Image Resize
Calculator
Results
- Target height px
- 1,200
Media and photography results
| Target height px | 1,200 |
formula-map diagram
- Target height px
- 1,200
Media and photography relationship
Formula
h₂ = w₂ × h₁ ÷ w₁= 1200
Note
This result uses the values you entered and a simplified planning equation; verify quantities and local requirements before purchasing or building.
More in Media and photography
See all →Frequently asked questions
How does the calculator determine the new dimensions when I resize an image?+
When 'maintain aspect ratio' is used, the calculator scales both width and height by the same factor, computed from whichever dimension you changed, so the image's proportions stay identical and nothing gets stretched or squashed. Entering a new width automatically computes the matching height using width/height = original width/original height.
What happens if I don't maintain the aspect ratio?+
Setting width and height independently without locking the ratio will stretch or squash the image to fit those exact dimensions, distorting circles into ovals and faces into unnatural proportions. This is almost always undesirable except for specific effects, so most resizing workflows keep the aspect ratio locked.
Does resizing an image up (enlarging) work as well as resizing down?+
Not equally well: shrinking an image (downsampling) generally preserves quality well because you're combining existing pixel data, but enlarging an image (upsampling) requires the software to invent new pixel data that wasn't in the original, which can result in visible softness or blur beyond a certain enlargement factor. AI upscaling tools do better than simple interpolation but still can't recover truly missing detail.
Why does the file size not necessarily shrink in proportion to the pixel dimensions?+
Pixel dimensions determine total pixel count, but file size (especially for compressed formats like JPEG) also depends heavily on image complexity and compression settings, so a smaller image with lots of fine detail and noise can compress worse (relatively) than a larger, simpler image. Resizing changes pixel count directly but only indirectly influences final compressed file size.
How do I know what dimensions to target for a specific use, like a website or social media post?+
Target dimensions should match the actual display size the image will be shown at, accounting for the display's pixel density; a web image control that displays at 800px wide but is shown at 2x pixel density (retina/high-DPI) should actually be exported at 1600px wide to look sharp. Many platforms also publish specific recommended dimensions for profile photos, banners, and posts that are worth checking directly.