You may use free image editing software

Gimp:  https://www.gimp.org/downloads/

 

Step 1: There are 2 ways where you can open the image that you want to edit.

 

  1. Go to “File” and choose “Open”

 

  1. You may drag and drop the image

 

 

Step 2:  Go to “Image” > choose “Scale Image” form the drop-down list. 

 

 


Step 3: Enter the width and height to set your desired dimensions. Interpolation to remain as cubic. Once done click “Scale”.

 

 

Step 4: Once the size is set, go to File > “Export As… “ to save the edited file. 

 

 

Step 5: A pop up will appear for you to rename/add image format and also where you want to save the picture in your pc. 


Image format : 


- .jpeg , .jpg for non-transparent background

- .png for transparent background


Once you have edit the details, click “Export”

 



Step 6: Once you click export, another pop up will appear

  1. Select “Show preview in image window”, once you select , you will see the “File size“. All images should be lesser than 250kb. 
  2. If the image is more than 250kb, use the Quality option to adjust the file size to be lesser 250kb.

*adjust accordingly so that the quality won’t drop

 

Step 7: Click “Export “