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Resize Image to 3x4 cm (30x40 mm)

Create standard 30mm x 40mm photos instantly. Ideal for Brazil ID (RG), Colombia Cédula, and Japan Resume (Rirekisho). Features custom DPI and Metric conversion.

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Drag & Drop (JPG, PNG, HEIC)

Precision 3x4 cm Photo Converter

The 30mm x 40mm (3x4 cm) photo format is the definitive metric standard for identification in Latin America (Brazil, Colombia) and for professional documents in East Asia (Japan, South Korea).

Global Standards for 3x4 cm
Latin America (ID/Visa)
  • Brazil: RG (Cédula de Identidade), CNH, Carteira de Trabalho. Background must be white.
  • Colombia: Cédula de Ciudadanía. White background required.
  • Argentina & Mexico: Used for various regional permits.
Japan & East Asia
  • Japan: Resume (Rirekisho 履歴書), Zairyu Card (Residence). Plain background (Blue/White/Grey).
  • South Korea: Standard Resume Photo, Student ID cards.
  • Taiwan: Health Insurance Card (NHI).

Pixel Conversions & Technical Specs

When applying online, knowing the pixel dimensions is crucial. The physical size of 3x4 cm translates to different pixel dimensions based on the required DPI (Dots Per Inch).

DPI Quality Width (px) Height (px) Common Use
96 DPI 113 px 151 px Low-res web avatars
300 DPI 354 px 472 px Standard Print / ID
600 DPI 709 px 945 px High-quality Archival

Step-by-Step Guide

  1. Upload: Drag and drop your image into the box above. We support JPG, PNG, and HEIC (iPhone) formats.
  2. Select Preset: Choose a quick preset (e.g., "Brazil ID" or "Japan Resume") to automatically set the correct aspect ratio (3:4).
  3. Crop & Adjust: Use the crop handles to center your head. Ensure there is equal space between your ears and the borders. Align your eyes with the grid guide.
  4. Set Resolution (DPI): For printing, ensure the DPI is set to 300. This is the default setting.
  5. Download: Click the "Resize & Download" button. The tool will process your image and save it as a high-quality JPG.

Expert FAQs

What background color should I use for a Japanese Resume?

For a Japanese Resume (Rirekisho), a plain white, blue, or light grey background is acceptable. White is the safest and most formal choice. Ensure there are no shadows behind your head.

Is 3x4 cm the same as 30x40 mm?

Yes, exactly. 1 cm equals 10 mm. Different countries use different units in their official requirements, but the physical size is identical.

Can I convert inches to 3x4 cm?

3x4 cm is approximately 1.18 x 1.57 inches. It is slightly narrower than the US standard 1.5x2 inches. It is best to use the metric (cm/mm) setting for accuracy.

Why does the Brazilian RG photo require a white background?

The Brazilian "Carteira de Identidade" standards strictly require a white background to ensure high contrast for biometric facial recognition systems.