The Tool Desk
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Make an image responsive without stretching it
Apply a maximum width of 100% and let the height remain automatic:
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img {
max-width: 100%;
height: auto;
}This lets an image shrink when it is wider than its available space while preserving its natural proportions. It does not enlarge a smaller image to fill a wider container. A logical-properties equivalent is max-inline-size: 100%; block-size: auto;.
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.responsive-image {
max-width: 100%;
height: auto;
}<img class="responsive-image" src="photo.jpg" alt="Description of the image">Choose between scaling, cropping, and empty space
First decide whether the whole image must stay visible and whether the layout needs a consistent frame. If the image should simply fit the available width, the responsive rule above is usually enough. For a box with defined dimensions or a preferred ratio, choose how its contents should fit:
| CSS choice | What happens | Use it when |
|---|---|---|
object-fit: cover |
Fills the image box while preserving proportions; parts that do not fit are cropped. | You need a filled, consistent frame and cropping is acceptable. |
object-fit: contain |
Shows the complete image at its natural proportions; unused space may remain in the box. | Every part of the image must remain visible. |
object-fit: fill |
Fills the box, potentially changing the image’s proportions. | Distortion is acceptable for the particular content; it is usually unsuitable for photographs or illustrations. |
object-fit: none |
Leaves the image content unresized. | You specifically want the object to remain at its intrinsic size. |
object-fit: scale-down |
Uses whichever is smaller: the result of none or contain. |
You want to avoid enlarging the object while allowing it to shrink to fit. |
Crop images to a consistent frame
Set the box dimensions or a preferred aspect ratio, then use object-fit to control how the image sits inside it. For a full-width landscape thumbnail:
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.thumbnail {
width: 100%;
aspect-ratio: 16 / 9;
object-fit: cover;
object-position: center;
}object-position controls which area remains visible in a crop. For example, use object-position: top center; when the important subject is near the top. With cover, some content outside the frame will be clipped. Replace it with contain if the complete image must be visible, and allow for empty space around it.
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An aspect-ratio sets a preferred shape for the box. At least one box dimension needs to remain automatic for that preferred ratio to affect sizing. Pair a chosen box ratio with object-fit so the image content is not stretched to match the frame.
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Reserve space before an image loads
When the image’s intrinsic dimensions are known, include its width and height attributes in the HTML. The browser can use those values to calculate the aspect ratio before the image finishes loading. Responsive CSS can still change its rendered size while the ratio information helps establish the space it needs.
<img
src="photo.jpg"
alt="Description of the image"
width="1200"
height="800"
class="responsive-image"
>The attribute values should describe the image’s actual intrinsic dimensions, not the desired CSS display size.
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Common problems and fixes
- The image overflows its container: Apply
max-width: 100%to the image and check that another CSS rule is not overriding it. - The image looks stretched: Avoid forcing both rendered dimensions to values that conflict with the image’s natural ratio. Use an automatic second dimension for natural scaling, or use a frame with
object-fit: coverorcontain. - The whole subject does not fit in a thumbnail:
covercrops by design. Change tocontainto show the full image, or adjustobject-positionto shift the visible crop. - There is blank space in the frame: That can be expected with
contain, which prioritizes showing the whole image. Usecoverif filling the frame matters more than preserving every edge. - An image is unexpectedly enlarged or not enlarged:
max-width: 100%prevents overflow but does not enlarge a naturally smaller image. Set an explicit width if enlargement is intentional, and retain an automatic height to preserve proportions.
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Frequently Asked Questions
Does max-width: 100% enlarge a small image?
No. It limits the image’s width to its available space; it does not by itself scale a smaller image up.
Can I preserve the whole image and still fill a fixed-ratio frame?
Not when the image and frame have different ratios without either cropping, leaving unused space, or distorting the image. Choose cover, contain, or a matching frame ratio based on which trade-off is acceptable.
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