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Photo dimension converter
One tool for every conversion: px ↔ mm ↔ cm ↔ inch at the DPI you need.
Drop a photo here, or tap to choose
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Conversions cheat sheet at 300 DPI: 1 cm = 118 px, 1 inch = 300 px, A4 (210×297 mm) = 2480×3508 px, US Letter (8.5×11") = 2550×3300 px.
At 72 DPI (legacy web): 1 cm = 28 px, 1 inch = 72 px. Modern web does not use DPI — only CSS pixels and devicePixelRatio.
The editor below works in `mm` and `px` modes. Switch between them and the dimensions stay locked at 300 DPI.
FAQ
How big is A4 in pixels?
2480×3508 px at 300 DPI, 1240×1754 at 150 DPI.
How big is US Letter in pixels?
2550×3300 px at 300 DPI.
1 cm in pixels?
118 px at 300 DPI, 28 px at 72 DPI.
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