Sending an unedited photo straight from your phone or camera in an email is one of the most common ways to end up with a message that loads slowly, gets flagged by spam filters, or displays badly for the recipient. Here’s how to get it right.
Why email images need special treatment
Many email providers cap total message size (often around 20–25 MB), and mobile email apps load images over cellular data, meaning a heavy image slows down or frustrates recipients checking email on their phone. Some corporate email systems also strip or block unusually large attachments entirely.
Recommended dimensions for email
For images embedded directly in the body of an email, 600–650 pixels wide is a safe maximum — this fits comfortably within the display width of virtually every email client without requiring the recipient to scroll horizontally. For attachments meant to be viewed or printed rather than displayed inline, you have more flexibility, but there’s rarely a reason to exceed 1200–1600 pixels wide unless the recipient specifically needs a high-resolution file.
Recommended file size
Aim for under 200–300 KB per embedded image. A properly resized and compressed JPG at reasonable quality settings easily hits this target even for detailed photos.
Step-by-step
- Resize the image to around 600–650 px wide (or up to 1600 px if it’s an attachment for printing, not inline display).
- Save as JPG unless you specifically need transparency, in which case use PNG.
- Set compression quality to around 75–85 — a good balance for photos sent over email.
- Check the final file size before sending — if it’s still large, reduce quality slightly rather than dimensions.
A note on multiple images
If you’re sending several photos in one email, resize and compress each one individually rather than relying on your email client’s automatic compression, which is often unpredictable and sometimes disabled by default. Batch resizing multiple images at once before attaching them keeps the whole email lightweight and consistent.