Open the picture in a photo editor or compression tool
Resize the image to smaller dimensions if needed
Choose a lower quality setting when saving as JPEG
Save in a more compressed format such as JPEG or WebP
Remove unnecessary metadata if the tool allows it
Use batch compression tools for multiple pictures
Compare file size and image quality after compression
Keep an original copy before compressing
Use online image compressors or desktop apps
Adjust compression until the file size is reduced enough