Creative Tools
Image Resize Calculator
Enter original size and a target width or height to get the other dimension.
Resize without stretching
Scaling an image for the web without stretching means preserving aspect ratio: when you set a new width, height becomes original height × (new width ÷ original width), and the reverse when height is the constraint. If both a maximum width and height are set, the tool fits inside that box by using the tighter scale so nothing is cropped by the maths alone. This page only computes pixel dimensions — it does not resample or export a file. For print, pair the result with resolution tools so centimetres and dots per inch (DPI) still look sharp. Use the DPI calculator and print size tools when physical output matters.
Worked example
A 1920 × 1080 image scaled to 800 px wide becomes 800 × 450 (scale 41.7%, aspect 16:9).
Limits and assumptions
Pixel arithmetic only. Upscaling cannot invent detail; use a proper image editor to resample.
Frequently asked questions
What if I enter both target width and height?
The calculator scales uniformly to fit inside both limits without distorting — equivalent to “fit” rather than “fill/crop”.
What does aspect ratio mean here?
The width:height relationship (for example 16:9). Locking it stops the image looking stretched.
Is upscaling a good idea?
Mathematically yes; visually, soft or blocky results are common unless you use specialised upscalers.
How do retina or 2× displays change targets?
Provide about twice the CSS pixel width in raw pixels if you want crisp display on 2× screens.