Pixel Calculator

Upload an image or enter dimensions. Choose a target “max side” (e.g., 4096 for DCI 4K, 3840 for UHD 4K). The calculator preserves aspect ratio and ensures neither side exceeds the chosen maximum.

1) Image & Dimensions

Click to choose an image or drop it here.

We’ll read its pixel dimensions without uploading anywhere.

Width (px)

Height (px)

Preview will appear here after selecting an image

Ratio: – Pixels: – MP: –

2) Target Max Side & Results

4K Presets

DCI 4K (4096) UHD 4K (3840) Custom

Max side (px) (≤ 4096)

Rounding

Original

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Pixels: – • MP: –

Scaled (Max 4096)

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Pixels: – • MP: – • Scale: –×

Also show: UHD 4K (3840)

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Pixels: – • MP: – • Scale: –×

Exact Ratio

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Simplified to whole numbers using GCD.

Note: We keep the aspect ratio. Using Floor guarantees the result never exceeds the max side. Reading EXIF rotation isn’t standardized across browsers; if your photo looks rotated, the extracted naturalWidth × naturalHeight may reflect that orientation.