Email attachments have limits that catch people off guard constantly — a photo straight from a modern camera can be large enough to bounce an email entirely, or to sit for a frustratingly long time in someone's inbox before it finishes downloading.
Know the practical size limits
Most email providers cap total attachment size well under what a handful of full-resolution photos would add up to. Even under that hard limit, very large attachments are slow to send and slow for the recipient to download, especially on mobile connections.
Picking the right format
JPG is almost always the right choice for photos being emailed — it compresses well and is universally supported by every email client. PNG should be reserved for screenshots or graphics where sharp text or transparency actually matters, since it produces much larger files for photographic content.
A quick pre-send checklist
- Resize the image to a reasonable dimension — full print resolution is rarely needed for something viewed on a screen.
- Compress to a moderate quality setting; the difference is usually invisible in an email preview.
- Combine multiple images into a single PDF if you are sending more than a couple, which is often easier for the recipient than several separate attachments.
- Check the total attachment size against your email provider's limit before hitting send.
Why this is worth the extra minute
A well-sized attachment sends instantly and opens instantly for the recipient. An oversized one risks bouncing entirely, silently failing to send, or leaving your recipient waiting — all for the sake of resolution nobody asked for.
Shrink an image before you attach it.
Open Compress Image