What Image File Size Is Best for Email?
There is no single universal limit. A practical target is to keep images small enough for fast loading and to respect the recipient’s or mail service’s attachment limits.
What to do
If you are embedding an image in an email, resize it to the display dimensions and compress it. If you are sending the original as an attachment, check the mail service’s current attachment limit. The simplest next step is to Compress Image. If the issue is actually about resize image, see Resize Image as well.
Why this happens
Image problems often come from three separate variables: pixel dimensions, encoded file size and file format. Changing one does not automatically solve the others. A very large photo may need resizing even when its format is already JPG; a transparent graphic may need PNG or WebP even when the file size is acceptable; and an upload limit may be measured in megabytes rather than pixels.
Before editing, check the requirements of the place where the image will be used. That gives you a concrete target and reduces unnecessary quality loss. When possible, keep the original file and create a delivery copy for the specific destination.
Common questions
Should I send the original photo?
Only when the recipient needs the original quality. For ordinary viewing, a smaller delivery copy is usually easier to send and download.
Is JPG good for email photos?
Usually, yes. JPG is widely supported and efficient for photographic images.
Should I use PNG for a photo attachment?
Usually not unless you specifically need its lossless characteristics or transparency.