 × 413 px | Stamp-size photos |
| 3.5 × 4.5 cm | 35 × 45 mm | 413 × 531 px | Indian passport / visa |
| 5 × 2 cm | 50 × 20 mm | 591 × 236 px | Signature (UPSC/SSC) |
| 5.1 × 5.1 cm | 51 × 51 mm | 602 × 602 px | US passport |
| 6 × 3 cm | 60 × 30 mm | 709 × 354 px | Signature scans |
How Our CM Image Resizer Works
Traditional resizers only work with pixels. Our advanced cm photo resizer applies real-time conversion logic:
- DPI Scaling: It automatically assumes 300 DPI for print-ready results.
- Centometre to Pixel Logic: Using the standard (CM ÷ 2.54) × DPI formula.
- Aspect Ratio Locking: Ensures your photo doesn't look stretched or squashed.
Resize Image Size in CM for Different Uses
Passport Photos
Resize your photo to standard 3.5×4.5 cm or 2×2 inches for Indian and US passport applications.
Signature Scans
Commonly required as 5×2 cm or 6×3 cm for UPSC, SSC, and bank exam portals.
Visa Applications
Different countries require different cm sizes (e.g., 3.5×4.5 cm for Schengen, 2×2 inches for USA).
Exam Forms
UPSC and SSC often specify dimensions in centimetres to ensure uniformity across digital uploads.
Common Searches
Related to CM Photo Resize
- Resize image to 3.5×4.5 cm: The most common size for Indian identification.
- Convert cm to pixels for passport photo: Calculating dimensions at 300 DPI.
- Photo size in cm for SSC and UPSC: Meeting government form requirements.
Steps to Resize Photo in Centimetres
- Find your pixel equivalent: Use the chart above to convert your cm requirement to pixels at 300 DPI.
- Upload your photo: Drop the image into the tool above.
- Switch to Dimensions mode: Click the Width × Height tab.
- Enter pixel values: Type the calculated pixel dimensions.
- Download: Your photo is now compressed and resized to the exact cm size for printing.