Lumina
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Resize image

Set exact width and height. Lock aspect ratio to keep proportions.

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Give every image the dimensions its destination actually needs.

Pixel dimensions affect sharpness, layout stability, and file weight. Resize from the best source available, keep proportions locked unless distortion is intentional, and deliver only as many pixels as the final placement needs.

Set exact dimensions
Enter the width and height required by a website slot, document, or handoff.
Protect proportions
Keep the aspect ratio locked so changing one dimension updates the other naturally.
Preview before export
Check the resized PNG in the browser before saving it.

How to use Resize image

  1. 1

    Find the target size

    Check the maximum dimensions where the image will actually appear.

  2. 2

    Enter one dimension

    With the ratio locked, set width or height and let the other value follow.

  3. 3

    Inspect and download

    Look for softness or distortion, then save the PNG.

Questions people ask

What does the aspect-ratio lock do?+

It keeps width and height proportional, so changing one dimension automatically updates the other.

Can resizing make a small photo high resolution?+

It can create a larger pixel grid, but it cannot restore detail that was never captured.

What format does Resize export?+

The current resize tool exports PNG.