All Products
Search

This Product

    CDN:Resize images

    Document Center

    CDN:Resize images

    Last Updated:Dec 02, 2024

    Image resizing includes resizing by percentage, conditional resizing, adaptive resizing, and resizing to a specific size. If a platform or an app has specific requirements for the size of images, such as a profile picture or thumbnail, you can resize images by dimension or percentage to meet different display requirements.

    Note

    • The image editing feature of Alibaba Cloud CDN, the image editing feature of DCDN, and the Image Processing (IMG) feature of Object Storage Service (OSS) are three different features.

    • Image editing is free of charge until further notice.

    • When you use the image editing feature, conversion between different image formats, such as JPEG to WebP, JPEG to PNG, and PNG to WebP, may result in larger image sizes. This is because different image formats use different compression algorithms. If you want to reduce image sizes, we recommend that you configure the quality parameter to reduce the image quality.

    Parameters

    Action: resize

    The following table describes the parameters.

    Note

    • If one of the preceding parameters is set to a negative value, the image remains in its original size.

    • Currently, the feature only supports decreasing the size of images. If the configuration attempts to enlarge an image, the output remains unchanged.

    Parameter

    Description

    Valid value

    w

    Specifies the width to which you want to resize the image.

    The default value is 0. The total pixels of the image cannot exceed 16,777,216 pixels.

    h

    Specifies the height to which you want to resize the image.

    l

    Specifies the length of the longer side to which you want to resize the image.

    s

    Specifies the length of the shorter side to which you want to resize the image.

    fw and fh

    Specifies the width and height to which you want to resize the image.

    p

    Specifies that the image is resized based on the original aspect ratio.

    [0,100]

    Examples

    The following table describes how to resize images.

    Feature

    Description

    Example

    Based on a specific aspect ratio

    Resize an image based on the original aspect ratio. 

    example.com/image01.png?image_process=resize,p_80

    Based on conditions

    Resize an image only if the image is greater than or equal to 1,024,000 bytes in size. Unit: bytes.

    Note

    In this example, the threshold is set to 1,024,000. You can set the threshold based on your business requirements. 

    example.com/image01.png?image_process=resize,l_200/threshold,1024000

    Based on the longer side

    Resize an image based on the specified length of the longer side. 

    example.com/image01.png?image_process=resize,l_200

    Based on the shorter side

    Resize an image based on the specified length of the shorter side. 

    example.com/image01.png?image_process=resize,s_200

    Based on the width

    Resize an image based on the specified width. 

    example.com/image01.png?image_process=resize,w_200

    Based on the height

    Resize an image based on the specified height. 

    example.com/image01.png?image_process=resize,h_200

    Based on the specified height and width

    Resize an image based on the specified height and width. 

    example.com/image01.png?image_process=resize,fw_200,fh_200